diff --git a/src/query/inc/qFilter.h b/src/query/inc/qFilter.h
index 73f86f3ff3fda95d6707a5d4e05e6255e92a5af2..33a526fec54283e8e6c1884b1e1da7570ee1f29d 100644
--- a/src/query/inc/qFilter.h
+++ b/src/query/inc/qFilter.h
@@ -188,6 +188,7 @@ typedef struct SFilterInfo {
 #define FILTER_GET_FIELD(i, id) (&((i)->fields[(id).type].fields[(id).idx]))
 #define FILTER_GET_COL_FIELD(i, idx) (&((i)->fields[FLD_TYPE_COLUMN].fields[idx]))
 #define FILTER_GET_COL_FIELD_TYPE(fi) (((SSchema *)((fi)->desc))->type)
+#define FILTER_GET_COL_FIELD_SIZE(fi) (((SSchema *)((fi)->desc))->bytes)
 #define FILTER_GET_COL_FIELD_DESC(fi) ((SSchema *)((fi)->desc))
 #define FILTER_GET_COL_FIELD_DATA(fi, ri) ((fi)->data + ((SSchema *)((fi)->desc))->bytes * (ri))
 #define FILTER_GET_VAL_FIELD_TYPE(fi) (((tVariant *)((fi)->desc))->nType)
diff --git a/src/query/src/qFilter.c b/src/query/src/qFilter.c
index 8c55b7fd94805bc5b584178ce6c1490b619a459e..8f1530551c513e41347b01e81569704d89406426 100644
--- a/src/query/src/qFilter.c
+++ b/src/query/src/qFilter.c
@@ -1815,7 +1815,31 @@ _err_return:
 }
 
 
-int32_t filterConverNcharColumns(SFilterInfo* pFilterInfo, int32_t rows, bool *gotNchar) {
+int32_t filterConverNcharColumns(SFilterInfo* info, int32_t rows, bool *gotNchar) {
+  for (uint16_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);
+    if (type == TSDB_DATA_TYPE_NCHAR) {
+      SFilterField nfi = {0};
+      nfi.desc = fi->desc;
+      int32_t bytes = FILTER_GET_COL_FIELD_SIZE(fi);
+      nfi.data = malloc(rows * bytes);
+      int32_t bufSize = bytes - VARSTR_HEADER_SIZE;
+      for (int32_t j = 0; j < rows; ++j) {
+        char *src = FILTER_GET_COL_FIELD_DATA(fi, j);
+        char *dst = FILTER_GET_COL_FIELD_DATA(&nfi, j);
+        int32_t len = 0;
+        taosMbsToUcs4(varDataVal(src), varDataLen(src), varDataVal(dst), bufSize, &len);
+        varDataLen(dst) = len;
+      }
+
+      fi->data = nfi.data;
+      
+      *gotNchar = true;
+    }
+  }
+
+
 #if 0
   for (int32_t i = 0; i < numOfFilterCols; ++i) {
     if (pFilterInfo[i].info.type == TSDB_DATA_TYPE_NCHAR) {
@@ -1837,7 +1861,7 @@ int32_t filterConverNcharColumns(SFilterInfo* pFilterInfo, int32_t rows, bool *g
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t filterFreeNcharColumns(SFilterInfo* pFilterInfo) {
+int32_t filterFreeNcharColumns(SFilterInfo* info) {
 #if 0
   for (int32_t i = 0; i < numOfFilterCols; ++i) {
     if (pFilterInfo[i].info.type == TSDB_DATA_TYPE_NCHAR) {
@@ -1850,6 +1874,15 @@ int32_t filterFreeNcharColumns(SFilterInfo* pFilterInfo) {
   }
 #endif
 
+  for (uint16_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);
+    if (type == TSDB_DATA_TYPE_NCHAR) {
+      tfree(fi->data);
+    }
+  }
+
+
   return TSDB_CODE_SUCCESS;
 }
 
diff --git a/tests/script/general/parser/condition.sim b/tests/script/general/parser/condition.sim
index 54e64c01dce3906fb7856bd12ba00118dbabf942..d414cb15540e287cff3be4d67c1a52902eb6d4e6 100644
--- a/tests/script/general/parser/condition.sim
+++ b/tests/script/general/parser/condition.sim
@@ -1200,6 +1200,31 @@ sql select * from stb1 where c1 is null and c2 is null and ts > '2021-05-05 18:1
 if $rows != 0 then
   return -1
 endi
+
+sql select * from stb1 where c1 is null and c1 > 0;
+if $rows != 0 then
+  return -1
+endi
+
+sql select * from stb1 where c1 is null or c1 is not null or c1 > 1;
+if $rows != 29 then
+  return -1
+endi
+
+sql select * from stb1 where (c1 is null or c1 > 40) and c1 < 44;
+if $rows != 3 then
+  return -1
+endi
+if $data00 != @21-05-05 18:19:16.000@ then
+  return -1
+endi
+if $data10 != @21-05-05 18:19:17.000@ then
+  return -1
+endi
+if $data20 != @21-05-05 18:19:18.000@ then
+  return -1
+endi
+
 sql select * from stb1 where c1 = 3 or c1 = 5 or c1 >= 44 and c1 <= 52;
 if $rows != 4 then
   return -1
@@ -1738,6 +1763,20 @@ if $data20 != @21-05-05 18:19:03.000@ then
   return -1
 endi
 
+sql select * from (select * from stb1 where c2 > 10 and c6 < 40) where c9 in ('11','21','31');
+if $rows != 3 then
+  return -1
+endi
+if $data00 != @21-05-05 18:19:04.000@ then
+  return -1
+endi
+if $data10 != @21-05-05 18:19:08.000@ then
+  return -1
+endi
+if $data20 != @21-05-05 18:19:12.000@ then
+  return -1
+endi
+
 
 print "ts test"
 sql_error select ts,c1,c7 from stb1 where ts != '2021-05-05 18:19:27'
@@ -2036,6 +2075,26 @@ if $data50 != @21-05-05 18:19:14.000@ then
   return -1
 endi
 
+sql select ts,c1,c2,c8 from (select * from stb1) where (ts <= '2021-05-05 18:19:03.000' or ts > '2021-05-05 18:19:26.000' or ts = '2021-05-05 18:19:26.000') and ts != '2021-05-05 18:19:03.000' and ts != '2021-05-05 18:19:26.000';
+if $rows != 5 then
+  return -1
+endi
+if $data00 != @21-05-05 18:19:00.000@ then
+  return -1
+endi
+if $data10 != @21-05-05 18:19:01.000@ then
+  return -1
+endi
+if $data20 != @21-05-05 18:19:02.000@ then
+  return -1
+endi
+if $data30 != @21-05-05 18:19:27.000@ then
+  return -1
+endi
+if $data40 != @21-05-05 18:19:28.000@ then
+  return -1
+endi
+
 print "tbname test"
 sql_error select * from stb1 where tbname like '%3' and tbname like '%4';