fix bug

src/client/src/tscSQLParser.c

@@ -1540,7 +1540,7 @@ bool isValidDistinctSql(SQueryInfo* pQueryInfo) {
 int32_t parseSelectClause(SSqlCmd* pCmd, int32_t clauseIndex, tSQLExprList* pSelection, bool isSTable, bool joinQuery, bool intervalQuery) {
   assert(pSelection != NULL && pCmd != NULL);
 
-  const char* msg2 = "functions can not be mixed up";
+  const char* msg2 = "functions or others can not be mixed up";
   const char* msg3 = "not support query expression";
   const char* msg5 = "invalid function name";
   const char* msg6 = "only support distinct one tag";
@@ -2902,6 +2902,23 @@ bool hasUnsupportFunctionsForSTableQuery(SSqlCmd* pCmd, SQueryInfo* pQueryInfo)
   return false;
 }
 
+static bool groupbyTagsOrNull(SQueryInfo* pQueryInfo) {
+  if (pQueryInfo->groupbyExpr.columnInfo == NULL ||
+    taosArrayGetSize(pQueryInfo->groupbyExpr.columnInfo) == 0) {
+    return true;
+  }
+
+  size_t s = taosArrayGetSize(pQueryInfo->groupbyExpr.columnInfo);
+  for (int32_t i = 0; i < s; i++) {
+    SColIndex* colIndex = taosArrayGet(pQueryInfo->groupbyExpr.columnInfo, i);
+    if (colIndex->flag != TSDB_COL_TAG) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
 static bool functionCompatibleCheck(SQueryInfo* pQueryInfo, bool joinQuery, bool intervalQuery) {
   int32_t startIdx = 0;
 
@@ -2918,7 +2935,7 @@ static bool functionCompatibleCheck(SQueryInfo* pQueryInfo, bool joinQuery, bool
 
   int32_t factor = functionCompatList[tscSqlExprGet(pQueryInfo, startIdx)->functionId];
 
-  if (tscSqlExprGet(pQueryInfo, 0)->functionId == TSDB_FUNC_LAST_ROW && (joinQuery || intervalQuery)) {
+  if (tscSqlExprGet(pQueryInfo, 0)->functionId == TSDB_FUNC_LAST_ROW && (joinQuery || intervalQuery || !groupbyTagsOrNull(pQueryInfo))) {
     return false;
   }
 
@@ -2946,7 +2963,7 @@ static bool functionCompatibleCheck(SQueryInfo* pQueryInfo, bool joinQuery, bool
       }
     }
 
-    if (functionId == TSDB_FUNC_LAST_ROW && (joinQuery || intervalQuery)) {
+    if (functionId == TSDB_FUNC_LAST_ROW && (joinQuery || intervalQuery || !groupbyTagsOrNull(pQueryInfo))) {
       return false;
     }
   }

tests/script/general/parser/lastrow_query.sim

@@ -16,6 +16,9 @@ $stb = $stbPrefix . $i
 
 sql use $db
 
+print ========>TD-3231 last_row with group by column error
+sql_error select last_row(c1) from $stb group by c1;
+
 ##### select lastrow from STable with two vnodes, timestamp decreases from tables in vnode0 to tables in vnode1
 sql select last_row(*) from $stb
 if $rows != 1 then
@@ -224,4 +227,4 @@ sql create table tu(ts timestamp, k int)
 sql select last_row(*) from tu
 if $row != 0 then
   return -1
-endi
\ No newline at end of file
+endi