From fca20668f56fe712b4806ce3414d3bffef2a9248 Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Sat, 3 Dec 2022 23:52:38 +0800
Subject: [PATCH] fix(query): check for 0 tables in tsdbreader

---
 source/dnode/vnode/src/tsdb/tsdbRead.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 25b6fc2a9a..fece5df28e 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -3960,6 +3960,9 @@ static bool doTsdbNextDataBlock(STsdbReader* pReader) {
   blockDataCleanup(pBlock);
 
   SReaderStatus* pStatus = &pReader->status;
+  if (taosHashGetSize(pStatus->pTableMap) == 0){
+    return false;
+  }
 
   if (pStatus->loadFromFile) {
     int32_t code = buildBlockFromFiles(pReader);
@@ -3977,8 +3980,6 @@ static bool doTsdbNextDataBlock(STsdbReader* pReader) {
     buildBlockFromBufferSequentially(pReader);
     return pBlock->info.rows > 0;
   }
-
-  return false;
 }
 
 bool tsdbNextDataBlock(STsdbReader* pReader) {
-- 
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