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Improved technique for parsing the ON and USING clauses of a join is faster

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and uses less memory.

FossilOrigin-Name: 158156a3e3d50042cafc75dea3aaaa68b1f2efb9c3d178518ea6e68e32e0d21c
This commit is contained in:
drh
2022-04-07 01:11:13 +00:00
parent 200adc9e75
commit d44f8b2385
16 changed files with 150 additions and 113 deletions
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20
src/expr.c
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@@ -1249,6 +1249,18 @@ void sqlite3ExprDelete(sqlite3 *db, Expr *p){
if( p ) sqlite3ExprDeleteNN(db, p);
}
/*
** Clear both elements of an OnOrUsing object
*/
void sqlite3ClearOnOrUsing(sqlite3 *db, OnOrUsing *p){
if( p==0 ){
/* Nothing to clear */
}else if( p->pOn ){
sqlite3ExprDeleteNN(db, p->pOn);
}else if( p->pUsing ){
sqlite3IdListDelete(db, p->pUsing);
}
}
/*
** Arrange to cause pExpr to be deleted when the pParse is deleted.
@@ -1671,8 +1683,12 @@ SrcList *sqlite3SrcListDup(sqlite3 *db, const SrcList *p, int flags){
pTab->nTabRef++;
}
pNewItem->pSelect = sqlite3SelectDup(db, pOldItem->pSelect, flags);
pNewItem->pOn = sqlite3ExprDup(db, pOldItem->pOn, flags);
pNewItem->pUsing = sqlite3IdListDup(db, pOldItem->pUsing);
if( pOldItem->fg.isUsing ){
assert( pNewItem->fg.isUsing );
pNewItem->u3.pUsing = sqlite3IdListDup(db, pOldItem->u3.pUsing);
}else{
pNewItem->u3.pOn = sqlite3ExprDup(db, pOldItem->u3.pOn, flags);
}
pNewItem->colUsed = pOldItem->colUsed;
}
return pNew;