From a69bd8fc3f07ff376b3f47bde08664e845d2af64 Mon Sep 17 00:00:00 2001
From: shenglian zhou <slzhou@taosdata.com>
Date: Tue, 11 Jan 2022 14:57:09 +0800
Subject: [PATCH] (query):when all or empty result, no need to convert wcs to
 ucs for filter

---
 src/query/src/qFilter.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/query/src/qFilter.c b/src/query/src/qFilter.c
index 6869017e11..9afd9609ee 100644
--- a/src/query/src/qFilter.c
+++ b/src/query/src/qFilter.c
@@ -3585,6 +3585,10 @@ _return:
 
 
 int32_t filterConverNcharColumns(SFilterInfo* info, int32_t rows, bool *gotNchar) {
+  if (FILTER_EMPTY_RES(info) || FILTER_ALL_RES(info)) {
+    return TSDB_CODE_SUCCESS;
+  }
+  
   for (uint32_t i = 0; i < info->fields[FLD_TYPE_COLUMN].num; ++i) {
     SFilterField* fi = &info->fields[FLD_TYPE_COLUMN].fields[i];
     int32_t type = FILTER_GET_COL_FIELD_TYPE(fi);
-- 
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