Fossil

    "  ancestor(rid, mtime) AS ("
    "    SELECT %d, mtime FROM event WHERE objid=%d "
    "    UNION "
    "    SELECT plink.pid, event.mtime"
    "      FROM ancestor, plink, event"
    "     WHERE plink.cid=ancestor.rid"
    "       AND event.objid=plink.pid %s"
    "     ORDER BY mtime DESC LIMIT %d"
    "  )"
    "INSERT INTO ok"
    "  SELECT rid FROM ancestor;",


    rid, rid, directOnly ? "AND plink.isPrim" : "", N
  );
}

/*
** Compute up to N direct ancestors (merge ancestors do not count)
** for the check-in rid and put them in a table named "ancestor".
** Label each generation with consecutive integers going backwards

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.8.3"
#define SQLITE_VERSION_NUMBER 3008003
#define SQLITE_SOURCE_ID      "2014-01-22 18:16:27 b6cea42006910d590373e8f9e296d7672edb114b"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros

#define TK_FUNCTION                       153
#define TK_COLUMN                         154
#define TK_AGG_FUNCTION                   155
#define TK_AGG_COLUMN                     156
#define TK_UMINUS                         157
#define TK_UPLUS                          158
#define TK_REGISTER                       159


/************** End of parse.h ***********************************************/
/************** Continuing where we left off in sqliteInt.h ******************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#define OP_ReadCookie     47
#define OP_SetCookie      48
#define OP_VerifyCookie   49
#define OP_OpenRead       50 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenWrite      51 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenAutoindex  52 /* synopsis: nColumn=P2                       */
#define OP_OpenEphemeral  53 /* synopsis: nColumn=P2                       */

#define OP_SorterOpen     54
#define OP_OpenPseudo     55 /* synopsis: content in r[P2@P3]              */
#define OP_Close          56
#define OP_SeekLt         57 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekLe         58 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekGe         59 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekGt         60 /* synopsis: key=r[P3@P4]                     */
#define OP_Seek           61 /* synopsis: intkey=r[P2]                     */
#define OP_NoConflict     62 /* synopsis: key=r[P3@P4]                     */
#define OP_NotFound       63 /* synopsis: key=r[P3@P4]                     */
#define OP_Found          64 /* synopsis: key=r[P3@P4]                     */
#define OP_NotExists      65 /* synopsis: intkey=r[P3]                     */
#define OP_Sequence       66 /* synopsis: r[P2]=rowid                      */
#define OP_NewRowid       67 /* synopsis: r[P2]=rowid                      */
#define OP_Insert         68 /* synopsis: intkey=r[P3] data=r[P2]          */
#define OP_InsertInt      69 /* synopsis: intkey=P3 data=r[P2]             */
#define OP_Delete         70
#define OP_Or             71 /* same as TK_OR, synopsis: r[P3]=(r[P1] || r[P2]) */
#define OP_And            72 /* same as TK_AND, synopsis: r[P3]=(r[P1] && r[P2]) */

#define OP_ResetCount     73
#define OP_SorterCompare  74 /* synopsis: if key(P1)!=rtrim(r[P3],P4) goto P2 */
#define OP_SorterData     75 /* synopsis: r[P2]=data                       */
#define OP_IsNull         76 /* same as TK_ISNULL, synopsis: if r[P1]==NULL goto P2 */
#define OP_NotNull        77 /* same as TK_NOTNULL, synopsis: if r[P1]!=NULL goto P2 */
#define OP_Ne             78 /* same as TK_NE, synopsis: if r[P1]!=r[P3] goto P2 */
#define OP_Eq             79 /* same as TK_EQ, synopsis: if r[P1]==r[P3] goto P2 */
#define OP_Gt             80 /* same as TK_GT, synopsis: if r[P1]>r[P3] goto P2 */
#define OP_Le             81 /* same as TK_LE, synopsis: if r[P1]<=r[P3] goto P2 */
#define OP_Lt             82 /* same as TK_LT, synopsis: if r[P1]<r[P3] goto P2 */
#define OP_Ge             83 /* same as TK_GE, synopsis: if r[P1]>=r[P3] goto P2 */
#define OP_RowKey         84 /* synopsis: r[P2]=key                        */
#define OP_BitAnd         85 /* same as TK_BITAND, synopsis: r[P3]=r[P1]&r[P2] */
#define OP_BitOr          86 /* same as TK_BITOR, synopsis: r[P3]=r[P1]|r[P2] */
#define OP_ShiftLeft      87 /* same as TK_LSHIFT, synopsis: r[P3]=r[P2]<<r[P1] */
#define OP_ShiftRight     88 /* same as TK_RSHIFT, synopsis: r[P3]=r[P2]>>r[P1] */
#define OP_Add            89 /* same as TK_PLUS, synopsis: r[P3]=r[P1]+r[P2] */
#define OP_Subtract       90 /* same as TK_MINUS, synopsis: r[P3]=r[P2]-r[P1] */
#define OP_Multiply       91 /* same as TK_STAR, synopsis: r[P3]=r[P1]*r[P2] */
#define OP_Divide         92 /* same as TK_SLASH, synopsis: r[P3]=r[P2]/r[P1] */
#define OP_Remainder      93 /* same as TK_REM, synopsis: r[P3]=r[P2]%r[P1] */
#define OP_Concat         94 /* same as TK_CONCAT, synopsis: r[P3]=r[P2]+r[P1] */
#define OP_RowData        95 /* synopsis: r[P2]=data                       */
#define OP_BitNot         96 /* same as TK_BITNOT, synopsis: r[P1]= ~r[P1] */
#define OP_String8        97 /* same as TK_STRING, synopsis: r[P2]='P4'    */

#define OP_Rowid          98 /* synopsis: r[P2]=rowid                      */
#define OP_NullRow        99
#define OP_Last          100
#define OP_SorterSort    101
#define OP_Sort          102
#define OP_Rewind        103
#define OP_SorterInsert  104
#define OP_IdxInsert     105 /* synopsis: key=r[P2]                        */
#define OP_IdxDelete     106 /* synopsis: key=r[P2@P3]                     */
#define OP_IdxRowid      107 /* synopsis: r[P2]=rowid                      */
#define OP_IdxLT         108 /* synopsis: key=r[P3@P4]                     */
#define OP_IdxGE         109 /* synopsis: key=r[P3@P4]                     */
#define OP_Destroy       110
#define OP_Clear         111
#define OP_CreateIndex   112 /* synopsis: r[P2]=root iDb=P1                */
#define OP_CreateTable   113 /* synopsis: r[P2]=root iDb=P1                */
#define OP_ParseSchema   114
#define OP_LoadAnalysis  115
#define OP_DropTable     116
#define OP_DropIndex     117
#define OP_DropTrigger   118
#define OP_IntegrityCk   119
#define OP_RowSetAdd     120 /* synopsis: rowset(P1)=r[P2]                 */
#define OP_RowSetRead    121 /* synopsis: r[P3]=rowset(P1)                 */
#define OP_RowSetTest    122 /* synopsis: if r[P3] in rowset(P1) goto P2   */
#define OP_Program       123
#define OP_Param         124
#define OP_FkCounter     125 /* synopsis: fkctr[P1]+=P2                    */
#define OP_FkIfZero      126 /* synopsis: if fkctr[P1]==0 goto P2          */
#define OP_MemMax        127 /* synopsis: r[P1]=max(r[P1],r[P2])           */
#define OP_IfPos         128 /* synopsis: if r[P1]>0 goto P2               */
#define OP_IfNeg         129 /* synopsis: if r[P1]<0 goto P2               */
#define OP_IfZero        130 /* synopsis: r[P1]+=P3, if r[P1]==0 goto P2   */
#define OP_AggFinal      131 /* synopsis: accum=r[P1] N=P2                 */
#define OP_IncrVacuum    132
#define OP_Real          133 /* same as TK_FLOAT, synopsis: r[P2]=P4       */

