From a96f99369225eb82f74632257944d79170b6901a Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Thu, 17 Sep 2020 10:06:12 +0800
Subject: [PATCH] [td-1442]

---
 src/client/src/tscSQLParser.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 517fb32bb3..d52faff4a5 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -6242,6 +6242,12 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
     }
 
     if (pQueryInfo->intervalTime > 0 && pQueryInfo->intervalTimeUnit != 'n' && pQueryInfo->intervalTimeUnit != 'y') {
+      // to avoid data overflow
+      bool initialWindows = TSWINDOW_IS_EQUAL(pQueryInfo->window, TSWINDOW_INITIALIZER);
+      if (initialWindows) {
+        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg6);
+      }
+
       int64_t timeRange = ABS(pQueryInfo->window.skey - pQueryInfo->window.ekey);
       // number of result is not greater than 10,000,000
       if ((timeRange == 0) || (timeRange / pQueryInfo->intervalTime) > MAX_INTERVAL_TIME_WINDOW) {
-- 
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