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https://issues.apache.org/jira/browse/FLINK-7426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16207172#comment-16207172
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ASF GitHub Bot commented on FLINK-7426:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/4732
> Table API does not support null values in keys
> ----------------------------------------------
>
> Key: FLINK-7426
> URL: https://issues.apache.org/jira/browse/FLINK-7426
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 1.3.2
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Blocker
> Fix For: 1.4.0, 1.3.3
>
>
> The Table API uses {{keyBy}} internally, however, the generated
> {{KeySelector}} uses instances of {{Tuple}}. The {{TupleSerializer}} is not
> able to serialize null values. This causes issues during checkpointing or
> when using the RocksDB state backend. We need to replace all {{keyBy}} calls
> with a custom {{RowKeySelector}}.
> {code}
> class AggregateITCase extends StreamingWithStateTestBase {
> private val queryConfig = new StreamQueryConfig()
> queryConfig.withIdleStateRetentionTime(Time.hours(1), Time.hours(2))
> @Test
> def testDistinct(): Unit = {
> val env = StreamExecutionEnvironment.getExecutionEnvironment
> env.setStateBackend(getStateBackend)
> val tEnv = TableEnvironment.getTableEnvironment(env)
> StreamITCase.clear
> val t = StreamTestData.get3TupleDataStream(env).toTable(tEnv, 'a, 'b, 'c)
> .select('b, Null(Types.LONG)).distinct()
> val results = t.toRetractStream[Row](queryConfig)
> results.addSink(new StreamITCase.RetractingSink).setParallelism(1)
> env.execute()
> val expected = mutable.MutableList("1,null", "2,null", "3,null",
> "4,null", "5,null", "6,null")
> assertEquals(expected.sorted, StreamITCase.retractedResults.sorted)
> }
> {code}
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