#define OP_Expire        134
#define OP_TableLock     135 /* synopsis: iDb=P1 root=P2 write=P3          */
#define OP_VBegin        136
#define OP_VCreate       137
#define OP_VDestroy      138
#define OP_VOpen         139
#define OP_VColumn       140 /* synopsis: r[P3]=vcolumn(P2)                */
#define OP_VNext         141
#define OP_VRename       142
#define OP_ToText        143 /* same as TK_TO_TEXT                         */
#define OP_ToBlob        144 /* same as TK_TO_BLOB                         */
#define OP_ToNumeric     145 /* same as TK_TO_NUMERIC                      */
#define OP_ToInt         146 /* same as TK_TO_INT                          */
#define OP_ToReal        147 /* same as TK_TO_REAL                         */

#define OP_Pagecount     148
#define OP_MaxPgcnt      149
#define OP_Trace         150
#define OP_Noop          151
#define OP_Explain       152


/* Properties such as "out2" or "jump" that are specified in
** comments following the "case" for each opcode in the vdbe.c
** are encoded into bitvectors as follows:
*/
#define OPFLG_JUMP            0x0001  /* jump:  P2 holds jmp target */

/*   0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,\
/*   8 */ 0x01, 0x01, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00,\
/*  16 */ 0x01, 0x01, 0x04, 0x24, 0x04, 0x10, 0x00, 0x02,\
/*  24 */ 0x02, 0x02, 0x02, 0x02, 0x02, 0x00, 0x00, 0x20,\
/*  32 */ 0x00, 0x00, 0x04, 0x05, 0x04, 0x00, 0x00, 0x01,\
/*  40 */ 0x01, 0x05, 0x05, 0x00, 0x00, 0x00, 0x02, 0x02,\
/*  48 */ 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
/*  56 */ 0x00, 0x11, 0x11, 0x11, 0x11, 0x08, 0x11, 0x11,\
/*  64 */ 0x11, 0x11, 0x02, 0x02, 0x00, 0x00, 0x00, 0x4c,\
/*  72 */ 0x4c, 0x00, 0x00, 0x00, 0x05, 0x05, 0x15, 0x15,\
/*  80 */ 0x15, 0x15, 0x15, 0x15, 0x00, 0x4c, 0x4c, 0x4c,\
/*  88 */ 0x4c, 0x4c, 0x4c, 0x4c, 0x4c, 0x4c, 0x4c, 0x00,\
/*  96 */ 0x24, 0x02, 0x02, 0x00, 0x01, 0x01, 0x01, 0x01,\
/* 104 */ 0x08, 0x08, 0x00, 0x02, 0x01, 0x01, 0x02, 0x00,\
/* 112 */ 0x02, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
/* 120 */ 0x0c, 0x45, 0x15, 0x01, 0x02, 0x00, 0x01, 0x08,\
/* 128 */ 0x05, 0x05, 0x05, 0x00, 0x01, 0x02, 0x00, 0x00,\
/* 136 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x04,\
/* 144 */ 0x04, 0x04, 0x04, 0x04, 0x02, 0x02, 0x00, 0x00,\
/* 152 */ 0x00,}

/************** End of opcodes.h *********************************************/
/************** Continuing where we left off in vdbe.h ***********************/

/*
** Prototypes for the VDBE interface.  See comments on the implementation
** for a description of what each of these routines does.

** Allowed values for the NameContext, ncFlags field.
*/
#define NC_AllowAgg  0x01    /* Aggregate functions are allowed here */
#define NC_HasAgg    0x02    /* One or more aggregate functions seen */
#define NC_IsCheck   0x04    /* True if resolving names in a CHECK constraint */
#define NC_InAggFunc 0x08    /* True if analyzing arguments to an agg func */
#define NC_PartIdx   0x10    /* True if resolving a partial index WHERE */



/*
** An instance of the following structure contains all information
** needed to generate code for a single SELECT statement.
**
** nLimit is set to -1 if there is no LIMIT clause.  nOffset is set to 0.
** If there is a LIMIT clause, the parser sets nLimit to the value of the

#define SF_HasTypeInfo     0x0020  /* FROM subqueries have Table metadata */
#define SF_UseSorter       0x0040  /* Sort using a sorter */
#define SF_Values          0x0080  /* Synthesized from VALUES clause */
#define SF_Materialize     0x0100  /* Force materialization of views */
#define SF_NestedFrom      0x0200  /* Part of a parenthesized FROM clause */
#define SF_MaybeConvert    0x0400  /* Need convertCompoundSelectToSubquery() */
#define SF_Recursive       0x0800  /* The recursive part of a recursive CTE */



/*
** The results of a SELECT can be distributed in several ways, as defined
** by one of the following macros.  The "SRT" prefix means "SELECT Result
** Type".
**
**     SRT_Union       Store results as a key in a temporary index 
**                     identified by pDest->iSDParm.
**
**     SRT_Except      Remove results from the temporary index pDest->iSDParm.
**
**     SRT_Exists      Store a 1 in memory cell pDest->iSDParm if the result
**                     set is not empty.
**
**     SRT_Discard     Throw the results away.  This is used by SELECT
**                     statements within triggers whose only purpose is
**                     the side-effects of functions.
**
** All of the above are free to ignore their ORDER BY clause. Those that
** follow must honor the ORDER BY clause.
**
**     SRT_Output      Generate a row of output (using the OP_ResultRow
**                     opcode) for each row in the result set.
**
**     SRT_Mem         Only valid if the result is a single column.
**                     Store the first column of the first result row
**                     in register pDest->iSDParm then abandon the rest
**                     of the query.  This destination implies "LIMIT 1".
**
**     SRT_Set         The result must be a single column.  Store each
**                     row of result as the key in table pDest->iSDParm. 
**                     Apply the affinity pDest->affSdst before storing
**                     results.  Used to implement "IN (SELECT ...)".
**
**     SRT_EphemTab    Create an temporary table pDest->iSDParm and store
**                     the result there. The cursor is left open after
**                     returning.  This is like SRT_Table except that
**                     this destination uses OP_OpenEphemeral to create
**                     the table first.
**
**     SRT_Coroutine   Generate a co-routine that returns a new row of
**                     results each time it is invoked.  The entry point
**                     of the co-routine is stored in register pDest->iSDParm
**                     and the result row is stored in pDest->nDest registers
**                     starting with pDest->iSdst.
**
**     SRT_Table       Store results in temporary table pDest->iSDParm.
**                     This is like SRT_EphemTab except that the table
**                     is assumed to already be open.
**
**     SRT_DistTable   Store results in a temporary table pDest->iSDParm.
**                     But also use temporary table pDest->iSDParm+1 as
**                     a record of all prior results and ignore any duplicate
**                     rows.  Name means:  "Distinct Table".
**
**     SRT_Queue       Store results in priority queue pDest->iSDParm (really
**                     an index).  Append a sequence number so that all entries
**                     are distinct.
**
**     SRT_DistQueue   Store results in priority queue pDest->iSDParm only if
**                     the same record has never been stored before.  The
**                     index at pDest->iSDParm+1 hold all prior stores.
*/
#define SRT_Union        1  /* Store result as keys in an index */
#define SRT_Except       2  /* Remove result from a UNION index */
#define SRT_Exists       3  /* Store 1 if the result is not empty */
#define SRT_Discard      4  /* Do not save the results anywhere */

/* The ORDER BY clause is ignored for all of the above */
#define IgnorableOrderby(X) ((X->eDest)<=SRT_Discard)

#define SRT_Output       5  /* Output each row of result */
#define SRT_Mem          6  /* Store result in a memory cell */
#define SRT_Set          7  /* Store results as keys in an index */

#define SRT_EphemTab     8  /* Create transient tab and store like SRT_Table */
#define SRT_Coroutine    9  /* Generate a single row of result */
#define SRT_Table       10  /* Store result as data with an automatic rowid */
#define SRT_DistTable   11  /* Like SRT_Table, but unique results only */
#define SRT_Queue       12  /* Store result in an queue */
#define SRT_DistQueue   13  /* Like SRT_Queue, but unique results only */

