Omit unnecessary CHECK constraints in UPDATE statements, when none of the

columns referenced in the CHECK constraint are modified.

FossilOrigin-Name: 02fbdbc782dd98f080bf4482d820f36c0ef3d519

src/sqliteInt.h

@@ -3100,6 +3100,7 @@ struct Walker {
     SrcList *pSrcList;                         /* FROM clause */
     struct SrcCount *pSrcCount;                /* Counting column references */
     struct CCurHint *pCCurHint;                /* Used by codeCursorHint() */
+    int *aiCol;                                /* array of column indexes */
   } u;
 };