Improved byte-code comments for the OP_Column opcodes used by the

indexed expression optimization.

FossilOrigin-Name: bf6d837fddbf74d5b3f40ad01ea4564edfac00b651d6f3f0e996cc5dc18bb06c

src/sqliteInt.h

@@ -3583,6 +3583,9 @@ struct IndexedExpr {
   int iIdxCol;            /* The index column that contains value of pExpr */
   u8 bMaybeNullRow;       /* True if we need an OP_IfNullRow check */
   IndexedExpr *pIENext;   /* Next in a list of all indexed expressions */
+#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
+  const char *zIdxName;   /* Name of index, used only for bytecode comments */
+#endif
 };
 
 /*