/*
** An instance of this object describes where to put of the results of
** a SELECT statement.
*/
struct SelectDest {
  u8 eDest;            /* How to dispose of the results.  On of SRT_* above. */
  char affSdst;        /* Affinity used when eDest==SRT_Set */
  int iSDParm;         /* A parameter used by the eDest disposal method */
  int iSdst;           /* Base register where results are written */
  int nSdst;           /* Number of registers allocated */
  ExprList *pOrderBy;  /* Key columns for SRT_Queue and SRT_DistQueue */
};

/*
** During code generation of statements that do inserts into AUTOINCREMENT 
** tables, the following information is attached to the Table.u.autoInc.p
** pointer of each autoincrement table to record some side information that
** the code generator needs.  We have to keep per-table autoincrement

#ifndef SQLITE_OMIT_VIRTUALTABLE
  Token sArg;               /* Complete text of a module argument */
  Table **apVtabLock;       /* Pointer to virtual tables needing locking */
#endif
  Table *pZombieTab;        /* List of Table objects to delete after code gen */
  TriggerPrg *pTriggerPrg;  /* Linked list of coded triggers */
  With *pWith;              /* Current WITH clause, or NULL */

  u8 bFreeWith;             /* True if pWith should be freed with parser */
};

/*
** Return true if currently inside an sqlite3_declare_vtab() call.
*/
#ifdef SQLITE_OMIT_VIRTUALTABLE

     /*  47 */ "ReadCookie"       OpHelp(""),
     /*  48 */ "SetCookie"        OpHelp(""),
     /*  49 */ "VerifyCookie"     OpHelp(""),
     /*  50 */ "OpenRead"         OpHelp("root=P2 iDb=P3"),
     /*  51 */ "OpenWrite"        OpHelp("root=P2 iDb=P3"),
     /*  52 */ "OpenAutoindex"    OpHelp("nColumn=P2"),
     /*  53 */ "OpenEphemeral"    OpHelp("nColumn=P2"),

     /*  54 */ "SorterOpen"       OpHelp(""),
     /*  55 */ "OpenPseudo"       OpHelp("content in r[P2@P3]"),
     /*  56 */ "Close"            OpHelp(""),
     /*  57 */ "SeekLt"           OpHelp("key=r[P3@P4]"),
     /*  58 */ "SeekLe"           OpHelp("key=r[P3@P4]"),
     /*  59 */ "SeekGe"           OpHelp("key=r[P3@P4]"),
     /*  60 */ "SeekGt"           OpHelp("key=r[P3@P4]"),
     /*  61 */ "Seek"             OpHelp("intkey=r[P2]"),
     /*  62 */ "NoConflict"       OpHelp("key=r[P3@P4]"),
     /*  63 */ "NotFound"         OpHelp("key=r[P3@P4]"),
     /*  64 */ "Found"            OpHelp("key=r[P3@P4]"),
     /*  65 */ "NotExists"        OpHelp("intkey=r[P3]"),
     /*  66 */ "Sequence"         OpHelp("r[P2]=rowid"),
     /*  67 */ "NewRowid"         OpHelp("r[P2]=rowid"),
     /*  68 */ "Insert"           OpHelp("intkey=r[P3] data=r[P2]"),
     /*  69 */ "InsertInt"        OpHelp("intkey=P3 data=r[P2]"),
     /*  70 */ "Delete"           OpHelp(""),
     /*  71 */ "Or"               OpHelp("r[P3]=(r[P1] || r[P2])"),
     /*  72 */ "And"              OpHelp("r[P3]=(r[P1] && r[P2])"),

     /*  73 */ "ResetCount"       OpHelp(""),
     /*  74 */ "SorterCompare"    OpHelp("if key(P1)!=rtrim(r[P3],P4) goto P2"),
     /*  75 */ "SorterData"       OpHelp("r[P2]=data"),
     /*  76 */ "IsNull"           OpHelp("if r[P1]==NULL goto P2"),
     /*  77 */ "NotNull"          OpHelp("if r[P1]!=NULL goto P2"),
     /*  78 */ "Ne"               OpHelp("if r[P1]!=r[P3] goto P2"),
     /*  79 */ "Eq"               OpHelp("if r[P1]==r[P3] goto P2"),
     /*  80 */ "Gt"               OpHelp("if r[P1]>r[P3] goto P2"),
     /*  81 */ "Le"               OpHelp("if r[P1]<=r[P3] goto P2"),
     /*  82 */ "Lt"               OpHelp("if r[P1]<r[P3] goto P2"),
     /*  83 */ "Ge"               OpHelp("if r[P1]>=r[P3] goto P2"),
     /*  84 */ "RowKey"           OpHelp("r[P2]=key"),
     /*  85 */ "BitAnd"           OpHelp("r[P3]=r[P1]&r[P2]"),
     /*  86 */ "BitOr"            OpHelp("r[P3]=r[P1]|r[P2]"),
     /*  87 */ "ShiftLeft"        OpHelp("r[P3]=r[P2]<<r[P1]"),
     /*  88 */ "ShiftRight"       OpHelp("r[P3]=r[P2]>>r[P1]"),
     /*  89 */ "Add"              OpHelp("r[P3]=r[P1]+r[P2]"),
     /*  90 */ "Subtract"         OpHelp("r[P3]=r[P2]-r[P1]"),
     /*  91 */ "Multiply"         OpHelp("r[P3]=r[P1]*r[P2]"),
     /*  92 */ "Divide"           OpHelp("r[P3]=r[P2]/r[P1]"),
     /*  93 */ "Remainder"        OpHelp("r[P3]=r[P2]%r[P1]"),
     /*  94 */ "Concat"           OpHelp("r[P3]=r[P2]+r[P1]"),
     /*  95 */ "RowData"          OpHelp("r[P2]=data"),
     /*  96 */ "BitNot"           OpHelp("r[P1]= ~r[P1]"),
     /*  97 */ "String8"          OpHelp("r[P2]='P4'"),

     /*  98 */ "Rowid"            OpHelp("r[P2]=rowid"),
     /*  99 */ "NullRow"          OpHelp(""),
     /* 100 */ "Last"             OpHelp(""),
     /* 101 */ "SorterSort"       OpHelp(""),
     /* 102 */ "Sort"             OpHelp(""),
     /* 103 */ "Rewind"           OpHelp(""),
     /* 104 */ "SorterInsert"     OpHelp(""),
     /* 105 */ "IdxInsert"        OpHelp("key=r[P2]"),
     /* 106 */ "IdxDelete"        OpHelp("key=r[P2@P3]"),
     /* 107 */ "IdxRowid"         OpHelp("r[P2]=rowid"),
     /* 108 */ "IdxLT"            OpHelp("key=r[P3@P4]"),
     /* 109 */ "IdxGE"            OpHelp("key=r[P3@P4]"),
     /* 110 */ "Destroy"          OpHelp(""),
     /* 111 */ "Clear"            OpHelp(""),
     /* 112 */ "CreateIndex"      OpHelp("r[P2]=root iDb=P1"),
     /* 113 */ "CreateTable"      OpHelp("r[P2]=root iDb=P1"),
     /* 114 */ "ParseSchema"      OpHelp(""),
     /* 115 */ "LoadAnalysis"     OpHelp(""),
     /* 116 */ "DropTable"        OpHelp(""),
     /* 117 */ "DropIndex"        OpHelp(""),
     /* 118 */ "DropTrigger"      OpHelp(""),
     /* 119 */ "IntegrityCk"      OpHelp(""),
     /* 120 */ "RowSetAdd"        OpHelp("rowset(P1)=r[P2]"),
     /* 121 */ "RowSetRead"       OpHelp("r[P3]=rowset(P1)"),
     /* 122 */ "RowSetTest"       OpHelp("if r[P3] in rowset(P1) goto P2"),
     /* 123 */ "Program"          OpHelp(""),
     /* 124 */ "Param"            OpHelp(""),
     /* 125 */ "FkCounter"        OpHelp("fkctr[P1]+=P2"),
     /* 126 */ "FkIfZero"         OpHelp("if fkctr[P1]==0 goto P2"),
     /* 127 */ "MemMax"           OpHelp("r[P1]=max(r[P1],r[P2])"),
     /* 128 */ "IfPos"            OpHelp("if r[P1]>0 goto P2"),
     /* 129 */ "IfNeg"            OpHelp("if r[P1]<0 goto P2"),
     /* 130 */ "IfZero"           OpHelp("r[P1]+=P3, if r[P1]==0 goto P2"),
     /* 131 */ "AggFinal"         OpHelp("accum=r[P1] N=P2"),
     /* 132 */ "IncrVacuum"       OpHelp(""),
     /* 133 */ "Real"             OpHelp("r[P2]=P4"),

