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Materialize any CTE that is used more than once.

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FossilOrigin-Name: ba59159fbe6b83fb6d79fbfee22d983768b0ebbaac7e99d2ac66c810e5e04100
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drh
2021-02-21 23:44:14 +00:00
parent 7601294ad3
commit a79e2a2d28
9 changed files with 117 additions and 42 deletions
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5
src/expr.c
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@@ -1544,7 +1544,10 @@ SrcList *sqlite3SrcListDup(sqlite3 *db, SrcList *p, int flags){
if( pNewItem->fg.isIndexedBy ){
pNewItem->u1.zIndexedBy = sqlite3DbStrDup(db, pOldItem->u1.zIndexedBy);
}
pNewItem->pIBIndex = pOldItem->pIBIndex;
pNewItem->u2 = pOldItem->u2;
if( pNewItem->fg.isCte ){
pNewItem->u2.pCteUse->nUse++;
}
if( pNewItem->fg.isTabFunc ){
pNewItem->u1.pFuncArg =
sqlite3ExprListDup(db, pOldItem->u1.pFuncArg, flags);