Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3791#discussion_r114590580
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/table.scala
---
@@ -417,13 +507,45 @@ class Table(
}
private def join(right: Table, joinPredicate: Option[Expression],
joinType: JoinType): Table = {
- // check that right table belongs to the same TableEnvironment
- if (right.tableEnv != this.tableEnv) {
+ if (UserDefinedFunctionUtils.verifyTableFunctionCallExistence(this)) {
+ throw new ValidationException(
+ "TableFunctions can only be followed by Alias. e.g
table.join(split('c) as ('a, 'b))")
+ }
+
+ // check that the TableEnvironment of right table is not null
+ // and right table belongs to the same TableEnvironment
+ if (right.tableEnv != null && right.tableEnv != this.tableEnv) {
--- End diff --
I would change this method as follows:
first we check if `right` is a table function call. If no, we translate the
join as before. Otherwise, we translate it as a join with a table function.
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