     /* 134 */ "Expire"           OpHelp(""),
     /* 135 */ "TableLock"        OpHelp("iDb=P1 root=P2 write=P3"),
     /* 136 */ "VBegin"           OpHelp(""),
     /* 137 */ "VCreate"          OpHelp(""),
     /* 138 */ "VDestroy"         OpHelp(""),
     /* 139 */ "VOpen"            OpHelp(""),
     /* 140 */ "VColumn"          OpHelp("r[P3]=vcolumn(P2)"),
     /* 141 */ "VNext"            OpHelp(""),
     /* 142 */ "VRename"          OpHelp(""),
     /* 143 */ "ToText"           OpHelp(""),
     /* 144 */ "ToBlob"           OpHelp(""),
     /* 145 */ "ToNumeric"        OpHelp(""),
     /* 146 */ "ToInt"            OpHelp(""),
     /* 147 */ "ToReal"           OpHelp(""),

     /* 148 */ "Pagecount"        OpHelp(""),
     /* 149 */ "MaxPgcnt"         OpHelp(""),
     /* 150 */ "Trace"            OpHelp(""),
     /* 151 */ "Noop"             OpHelp(""),
     /* 152 */ "Explain"          OpHelp(""),
  };
  return azName[i];
}
#endif

/************** End of opcodes.c *********************************************/
/************** Begin file os_unix.c *****************************************/

      pCx->isTable = 1;
    }
  }
  pCx->isOrdered = (pOp->p5!=BTREE_UNORDERED);
  break;
}




























/* Opcode: SorterOpen P1 * * P4 *
**
** This opcode works like OP_OpenEphemeral except that it opens
** a transient index that is specifically designed to sort large
** tables using an external merge-sort algorithm.
*/
case OP_SorterOpen: {

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );
  pC->nullRow = 1;
  pC->rowidIsValid = 0;
  pC->cacheStatus = CACHE_STALE;

  if( pC->pCursor ){
    sqlite3BtreeClearCursor(pC->pCursor);
  }
  break;
}

/* Opcode: Last P1 P2 * * *

  int cntTab = 0;                   /* Number of matching table names */
  int nSubquery = 0;                /* How many levels of subquery */
  sqlite3 *db = pParse->db;         /* The database connection */
  struct SrcList_item *pItem;       /* Use for looping over pSrcList items */
  struct SrcList_item *pMatch = 0;  /* The matching pSrcList item */
  NameContext *pTopNC = pNC;        /* First namecontext in the list */
  Schema *pSchema = 0;              /* Schema of the expression */
  int isTrigger = 0;                /* True if resolved to a trigger column */
  Table *pTab = 0;                  /* Table hold the row */
  Column *pCol;                     /* A column of pTab */

  assert( pNC );     /* the name context cannot be NULL. */
  assert( zCol );    /* The Z in X.Y.Z cannot be NULL */
  assert( !ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced) );

  }

  /* Start at the inner-most context and move outward until a match is found */
  while( pNC && cnt==0 ){
    ExprList *pEList;
    SrcList *pSrcList = pNC->pSrcList;

















    if( pSrcList ){
      for(i=0, pItem=pSrcList->a; i<pSrcList->nSrc; i++, pItem++){
        pTab = pItem->pTab;
        assert( pTab!=0 && pTab->zName!=0 );
        assert( pTab->nCol>0 );
        if( pItem->pSelect && (pItem->pSelect->selFlags & SF_NestedFrom)!=0 ){
          int hit = 0;

          }else{
            testcase( iCol==31 );
            testcase( iCol==32 );
            pParse->newmask |= (iCol>=32 ? 0xffffffff : (((u32)1)<<iCol));
          }
          pExpr->iColumn = (i16)iCol;
          pExpr->pTab = pTab;
          isTrigger = 1;
        }
      }
    }
#endif /* !defined(SQLITE_OMIT_TRIGGER) */

    /*
    ** Perhaps the name is a reference to the ROWID

  /* Clean up and return
  */
  sqlite3ExprDelete(db, pExpr->pLeft);
  pExpr->pLeft = 0;
  sqlite3ExprDelete(db, pExpr->pRight);
  pExpr->pRight = 0;
  pExpr->op = (isTrigger ? TK_TRIGGER : TK_COLUMN);
lookupname_end:
  if( cnt==1 ){
    assert( pNC!=0 );
    if( pExpr->op!=TK_AS ){
      sqlite3AuthRead(pParse, pExpr, pSchema, pNC->pSrcList);
    }
    /* Increment the nRef value on all name contexts from TopNC up to
    ** the point where the name matched. */
    for(;;){
      assert( pTopNC!=0 );
      pTopNC->nRef++;

      }
    }
  
    /* Set up the local name-context to pass to sqlite3ResolveExprNames() to
    ** resolve the result-set expression list.
    */
    sNC.ncFlags = NC_AllowAgg;

    sNC.pSrcList = p->pSrc;
    sNC.pNext = pOuterNC;
  
    /* Resolve names in the result set. */
    pEList = p->pEList;
    assert( pEList!=0 );
    for(i=0; i<pEList->nExpr; i++){

        if( ExprHasProperty(pItem->pExpr, EP_Agg) ){
          sqlite3ErrorMsg(pParse, "aggregate functions are not allowed in "
              "the GROUP BY clause");
          return WRC_Abort;
        }
      }
    }





    /* Advance to the next term of the compound
    */
    p = p->pPrior;
    nCompound++;
  }

        }
      }
      inReg = sqlite3ExprCodeGetColumn(pParse, pExpr->pTab,
                               pExpr->iColumn, iTab, target,
                               pExpr->op2);
      break;
    }






    case TK_INTEGER: {
      codeInteger(pParse, pExpr, 0, target);
      break;
    }
#ifndef SQLITE_OMIT_FLOATING_POINT
    case TK_FLOAT: {
      assert( !ExprHasProperty(pExpr, EP_IntValue) );

** VDBE program, in order to factor it out of the evaluation loop.
*/
SQLITE_PRIVATE int sqlite3ExprCodeTemp(Parse *pParse, Expr *pExpr, int *pReg){
  int r2;
  pExpr = sqlite3ExprSkipCollate(pExpr);
  if( ConstFactorOk(pParse)
   && pExpr->op!=TK_REGISTER

   && sqlite3ExprIsConstantNotJoin(pExpr)
  ){
    ExprList *p = pParse->pConstExpr;
    int i;
    *pReg  = 0;
    if( p ){
      struct ExprList_item *pItem;

}

/*
** Add code to implement the OFFSET
*/
static void codeOffset(
  Vdbe *v,          /* Generate code into this VM */
  int iOffset,      /* Register holding the offset counter */
  int iContinue     /* Jump here to skip the current record */
){
  if( iOffset>0 && iContinue!=0 ){
    int addr;
    sqlite3VdbeAddOp2(v, OP_AddImm, iOffset, -1);
    addr = sqlite3VdbeAddOp1(v, OP_IfNeg, iOffset);
    sqlite3VdbeAddOp2(v, OP_Goto, 0, iContinue);
    VdbeComment((v, "skip OFFSET records"));
    sqlite3VdbeJumpHere(v, addr);
  }
}

/*

  int addrTnct;   /* Address of OP_OpenEphemeral opcode for tabTnct */
};

/*
** This routine generates the code for the inside of the inner loop
** of a SELECT.
**
** If srcTab is negative, then the pEList expressions
** are evaluated in order to get the data for this row.  If srcTab is
** zero or more, then data is pulled from srcTab and pEList is used only 
** to get number columns and the datatype for each column.
*/
static void selectInnerLoop(
  Parse *pParse,          /* The parser context */
  Select *p,              /* The complete select statement being coded */
  ExprList *pEList,       /* List of values being extracted */
  int srcTab,             /* Pull data from this table */

