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Fix a problem in which nested CTEs with the same table name trick the

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code generator into thinking they are the same CTE, which then tries to
use the manifest them both into the same transient table.

FossilOrigin-Name: 202dd033019dd27428e3cc5f6e164c95b37efe39e2753515112b201ddefca67b
This commit is contained in:
drh
2018-12-27 02:16:01 +00:00
parent 7eb2c9176a
commit bdefaf08ee
4 changed files with 35 additions and 11 deletions
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11
src/select.c
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@@ -5466,14 +5466,19 @@ static struct SrcList_item *isSelfJoinView(
){
struct SrcList_item *pItem;
for(pItem = pTabList->a; pItem<pThis; pItem++){
Select *pS1;
if( pItem->pSelect==0 ) continue;
if( pItem->fg.viaCoroutine ) continue;
if( pItem->zName==0 ) continue;
if( sqlite3_stricmp(pItem->zDatabase, pThis->zDatabase)!=0 ) continue;
if( sqlite3_stricmp(pItem->zName, pThis->zName)!=0 ) continue;
if( sqlite3ExprCompare(0,
pThis->pSelect->pWhere, pItem->pSelect->pWhere, -1)
){
pS1 = pItem->pSelect;
if( pThis->pSelect->selId!=pS1->selId ){
/* The query flattener left two different CTE tables with identical
** names in the same FROM clause. */
continue;
}
if( sqlite3ExprCompare(0, pThis->pSelect->pWhere, pS1->pWhere, -1) ){
/* The view was modified by some other optimization such as
** pushDownWhereTerms() */
continue;