Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/4061#discussion_r121278080
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/catalog/ExternalTableSourceUtilTest.scala
---
@@ -42,7 +42,7 @@ class ExternalTableSourceUtilTest {
val schema = new TableSchema(Array("foo"),
Array(BasicTypeInfo.INT_TYPE_INFO))
val table = ExternalCatalogTable("mock", schema)
val tableSource =
ExternalTableSourceUtil.fromExternalCatalogTable(table)
- assertTrue(tableSource.isInstanceOf[StreamTableSourceTable[_]])
+ assertTrue(tableSource.isInstanceOf[TableSourceTable[_]])
--- End diff --
I think checking the result of `fromExternalCatalogTable` is a
`TableSourceTable` is meaningless now (it definitely returns a
`TableSourceTable`). I suggest to check whether the `TableSource` in the
`TableSourceTable` is a `StreamTableSource`.
```
assertTrue(tableSource.tableSource.isInstanceOf[StreamTableSource[_]])
```
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