pengzhiwei2018 commented on a change in pull request #1138: [CALCITE-1581] UDTF 
like in hive
URL: https://github.com/apache/calcite/pull/1138#discussion_r314567970
 
 

 ##########
 File path: core/src/main/java/org/apache/calcite/sql2rel/SqlToRelConverter.java
 ##########
 @@ -3948,6 +3950,30 @@ private void convertSelectList(
     }
   }
 
+  /**
+   * Convert the table function in select to Join or TableFunctionScan.
+   * @param bb       Blackboard
+   * @param select   SqlSelect
+   * */
+  private void convertTableFunctionInSelect(Blackboard bb, SqlSelect select) {
+    SqlBasicCall tableFunction = validator.getTableFunctionInSelect(select);
+    // rewrite the table function if select list contain one
+    if (tableFunction != null) {
 
 Review comment:
   If select cotains a table function, It will be converted to a join.

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