  ExprList *pOrderBy,     /* If not NULL, sort results using this key */
  DistinctCtx *pDistinct, /* If not NULL, info on how to process DISTINCT */
  SelectDest *pDest,      /* How to dispose of the results */
  int iContinue,          /* Jump here to continue with next row */
  int iBreak              /* Jump here to break out of the inner loop */
){
  Vdbe *v = pParse->pVdbe;
  int i;
  int hasDistinct;        /* True if the DISTINCT keyword is present */
  int regResult;              /* Start of memory holding result set */
  int eDest = pDest->eDest;   /* How to dispose of results */
  int iParm = pDest->iSDParm; /* First argument to disposal method */
  int nResultCol;             /* Number of result columns */

  assert( v );

  assert( pEList!=0 );
  hasDistinct = pDistinct ? pDistinct->eTnctType : WHERE_DISTINCT_NOOP;
  if( pOrderBy==0 && !hasDistinct ){
    codeOffset(v, p->iOffset, iContinue);
  }

  /* Pull the requested columns.
  */



  nResultCol = pEList->nExpr;

  if( pDest->iSdst==0 ){
    pDest->iSdst = pParse->nMem+1;
    pDest->nSdst = nResultCol;
    pParse->nMem += nResultCol;
  }else{ 
    assert( pDest->nSdst==nResultCol );
  }
  regResult = pDest->iSdst;
  if( srcTab>=0 ){
    for(i=0; i<nResultCol; i++){
      sqlite3VdbeAddOp3(v, OP_Column, srcTab, i, regResult+i);
      VdbeComment((v, "%s", pEList->a[i].zName));
    }
  }else if( eDest!=SRT_Exists ){
    /* If the destination is an EXISTS(...) expression, the actual
    ** values returned by the SELECT are not required.
    */
    sqlite3ExprCodeExprList(pParse, pEList, regResult,
                            (eDest==SRT_Output)?SQLITE_ECEL_DUP:0);
  }


  /* If the DISTINCT keyword was present on the SELECT statement
  ** and this row has been seen before, then do not make this row
  ** part of the result.
  */
  if( hasDistinct ){


    switch( pDistinct->eTnctType ){
      case WHERE_DISTINCT_ORDERED: {
        VdbeOp *pOp;            /* No longer required OpenEphemeral instr. */
        int iJump;              /* Jump destination */
        int regPrev;            /* Previous row content */

        /* Allocate space for the previous row */
        regPrev = pParse->nMem+1;
        pParse->nMem += nResultCol;

        /* Change the OP_OpenEphemeral coded earlier to an OP_Null
        ** sets the MEM_Cleared bit on the first register of the
        ** previous value.  This will cause the OP_Ne below to always
        ** fail on the first iteration of the loop even if the first
        ** row is all NULLs.
        */
        sqlite3VdbeChangeToNoop(v, pDistinct->addrTnct);
        pOp = sqlite3VdbeGetOp(v, pDistinct->addrTnct);
        pOp->opcode = OP_Null;
        pOp->p1 = 1;
        pOp->p2 = regPrev;

        iJump = sqlite3VdbeCurrentAddr(v) + nResultCol;
        for(i=0; i<nResultCol; i++){
          CollSeq *pColl = sqlite3ExprCollSeq(pParse, pEList->a[i].pExpr);
          if( i<nResultCol-1 ){
            sqlite3VdbeAddOp3(v, OP_Ne, regResult+i, iJump, regPrev+i);
          }else{
            sqlite3VdbeAddOp3(v, OP_Eq, regResult+i, iContinue, regPrev+i);
          }
          sqlite3VdbeChangeP4(v, -1, (const char *)pColl, P4_COLLSEQ);
          sqlite3VdbeChangeP5(v, SQLITE_NULLEQ);
        }
        assert( sqlite3VdbeCurrentAddr(v)==iJump );
        sqlite3VdbeAddOp3(v, OP_Copy, regResult, regPrev, nResultCol-1);
        break;
      }

      case WHERE_DISTINCT_UNIQUE: {
        sqlite3VdbeChangeToNoop(v, pDistinct->addrTnct);
        break;
      }

      default: {
        assert( pDistinct->eTnctType==WHERE_DISTINCT_UNORDERED );
        codeDistinct(pParse, pDistinct->tabTnct, iContinue, nResultCol, regResult);
        break;
      }
    }
    if( pOrderBy==0 ){
      codeOffset(v, p->iOffset, iContinue);
    }
  }

  switch( eDest ){
    /* In this mode, write each query result to the key of the temporary
    ** table iParm.
    */
#ifndef SQLITE_OMIT_COMPOUND_SELECT
    case SRT_Union: {
      int r1;
      r1 = sqlite3GetTempReg(pParse);
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nResultCol, r1);
      sqlite3VdbeAddOp2(v, OP_IdxInsert, iParm, r1);
      sqlite3ReleaseTempReg(pParse, r1);
      break;
    }

    /* Construct a record from the query result, but instead of
    ** saving that record, use it as a key to delete elements from
    ** the temporary table iParm.
    */
    case SRT_Except: {
      sqlite3VdbeAddOp3(v, OP_IdxDelete, iParm, regResult, nResultCol);
      break;
    }
#endif /* SQLITE_OMIT_COMPOUND_SELECT */

    /* Store the result as data using a unique key.
    */
    case SRT_DistTable:
    case SRT_Table:
    case SRT_EphemTab: {
      int r1 = sqlite3GetTempReg(pParse);
      testcase( eDest==SRT_Table );
      testcase( eDest==SRT_EphemTab );
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nResultCol, r1);
#ifndef SQLITE_OMIT_CTE
      if( eDest==SRT_DistTable ){
        /* If the destination is DistTable, then cursor (iParm+1) is open
        ** on an ephemeral index. If the current row is already present
        ** in the index, do not write it to the output. If not, add the
        ** current row to the index and proceed with writing it to the
        ** output table as well.  */

#ifndef SQLITE_OMIT_SUBQUERY
    /* If we are creating a set for an "expr IN (SELECT ...)" construct,
    ** then there should be a single item on the stack.  Write this
    ** item into the set table with bogus data.
    */
    case SRT_Set: {
      assert( nResultCol==1 );
      pDest->affSdst =
                  sqlite3CompareAffinity(pEList->a[0].pExpr, pDest->affSdst);
      if( pOrderBy ){
        /* At first glance you would think we could optimize out the
        ** ORDER BY in this case since the order of entries in the set
        ** does not matter.  But there might be a LIMIT clause, in which
        ** case the order does matter */

    }

    /* If this is a scalar select that is part of an expression, then
    ** store the results in the appropriate memory cell and break out
    ** of the scan loop.
    */
    case SRT_Mem: {
      assert( nResultCol==1 );
      if( pOrderBy ){
        pushOntoSorter(pParse, pOrderBy, p, regResult);
      }else{
        sqlite3ExprCodeMove(pParse, regResult, iParm, 1);
        /* The LIMIT clause will jump out of the loop for us */
      }
      break;
    }
#endif /* #ifndef SQLITE_OMIT_SUBQUERY */

    /* Send the data to the callback function or to a subroutine.  In the
    ** case of a subroutine, the subroutine itself is responsible for
    ** popping the data from the stack.
    */
    case SRT_Coroutine:
    case SRT_Output: {
      testcase( eDest==SRT_Coroutine );
      testcase( eDest==SRT_Output );
      if( pOrderBy ){
        int r1 = sqlite3GetTempReg(pParse);
        sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nResultCol, r1);
        pushOntoSorter(pParse, pOrderBy, p, r1);
        sqlite3ReleaseTempReg(pParse, r1);
      }else if( eDest==SRT_Coroutine ){
        sqlite3VdbeAddOp1(v, OP_Yield, pDest->iSDParm);
      }else{
        sqlite3VdbeAddOp2(v, OP_ResultRow, regResult, nResultCol);
        sqlite3ExprCacheAffinityChange(pParse, regResult, nResultCol);
      }
      break;
    }

