leonardBang commented on a change in pull request #15326:
URL: https://github.com/apache/flink/pull/15326#discussion_r599196385



##########
File path: 
flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/runtime/stream/sql/TableSourceITCase.scala
##########
@@ -19,13 +19,15 @@
 package org.apache.flink.table.planner.runtime.stream.sql
 
 import org.apache.flink.api.scala._
+import org.apache.flink.core.testutils.FlinkMatchers.containsCause
+import org.apache.flink.table.api.TableException
 import org.apache.flink.table.api.bridge.scala._
 import org.apache.flink.table.planner.factories.TestValuesTableFactory
 import org.apache.flink.table.planner.runtime.utils.{StreamingTestBase, 
TestData, TestingAppendSink, TestingRetractSink}
 import org.apache.flink.table.planner.utils._
+import org.apache.flink.table.runtime.functions.scalar.SourceWatermarkFunction
 import org.apache.flink.table.utils.LegacyRowResource
 import org.apache.flink.types.Row
-

Review comment:
       minor: unnecessary change




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