Make sure the affinity and datatype of sub-subqueries are initialized

prior to subqueries as the latter relies on the former.

FossilOrigin-Name: 39b4e6ff9316cc78ea88349091e195b8104d1e9e

1 files changed, 2 insertions, 1 deletions

diff --git a/src/expr.c b/src/expr.c
index ae6a1dec1..a974c5a61 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1214,6 +1214,7 @@ static int selectNodeIsConstant(Walker *pWalker, Select *NotUsed){
 }
 static int exprIsConst(Expr *p, int initFlag){
   Walker w;
+  memset(&w, 0, sizeof(w));
   w.u.i = initFlag;
   w.xExprCallback = exprNodeIsConstant;
   w.xSelectCallback = selectNodeIsConstant;
@@ -3428,8 +3429,8 @@ void sqlite3ExprCodeConstants(Parse *pParse, Expr *pExpr){
   Walker w;
   if( pParse->cookieGoto ) return;
   if( OptimizationDisabled(pParse->db, SQLITE_FactorOutConst) ) return;
+  memset(&w, 0, sizeof(w));
   w.xExprCallback = evalConstExpr;
-  w.xSelectCallback = 0;
   w.pParse = pParse;
   sqlite3WalkExpr(&w, pExpr);
 }