#ifndef SQLITE_OMIT_CTE
    /* Write the results into a priority queue that is order according to
    ** pDest->pOrderBy (in pSO).  pDest->iSDParm (in iParm) is the cursor for an
    ** index with pSO->nExpr+2 columns.  Build a key using pSO for the first
    ** pSO->nExpr columns, then make sure all keys are unique by adding a
    ** final OP_Sequence column.  The last column is the record as a blob.
    */
    case SRT_DistQueue:
    case SRT_Queue: {
      int nKey;
      int r1, r2, r3;
      int addrTest = 0;
      ExprList *pSO;
      pSO = pDest->pOrderBy;
      assert( pSO );
      nKey = pSO->nExpr;
      r1 = sqlite3GetTempReg(pParse);
      r2 = sqlite3GetTempRange(pParse, nKey+2);
      r3 = r2+nKey+1;
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nResultCol, r3);
      if( eDest==SRT_DistQueue ){
        /* If the destination is DistQueue, then cursor (iParm+1) is open
        ** on a second ephemeral index that holds all values every previously
        ** added to the queue.  Only add this new value if it has never before
        ** been added */
        addrTest = sqlite3VdbeAddOp4Int(v, OP_Found, iParm+1, 0, r3, 0);
        sqlite3VdbeAddOp2(v, OP_IdxInsert, iParm+1, r3);
      }
      for(i=0; i<nKey; i++){
        sqlite3VdbeAddOp2(v, OP_SCopy,
                          regResult + pSO->a[i].u.x.iOrderByCol - 1,
                          r2+i);
      }
      sqlite3VdbeAddOp2(v, OP_Sequence, iParm, r2+nKey);
      sqlite3VdbeAddOp3(v, OP_MakeRecord, r2, nKey+2, r1);
      sqlite3VdbeAddOp2(v, OP_IdxInsert, iParm, r1);
      if( addrTest ) sqlite3VdbeJumpHere(v, addrTest);
      sqlite3ReleaseTempReg(pParse, r1);
      sqlite3ReleaseTempRange(pParse, r2, nKey+2);
      break;
    }
#endif /* SQLITE_OMIT_CTE */



#if !defined(SQLITE_OMIT_TRIGGER)
    /* Discard the results.  This is used for SELECT statements inside
    ** the body of a TRIGGER.  The purpose of such selects is to call
    ** user-defined functions that have side effects.  We do not care
    ** about the actual results of the select.
    */

** then the KeyInfo structure is appropriate for initializing a virtual
** index to implement a DISTINCT test.
**
** Space to hold the KeyInfo structure is obtain from malloc.  The calling
** function is responsible for seeing that this structure is eventually
** freed.
*/
static KeyInfo *keyInfoFromExprList(Parse *pParse, ExprList *pList, int nExtra){
  int nExpr;
  KeyInfo *pInfo;
  struct ExprList_item *pItem;
  sqlite3 *db = pParse->db;
  int i;

  nExpr = pList->nExpr;
  pInfo = sqlite3KeyInfoAlloc(db, nExpr+nExtra, 1);
  if( pInfo ){
    assert( sqlite3KeyInfoIsWriteable(pInfo) );
    for(i=0, pItem=pList->a; i<nExpr; i++, pItem++){
      CollSeq *pColl;
      pColl = sqlite3ExprCollSeq(pParse, pItem->pExpr);
      if( !pColl ) pColl = db->pDfltColl;
      pInfo->aColl[i] = pColl;

    regRowid = sqlite3GetTempReg(pParse);
  }
  if( p->selFlags & SF_UseSorter ){
    int regSortOut = ++pParse->nMem;
    int ptab2 = pParse->nTab++;
    sqlite3VdbeAddOp3(v, OP_OpenPseudo, ptab2, regSortOut, pOrderBy->nExpr+2);
    addr = 1 + sqlite3VdbeAddOp2(v, OP_SorterSort, iTab, addrBreak);
    codeOffset(v, p->iOffset, addrContinue);
    sqlite3VdbeAddOp2(v, OP_SorterData, iTab, regSortOut);
    sqlite3VdbeAddOp3(v, OP_Column, ptab2, pOrderBy->nExpr+1, regRow);
    sqlite3VdbeChangeP5(v, OPFLAG_CLEARCACHE);
  }else{
    addr = 1 + sqlite3VdbeAddOp2(v, OP_Sort, iTab, addrBreak);
    codeOffset(v, p->iOffset, addrContinue);
    sqlite3VdbeAddOp3(v, OP_Column, iTab, pOrderBy->nExpr+1, regRow);
  }
  switch( eDest ){
    case SRT_Table:
    case SRT_EphemTab: {
      testcase( eDest==SRT_Table );
      testcase( eDest==SRT_EphemTab );

** keywords.  Or NULL if those keywords are omitted. iLimit and iOffset 
** are the integer memory register numbers for counters used to compute 
** the limit and offset.  If there is no limit and/or offset, then 
** iLimit and iOffset are negative.
**
** This routine changes the values of iLimit and iOffset only if
** a limit or offset is defined by pLimit and pOffset.  iLimit and
** iOffset should have been preset to appropriate default values (zero)
** prior to calling this routine.
**
** The iOffset register (if it exists) is initialized to the value
** of the OFFSET.  The iLimit register is initialized to LIMIT.  Register
** iOffset+1 is initialized to LIMIT+OFFSET.
**
** Only if pLimit!=0 or pOffset!=0 do the limit registers get
** redefined.  The UNION ALL operator uses this property to force
** the reuse of the same limit and offset registers across multiple
** SELECT statements.
*/
static void computeLimitRegisters(Parse *pParse, Select *p, int iBreak){
  Vdbe *v = 0;

  ** no rows.
  */
  sqlite3ExprCacheClear(pParse);
  assert( p->pOffset==0 || p->pLimit!=0 );
  if( p->pLimit ){
    p->iLimit = iLimit = ++pParse->nMem;
    v = sqlite3GetVdbe(pParse);
    assert( v!=0 );
    if( sqlite3ExprIsInteger(p->pLimit, &n) ){
      sqlite3VdbeAddOp2(v, OP_Integer, n, iLimit);
      VdbeComment((v, "LIMIT counter"));
      if( n==0 ){
        sqlite3VdbeAddOp2(v, OP_Goto, 0, iBreak);
      }else if( n>=0 && p->nSelectRow>(u64)n ){
        p->nSelectRow = n;

  if( pRet==0 && iCol<p->pEList->nExpr ){
    pRet = sqlite3ExprCollSeq(pParse, p->pEList->a[iCol].pExpr);
  }
  return pRet;
}
#endif /* SQLITE_OMIT_COMPOUND_SELECT */

#ifndef SQLITE_OMIT_CTE
/*
** This routine generates VDBE code to compute the content of a WITH RECURSIVE
** query of the form:
**
**   <recursive-table> AS (<setup-query> UNION [ALL] <recursive-query>)
**                         \___________/             \_______________/
**                           p->pPrior                      p
**
**
** There is exactly one reference to the recursive-table in the FROM clause
** of recursive-query, marked with the SrcList->a[].isRecursive flag.
**
** The setup-query runs once to generate an initial set of rows that go
** into a Queue table.  Rows are extracted from the Queue table one by
** one.  Each row extracted from Queue is output to pDest.  Then the single
** extracted row (now in the iCurrent table) becomes the content of the
** recursive-table for a recursive-query run.  The output of the recursive-query
** is added back into the Queue table.  Then another row is extracted from Queue
** and the iteration continues until the Queue table is empty.
**
** If the compound query operator is UNION then no duplicate rows are ever
** inserted into the Queue table.  The iDistinct table keeps a copy of all rows
** that have ever been inserted into Queue and causes duplicates to be
** discarded.  If the operator is UNION ALL, then duplicates are allowed.
** 
** If the query has an ORDER BY, then entries in the Queue table are kept in
** ORDER BY order and the first entry is extracted for each cycle.  Without
** an ORDER BY, the Queue table is just a FIFO.
**
** If a LIMIT clause is provided, then the iteration stops after LIMIT rows
** have been output to pDest.  A LIMIT of zero means to output no rows and a
** negative LIMIT means to output all rows.  If there is also an OFFSET clause
** with a positive value, then the first OFFSET outputs are discarded rather
** than being sent to pDest.  The LIMIT count does not begin until after OFFSET
** rows have been skipped.
*/
static void generateWithRecursiveQuery(
  Parse *pParse,        /* Parsing context */
  Select *p,            /* The recursive SELECT to be coded */
  SelectDest *pDest     /* What to do with query results */
){
  SrcList *pSrc = p->pSrc;      /* The FROM clause of the recursive query */
  int nCol = p->pEList->nExpr;  /* Number of columns in the recursive table */
  Vdbe *v = pParse->pVdbe;      /* The prepared statement under construction */
  Select *pSetup = p->pPrior;   /* The setup query */
  int addrTop;                  /* Top of the loop */
  int addrCont, addrBreak;      /* CONTINUE and BREAK addresses */
  int iCurrent;                 /* The Current table */
  int regCurrent;               /* Register holding Current table */
  int iQueue;                   /* The Queue table */
  int iDistinct = 0;            /* To ensure unique results if UNION */
  int eDest = SRT_Table;        /* How to write to Queue */
  SelectDest destQueue;         /* SelectDest targetting the Queue table */
  int i;                        /* Loop counter */
  int rc;                       /* Result code */
  ExprList *pOrderBy;           /* The ORDER BY clause */
  Expr *pLimit, *pOffset;       /* Saved LIMIT and OFFSET */
  int regLimit, regOffset;      /* Registers used by LIMIT and OFFSET */

