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Exploit the fact that Expr.pRight and Expr.x are never used at the same time

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for a small performance gain.

FossilOrigin-Name: aacbb9a461fdb34c7f9c8ce348e44c3e96c93334f210d438d92bfac1794dc686
This commit is contained in:
drh
2017-07-07 13:59:34 +00:00
parent c2d14a9a33
commit d10866798d
4 changed files with 15 additions and 12 deletions
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5
src/expr.c
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@@ -1025,8 +1025,9 @@ static SQLITE_NOINLINE void sqlite3ExprDeleteNN(sqlite3 *db, Expr *p){
/* The Expr.x union is never used at the same time as Expr.pRight */
assert( p->x.pList==0 || p->pRight==0 );
if( p->pLeft && p->op!=TK_SELECT_COLUMN ) sqlite3ExprDeleteNN(db, p->pLeft);
sqlite3ExprDelete(db, p->pRight);
if( ExprHasProperty(p, EP_xIsSelect) ){
if( p->pRight ){
sqlite3ExprDeleteNN(db, p->pRight);
}else if( ExprHasProperty(p, EP_xIsSelect) ){
sqlite3SelectDelete(db, p->x.pSelect);
}else{
sqlite3ExprListDelete(db, p->x.pList);