From 8e7381d70e56afcb17cb161bf34040e68890d742 Mon Sep 17 00:00:00 2001
From: lichuang <lichuang1982@gmail.com>
Date: Mon, 10 May 2021 10:14:44 +0800
Subject: [PATCH] free lastRow while cacheLastRow config reset

---
 src/tsdb/src/tsdbMemTable.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/tsdb/src/tsdbMemTable.c b/src/tsdb/src/tsdbMemTable.c
index 776cc07d2f..c6fcf55686 100644
--- a/src/tsdb/src/tsdbMemTable.c
+++ b/src/tsdb/src/tsdbMemTable.c
@@ -967,6 +967,15 @@ static void tsdbFreeRows(STsdbRepo *pRepo, void **rows, int rowCounter) {
 static int tsdbUpdateTableLatestInfo(STsdbRepo *pRepo, STable *pTable, SDataRow row) {
   STsdbCfg *pCfg = &pRepo->config;
 
+  // if cacheLastRow config has been reset, free the lastRow
+  if (!pCfg->cacheLastRow && pTable->lastRow != NULL) {
+    taosTZfree(pTable->lastRow);
+    TSDB_WLOCK_TABLE(pTable);
+    pTable->lastRow = NULL;
+    pTable->lastKey = TSKEY_INITIAL_VAL;
+    TSDB_WUNLOCK_TABLE(pTable);
+  }
+
   if (tsdbGetTableLastKeyImpl(pTable) < dataRowKey(row)) {
     if (pCfg->cacheLastRow || pTable->lastRow != NULL) {
       SDataRow nrow = pTable->lastRow;
-- 
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