Github user sunjincheng121 commented on a diff in the pull request:
https://github.com/apache/flink/pull/3791#discussion_r113836005
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/table.scala
---
@@ -417,12 +452,33 @@ class Table(
private def join(right: Table, joinPredicate: Option[Expression],
joinType: JoinType): Table = {
// check that right table belongs to the same TableEnvironment
--- End diff --
// check that the TableEnvironment of right table is not null and right
table belongs to the same TableEnvironment
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