  /* Obtain authorization to do a recursive query */
  if( sqlite3AuthCheck(pParse, SQLITE_RECURSIVE, 0, 0, 0) ) return;

  /* Process the LIMIT and OFFSET clauses, if they exist */
  addrBreak = sqlite3VdbeMakeLabel(v);
  computeLimitRegisters(pParse, p, addrBreak);
  pLimit = p->pLimit;
  pOffset = p->pOffset;
  regLimit = p->iLimit;
  regOffset = p->iOffset;
  p->pLimit = p->pOffset = 0;
  p->iLimit = p->iOffset = 0;

  /* Locate the cursor number of the Current table */
  for(i=0; ALWAYS(i<pSrc->nSrc); i++){
    if( pSrc->a[i].isRecursive ){
      iCurrent = pSrc->a[i].iCursor;
      break;
    }
  }

  /* Detach the ORDER BY clause from the compound SELECT */
  pOrderBy = p->pOrderBy;
  p->pOrderBy = 0;

  /* Allocate cursors numbers for Queue and Distinct.  The cursor number for
  ** the Distinct table must be exactly one greater than Queue in order
  ** for the SRT_DistTable and SRT_DistQueue destinations to work. */
  iQueue = pParse->nTab++;
  if( p->op==TK_UNION ){
    eDest = pOrderBy ? SRT_DistQueue : SRT_DistTable;
    iDistinct = pParse->nTab++;
  }else{
    eDest = pOrderBy ? SRT_Queue : SRT_Table;
  }
  sqlite3SelectDestInit(&destQueue, eDest, iQueue);

  /* Allocate cursors for Current, Queue, and Distinct. */
  regCurrent = ++pParse->nMem;
  sqlite3VdbeAddOp3(v, OP_OpenPseudo, iCurrent, regCurrent, nCol);
  if( pOrderBy ){
    KeyInfo *pKeyInfo = keyInfoFromExprList(pParse, pOrderBy, 1);
    sqlite3VdbeAddOp4(v, OP_OpenEphemeral, iQueue, pOrderBy->nExpr+2, 0,
                      (char*)pKeyInfo, P4_KEYINFO);
    destQueue.pOrderBy = pOrderBy;
  }else{
    sqlite3VdbeAddOp2(v, OP_OpenEphemeral, iQueue, nCol);
  }
  VdbeComment((v, "Queue table"));
  if( iDistinct ){
    p->addrOpenEphm[0] = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, iDistinct, 0);
    p->selFlags |= SF_UsesEphemeral;
  }

  /* Store the results of the setup-query in Queue. */
  rc = sqlite3Select(pParse, pSetup, &destQueue);
  if( rc ) goto end_of_recursive_query;

  /* Find the next row in the Queue and output that row */
  addrTop = sqlite3VdbeAddOp2(v, OP_Rewind, iQueue, addrBreak);

  /* Transfer the next row in Queue over to Current */
  sqlite3VdbeAddOp1(v, OP_NullRow, iCurrent); /* To reset column cache */
  if( pOrderBy ){
    sqlite3VdbeAddOp3(v, OP_Column, iQueue, pOrderBy->nExpr+1, regCurrent);
  }else{
    sqlite3VdbeAddOp2(v, OP_RowData, iQueue, regCurrent);
  }
  sqlite3VdbeAddOp1(v, OP_Delete, iQueue);

  /* Output the single row in Current */
  addrCont = sqlite3VdbeMakeLabel(v);
  codeOffset(v, regOffset, addrCont);
  selectInnerLoop(pParse, p, p->pEList, iCurrent,
      0, 0, pDest, addrCont, addrBreak);
  if( regLimit ) sqlite3VdbeAddOp3(v, OP_IfZero, regLimit, addrBreak, -1);
  sqlite3VdbeResolveLabel(v, addrCont);

  /* Execute the recursive SELECT taking the single row in Current as
  ** the value for the recursive-table. Store the results in the Queue.
  */
  p->pPrior = 0;
  sqlite3Select(pParse, p, &destQueue);
  assert( p->pPrior==0 );
  p->pPrior = pSetup;

  /* Keep running the loop until the Queue is empty */
  sqlite3VdbeAddOp2(v, OP_Goto, 0, addrTop);
  sqlite3VdbeResolveLabel(v, addrBreak);

end_of_recursive_query:
  p->pOrderBy = pOrderBy;
  p->pLimit = pLimit;
  p->pOffset = pOffset;
  return;
}
#endif

/* Forward references */
static int multiSelectOrderBy(
  Parse *pParse,        /* Parsing context */
  Select *p,            /* The right-most of SELECTs to be coded */
  SelectDest *pDest     /* What to do with query results */
);

    }
    rc = 1;
    goto multi_select_end;
  }

#ifndef SQLITE_OMIT_CTE
  if( p->selFlags & SF_Recursive ){













    generateWithRecursiveQuery(pParse, p, &dest);












































































  }else
#endif

  /* Compound SELECTs that have an ORDER BY clause are handled separately.
  */
  if( p->pOrderBy ){
    return multiSelectOrderBy(pParse, p, pDest);

          generateColumnNames(pParse, 0, pFirst->pEList);
        }
        iBreak = sqlite3VdbeMakeLabel(v);
        iCont = sqlite3VdbeMakeLabel(v);
        computeLimitRegisters(pParse, p, iBreak);
        sqlite3VdbeAddOp2(v, OP_Rewind, unionTab, iBreak);
        iStart = sqlite3VdbeCurrentAddr(v);
        selectInnerLoop(pParse, p, p->pEList, unionTab,
                        0, 0, &dest, iCont, iBreak);
        sqlite3VdbeResolveLabel(v, iCont);
        sqlite3VdbeAddOp2(v, OP_Next, unionTab, iStart);
        sqlite3VdbeResolveLabel(v, iBreak);
        sqlite3VdbeAddOp2(v, OP_Close, unionTab, 0);
      }
      break;

      iCont = sqlite3VdbeMakeLabel(v);
      computeLimitRegisters(pParse, p, iBreak);
      sqlite3VdbeAddOp2(v, OP_Rewind, tab1, iBreak);
      r1 = sqlite3GetTempReg(pParse);
      iStart = sqlite3VdbeAddOp2(v, OP_RowKey, tab1, r1);
      sqlite3VdbeAddOp4Int(v, OP_NotFound, tab2, iCont, r1, 0);
      sqlite3ReleaseTempReg(pParse, r1);
      selectInnerLoop(pParse, p, p->pEList, tab1,
                      0, 0, &dest, iCont, iBreak);
      sqlite3VdbeResolveLabel(v, iCont);
      sqlite3VdbeAddOp2(v, OP_Next, tab1, iStart);
      sqlite3VdbeResolveLabel(v, iBreak);
      sqlite3VdbeAddOp2(v, OP_Close, tab2, 0);
      sqlite3VdbeAddOp2(v, OP_Close, tab1, 0);
      break;

    sqlite3VdbeAddOp3(v, OP_Copy, pIn->iSdst, regPrev+1, pIn->nSdst-1);
    sqlite3VdbeAddOp2(v, OP_Integer, 1, regPrev);
  }
  if( pParse->db->mallocFailed ) return 0;

