lsyldliu commented on code in PR #19709:
URL: https://github.com/apache/flink/pull/19709#discussion_r873677386


##########
flink-table/flink-table-planner/src/test/scala/org/apache/flink/table/planner/codegen/HashCodeGeneratorTest.scala:
##########
@@ -18,18 +18,26 @@
 package org.apache.flink.table.planner.codegen
 
 import org.apache.flink.configuration.Configuration
-import org.apache.flink.table.data.GenericRowData
-import org.apache.flink.table.types.logical.{BigIntType, IntType, RowType, 
VarBinaryType}
+import org.apache.flink.table.data.{GenericArrayData, GenericMapData, 
GenericRowData, StringData}
+import org.apache.flink.table.types.logical.{ArrayType, BigIntType, IntType, 
MapType, MultisetType, RowType, VarBinaryType, VarCharType}
 
-import org.junit.{Assert, Test}
+import org.junit.{Assert, Rule, Test}
+import org.junit.rules.ExpectedException
+
+import scala.collection.JavaConversions.mapAsJavaMap
 
 /** Test for [[HashCodeGenerator]]. */
 class HashCodeGeneratorTest {
 
   private val classLoader = Thread.currentThread().getContextClassLoader
 
+  var expectedException: ExpectedException = ExpectedException.none

Review Comment:
   I have add an ITCase about array type in group by clause.



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