fix:error in tag filter optimization

source/libs/executor/src/executil.c

@@ -433,8 +433,10 @@ static SColumnInfoData* getColInfoResult(void* metaHandle, uint64_t suid, SArray
         tagVal.cid = pColInfo->info.colId;
         const char* p = metaGetTableTagVal(tag, pColInfo->info.type, &tagVal);
 
-        if (p == NULL){
+        if (p == NULL || (pColInfo->info.type == TSDB_DATA_TYPE_JSON && ((STag*)p)->nTag == 0)){
           colDataAppend(pColInfo, i, p, true);
+        } else if (pColInfo->info.type == TSDB_DATA_TYPE_JSON) {
+          colDataAppend(pColInfo, i, p, false);
         } else if (IS_VAR_DATA_TYPE(pColInfo->info.type)) {
           char *tmp = taosMemoryMalloc(tagVal.nData + VARSTR_HEADER_SIZE);
           varDataSetLen(tmp, tagVal.nData);

tests/system-test/2-query/json_tag.py

@@ -216,7 +216,7 @@ class TDTestCase:
 
         # test where with json tag
         tdSql.query("select * from jsons1_1 where jtag is not null")
-        tdSql.query("select * from jsons1 where jtag='{\"tag1\":11,\"tag2\":\"\"}'")
+        tdSql.error("select * from jsons1 where jtag='{\"tag1\":11,\"tag2\":\"\"}'")
         tdSql.error("select * from jsons1 where jtag->'tag1'={}")
 
         # test json error