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Add the OP_FinishSeek opcode which completes an OP_DeferredSeek if the seek

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has not already completed.  Also add the sqlite3WhereUsesDeferredSeek()
interface to the query planner.  The UPDATE implementation adds an
OP_FinishSeek before running the final OP_Insert if one is needed.
Ticket [ec8abb025e78f40c] and also an assertion fault reported by Yongheng.

FossilOrigin-Name: 21ef6e99331210b80fa7c71b4f02e8f768a748d01aef884368af2f6b51a067e0
This commit is contained in:
drh
2019-12-29 00:52:41 +00:00
parent 997d7434b7
commit be3da24134
12 changed files with 79 additions and 35 deletions
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10
src/where.c
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@@ -120,7 +120,7 @@ int sqlite3WhereBreakLabel(WhereInfo *pWInfo){
/*
** Return ONEPASS_OFF (0) if an UPDATE or DELETE statement is unable to
** operate directly on the rowis returned by a WHERE clause. Return
** operate directly on the rowids returned by a WHERE clause. Return
** ONEPASS_SINGLE (1) if the statement can operation directly because only
** a single row is to be changed. Return ONEPASS_MULTI (2) if the one-pass
** optimization can be used on multiple
@@ -147,6 +147,14 @@ int sqlite3WhereOkOnePass(WhereInfo *pWInfo, int *aiCur){
return pWInfo->eOnePass;
}
/*
** Return TRUE if the WHERE loop uses the OP_DeferredSeek opcode to move
** the data cursor to the row selected by the index cursor.
*/
int sqlite3WhereUsesDeferredSeek(WhereInfo *pWInfo){
return pWInfo->bDeferredSeek;
}
/*
** Move the content of pSrc into pDest
*/