From 8993ce21647f00d029fdc6c7cf997f6a0c443cf2 Mon Sep 17 00:00:00 2001
From: xtcyclist <7731943+xtcyclist@users.noreply.github.com>
Date: Wed, 18 Jan 2023 00:25:19 +0800
Subject: [PATCH] report errors on where clauses in optional match queries.

---
 src/parser/parser.yy | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/parser/parser.yy b/src/parser/parser.yy
index 966e81c6f77..5f8d462cd5d 100644
--- a/src/parser/parser.yy
+++ b/src/parser/parser.yy
@@ -1682,7 +1682,11 @@ match_clause
         $$ = new MatchClause($2, $3, false/*optional*/);
     }
     | KW_OPTIONAL KW_MATCH match_path_list where_clause {
-        $$ = new MatchClause($3, $4, true);
+        if ($4 != nullptr) {
+            throw nebula::GraphParser::syntax_error(@4, "Where clause in optional match is not supported.");
+        } else {
+            $$ = new MatchClause($3, nullptr, true);
+        }
     }
     ;