  /* Suppress the first OFFSET entries if there is an OFFSET clause
  */
  codeOffset(v, p->iOffset, iContinue);

  switch( pDest->eDest ){
    /* Store the result as data using a unique key.
    */
    case SRT_Table:
    case SRT_EphemTab: {
      int r1 = sqlite3GetTempReg(pParse);

      Expr *pE = pFunc->pExpr;
      assert( !ExprHasProperty(pE, EP_xIsSelect) );
      if( pE->x.pList==0 || pE->x.pList->nExpr!=1 ){
        sqlite3ErrorMsg(pParse, "DISTINCT aggregates must have exactly one "
           "argument");
        pFunc->iDistinct = -1;
      }else{
        KeyInfo *pKeyInfo = keyInfoFromExprList(pParse, pE->x.pList, 0);
        sqlite3VdbeAddOp4(v, OP_OpenEphemeral, pFunc->iDistinct, 0, 0,
                          (char*)pKeyInfo, P4_KEYINFO);
      }
    }
  }
}

#else
# define explainSimpleCount(a,b,c)
#endif

/*
** Generate code for the SELECT statement given in the p argument.  
**

** The results are returned according to the SelectDest structure.






















** See comments in sqliteInt.h for further information.



















**
** This routine returns the number of errors.  If any errors are
** encountered, then an appropriate error message is left in
** pParse->zErrMsg.
**
** This routine does NOT free the Select structure passed in.  The
** calling function needs to do that.

  ** extracted in pre-sorted order.  If that is the case, then the
  ** OP_OpenEphemeral instruction will be changed to an OP_Noop once
  ** we figure out that the sorting index is not needed.  The addrSortIndex
  ** variable is used to facilitate that change.
  */
  if( pOrderBy ){
    KeyInfo *pKeyInfo;
    pKeyInfo = keyInfoFromExprList(pParse, pOrderBy, 0);
    pOrderBy->iECursor = pParse->nTab++;
    p->addrOpenEphm[2] = addrSortIndex =
      sqlite3VdbeAddOp4(v, OP_OpenEphemeral,
                           pOrderBy->iECursor, pOrderBy->nExpr+2, 0,
                           (char*)pKeyInfo, P4_KEYINFO);
  }else{
    addrSortIndex = -1;

  /* Open a virtual index to use for the distinct set.
  */
  if( p->selFlags & SF_Distinct ){
    sDistinct.tabTnct = pParse->nTab++;
    sDistinct.addrTnct = sqlite3VdbeAddOp4(v, OP_OpenEphemeral,
                                sDistinct.tabTnct, 0, 0,
                                (char*)keyInfoFromExprList(pParse, p->pEList, 0),
                                P4_KEYINFO);
    sqlite3VdbeChangeP5(v, BTREE_UNORDERED);
    sDistinct.eTnctType = WHERE_DISTINCT_UNORDERED;
  }else{
    sDistinct.eTnctType = WHERE_DISTINCT_NOOP;
  }

    */
    if( addrSortIndex>=0 && pOrderBy==0 ){
      sqlite3VdbeChangeToNoop(v, addrSortIndex);
      p->addrOpenEphm[2] = -1;
    }

    /* Use the standard inner loop. */
    selectInnerLoop(pParse, p, pEList, -1, pOrderBy, &sDistinct, pDest,
                    sqlite3WhereContinueLabel(pWInfo),
                    sqlite3WhereBreakLabel(pWInfo));

    /* End the database scan loop.
    */
    sqlite3WhereEnd(pWInfo);
  }else{

      /* If there is a GROUP BY clause we might need a sorting index to
      ** implement it.  Allocate that sorting index now.  If it turns out
      ** that we do not need it after all, the OP_SorterOpen instruction
      ** will be converted into a Noop.  
      */
      sAggInfo.sortingIdx = pParse->nTab++;
      pKeyInfo = keyInfoFromExprList(pParse, pGroupBy, 0);
      addrSortingIdx = sqlite3VdbeAddOp4(v, OP_SorterOpen, 
          sAggInfo.sortingIdx, sAggInfo.nSortingColumn, 
          0, (char*)pKeyInfo, P4_KEYINFO);

      /* Initialize memory locations used by GROUP BY aggregate processing
      */
      iUseFlag = ++pParse->nMem;

      sqlite3VdbeResolveLabel(v, addrOutputRow);
      addrOutputRow = sqlite3VdbeCurrentAddr(v);
      sqlite3VdbeAddOp2(v, OP_IfPos, iUseFlag, addrOutputRow+2);
      VdbeComment((v, "Groupby result generator entry point"));
      sqlite3VdbeAddOp1(v, OP_Return, regOutputRow);
      finalizeAggFunctions(pParse, &sAggInfo);
      sqlite3ExprIfFalse(pParse, pHaving, addrOutputRow+1, SQLITE_JUMPIFNULL);
      selectInnerLoop(pParse, p, p->pEList, -1, pOrderBy,
                      &sDistinct, pDest,
                      addrOutputRow+1, addrSetAbort);
      sqlite3VdbeAddOp1(v, OP_Return, regOutputRow);
      VdbeComment((v, "end groupby result generator"));

      /* Generate a subroutine that will reset the group-by accumulator
      */

        }
        sqlite3WhereEnd(pWInfo);
        finalizeAggFunctions(pParse, &sAggInfo);
      }

      pOrderBy = 0;
      sqlite3ExprIfFalse(pParse, pHaving, addrEnd, SQLITE_JUMPIFNULL);
      selectInnerLoop(pParse, p, p->pEList, -1, 0, 0, 
                      pDest, addrEnd, addrEnd);
      sqlite3ExprListDelete(db, pDel);
    }
    sqlite3VdbeResolveLabel(v, addrEnd);
    
  } /* endif aggregate query */

  {
    /* Case 6:  There is no usable index.  We must do a complete
    **          scan of the entire table.
    */
    static const u8 aStep[] = { OP_Next, OP_Prev };
    static const u8 aStart[] = { OP_Rewind, OP_Last };
    assert( bRev==0 || bRev==1 );
    if( pTabItem->isRecursive ){
      /* Tables marked isRecursive have only a single row that is stored in
      ** a pseudo-cursor.  No need to Rewind or Next such cursors. */
      pLevel->op = OP_Noop;
    }else{
      pLevel->op = aStep[bRev];
      pLevel->p1 = iCur;
      pLevel->p2 = 1 + sqlite3VdbeAddOp2(v, aStart[bRev], iCur, addrBrk);
      pLevel->p5 = SQLITE_STMTSTATUS_FULLSCAN_STEP;
    }
  }

  /* Insert code to test every subexpression that can be completely
  ** computed using the current set of tables.
  */
  for(pTerm=pWC->a, j=pWC->nTerm; j>0; j--, pTerm++){
    Expr *pE;

  /* If SQLite is already completely initialized, then this call
  ** to sqlite3_initialize() should be a no-op.  But the initialization
  ** must be complete.  So isInit must not be set until the very end
  ** of this routine.
  */
  if( sqlite3GlobalConfig.isInit ) return SQLITE_OK;








  /* Make sure the mutex subsystem is initialized.  If unable to 
  ** initialize the mutex subsystem, return early with the error.
  ** If the system is so sick that we are unable to allocate a mutex,
  ** there is not much SQLite is going to be able to do.
  **
  ** The mutex subsystem must take care of serializing its own
  ** initialization.

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.8.3"
#define SQLITE_VERSION_NUMBER 3008003
#define SQLITE_SOURCE_ID      "2014-01-22 18:16:27 b6cea42006910d590373e8f9e296d7672edb114b"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros