From 6376cf2f98ead79ad66aa5b047cfe36afae06da5 Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Thu, 25 Feb 2021 17:39:46 +0800
Subject: [PATCH] [td-3009] <fix>: diff can not be applied to unsigned numeric
 data type.

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

diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index fabaa166e2..9e8e780af7 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -2023,6 +2023,8 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t col
 
       if (!IS_NUMERIC_TYPE(colType)) {
         return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
+      } else if (IS_UNSIGNED_NUMERIC_TYPE(colType) && optr == TK_DIFF) {
+        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg10);
       }
 
       int16_t resultType = 0;