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Avoid a dangling pointer comparison when renaming a table that has a trigger

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that itself contains a window function with an (illegal) column reference in a
FOLLOWING expression.

FossilOrigin-Name: d45bee36f2c1091a2d32c16ca8921bf4e7c9e40c46d0a36fbcb179ecfafcfbf0
This commit is contained in:
dan
2019-01-16 12:05:22 +00:00
parent 4ccb41fc99
commit fb8ac325d7
4 changed files with 64 additions and 8 deletions
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src/window.c
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@@ -881,6 +881,7 @@ void sqlite3WindowListDelete(sqlite3 *db, Window *p){
*/
static Expr *sqlite3WindowOffsetExpr(Parse *pParse, Expr *pExpr){
if( 0==sqlite3ExprIsConstant(pExpr) ){
if( IN_RENAME_OBJECT ) sqlite3RenameExprUnmap(pParse, pExpr);
sqlite3ExprDelete(pParse->db, pExpr);
pExpr = sqlite3ExprAlloc(pParse->db, TK_NULL, 0, 0);
}