From 11c80d49e30a3d409db2b3dbee9d674068aa0b96 Mon Sep 17 00:00:00 2001
From: wangmm0220 <wangmm0220@gmail.com>
Date: Fri, 15 Oct 2021 11:20:05 +0800
Subject: [PATCH] TD-6129<feature> match/nmatch support for nchar

---
 src/tsdb/src/tsdbRead.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 1e230dad49..8e11e44567 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -4088,8 +4088,8 @@ static FORCE_INLINE int32_t tsdbGetJsonTagDataFromId(void *param, int32_t id, ch
     *data = TABLE_NAME(pTable);
   } else {
     void* jsonData = getJsonTagValue(pTable, name, TSDB_MAX_JSON_KEY_MD5_LEN, NULL);
-    assert(jsonData != NULL);
-    jsonData += CHAR_BYTES;   // jump type
+    // jsonData == NULL for ? operation
+    if(jsonData != NULL); jsonData += CHAR_BYTES;   // jump type
     *data = jsonData;
   }
 
-- 
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