From 7311d5343d590a60b3f6f0dc993c4180b96e4390 Mon Sep 17 00:00:00 2001
From: wangmm0220 <wangmm0220@gmail.com>
Date: Tue, 9 Nov 2021 17:04:22 +0800
Subject: [PATCH] add json->'key'=null support

---
 src/client/src/tscSQLParser.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 5befd5f33a..627fb240c3 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -4731,7 +4731,7 @@ static int32_t handleExprInQueryCond(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, tSql
     if (pRight->tokenId == TK_NULL && (*pExpr)->tokenId == TK_EQ) {
       // transform for json->'key'=null
       pRight->tokenId = TK_STRING;
-      pRight->value.nType = TSDB_DATA_TYPE_BINARY;
+      pRight->value.nType = TSDB_DATA_TYPE_NCHAR;
       pRight->value.nLen = INT_BYTES;
       pRight->value.pz = calloc(INT_BYTES, 1);
       *(uint32_t*)pRight->value.pz = TSDB_DATA_JSON_null;
-- 
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