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Add the EP_Leaf flag bit to the Expr.flags field to indicate Expr

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nodes that do not have substructure.  Use that bit to avoid unnecessary
recursion.

FossilOrigin-Name: 8a6ea455cd1bf42ae0a7f1f1789baf88d782db13
This commit is contained in:
drh
2016-09-23 21:36:24 +00:00
parent e1c03b6233
commit 209bc522b0
7 changed files with 29 additions and 18 deletions
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4
src/walker.c
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@@ -41,7 +41,9 @@ static SQLITE_NOINLINE int walkExpr(Walker *pWalker, Expr *pExpr){
testcase( ExprHasProperty(pExpr, EP_TokenOnly) );
testcase( ExprHasProperty(pExpr, EP_Reduced) );
rc = pWalker->xExprCallback(pWalker, pExpr);
if( rc || ExprHasProperty(pExpr,EP_TokenOnly) ) return rc & WRC_Abort;
if( rc || ExprHasProperty(pExpr,(EP_TokenOnly|EP_Leaf)) ){
return rc & WRC_Abort;
}
if( pExpr->pLeft && walkExpr(pWalker, pExpr->pLeft) ) return WRC_Abort;
if( pExpr->pRight && walkExpr(pWalker, pExpr->pRight) ) return WRC_Abort;
if( ExprHasProperty(pExpr, EP_xIsSelect) ){