Merge pull request #1227 from taosdata/feature/lihui

[#1197]

src/client/src/tscSQLParser.c

@@ -1655,7 +1655,7 @@ int32_t addExprAndResultField(SQueryInfo* pQueryInfo, int32_t colIdx, tSQLExprIt
             SSchema* pSchema = tsGetSchema(pMeterMetaInfo->pMeterMeta);
 
             // functions can not be applied to tags
-            if (index.columnIndex >= pMeterMetaInfo->pMeterMeta->numOfColumns) {
+            if ((index.columnIndex >= pMeterMetaInfo->pMeterMeta->numOfColumns) || (index.columnIndex < 0)) {
               return invalidSqlErrMsg(pQueryInfo->msg, msg6);
             }
 
@@ -5663,4 +5663,4 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
 bool hasDefaultQueryTimeRange(SQueryInfo *pQueryInfo) {
   return (pQueryInfo->stime == 0 && pQueryInfo->etime == INT64_MAX) ||
          (pQueryInfo->stime == INT64_MAX && pQueryInfo->etime == 0);
-}
\ No newline at end of file
+}