Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3860#discussion_r115683748
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/utils/TestFilterableTableSource.scala
---
@@ -97,6 +98,15 @@ class TestFilterableTableSource(
override def isFilterPushedDown: Boolean = filterPushedDown
+ override def getTableStats: TableStats = {
--- End diff --
If we let the `FilterableTableSource` compute the cardinality, this
information will be lost if the source table has valid stats registered in the
`TableSourceTable`.
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