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**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*******************************************************************************
**
** This file contains code used to find decendants of a version
** This file contains code used to find descendants of a version
** or leaves of a version tree.
*/
#include "config.h"
#include "descendants.h"
#include <assert.h>
/*
** Create a temporary table named "leaves" if it does not
** already exist. Load this table with the RID of all
** check-ins that are leaves which are decended from
** check-ins that are leaves which are descended from
** check-in iBase.
**
** A "leaf" is a check-in that has no children in the same branch.
** There is a separate permanent table LEAF that contains all leaves
** in the tree. This routine is used to compute a subset of that
** table consisting of leaves that are descended from a single checkin.
**
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/* Initialize the bags. */
bag_init(&seen);
bag_init(&pending);
bag_insert(&pending, iBase);
/* This query returns all non-branch-merge children of check-in :rid.
**
** If a a child is a merge of a fork within the same branch, it is
** If a child is a merge of a fork within the same branch, it is
** returned. Only merge children in different branches are excluded.
*/
db_prepare(&q1,
"SELECT cid FROM plink"
" WHERE pid=:rid"
" AND (isprim"
" OR coalesce((SELECT value FROM tagxref"
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