From 837701752cdb64de3af4b3d9ddc78897bd0db5e4 Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Tue, 10 Nov 2020 10:32:43 +0800
Subject: [PATCH] [TD-225]

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

diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 554b67acea..a96f764ea0 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -2314,12 +2314,13 @@ void filterPrepare(void* expr, void* param) {
 
   if (pInfo->optr == TSDB_RELATION_IN) {
     pInfo->q = (char*) pCond->arr;
-  } else {
+  } else if (pCond != NULL) {
     uint32_t size = pCond->nLen * TSDB_NCHAR_SIZE;
     if (size < (uint32_t)pSchema->bytes) {
       size = pSchema->bytes;
     }
-    pInfo->q = calloc(1, size + TSDB_NCHAR_SIZE);   // to make sure tonchar does not cause invalid write, since the '\0' needs at least sizeof(wchar_t) space.
+
+    pInfo->q = calloc(1, size + TSDB_NCHAR_SIZE);  // to make sure tonchar does not cause invalid write, since the '\0' needs at least sizeof(wchar_t) space.
     tVariantDump(pCond, pInfo->q, pSchema->type, true);
   }
 }
-- 
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