From 3b2d5f74ed2d7a34dc2d05154da0353265201029 Mon Sep 17 00:00:00 2001
From: lichuang <lichuang1982@gmail.com>
Date: Mon, 17 May 2021 14:29:36 +0800
Subject: [PATCH] [TD-4034]check if STColumn is NULL,then ignore cache NULL
 column

---
 src/tsdb/src/tsdbMemTable.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/tsdb/src/tsdbMemTable.c b/src/tsdb/src/tsdbMemTable.c
index e1f6625ffa..1321d43653 100644
--- a/src/tsdb/src/tsdbMemTable.c
+++ b/src/tsdb/src/tsdbMemTable.c
@@ -993,6 +993,10 @@ static void updateTableLatestColumn(STsdbRepo *pRepo, STable *pTable, SDataRow r
     }
 
     STColumn *pTCol = schemaColAt(pSchema, j);
+    if (pTCol == NULL) {
+      // since schema maybe changed, check if STColumn NULL then ignore
+      continue;
+    }
     SDataCol *pDataCol = &(pLatestCols[j]);
     void* value = tdGetRowDataOfCol(row, (int8_t)pTCol->type, TD_DATA_ROW_HEAD_SIZE + pSchema->columns[j].offset);
     if (isNullN(value, pTCol->type)) {
-- 
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