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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7426) Table API does not support null values in keys
Date Mon, 14 Aug 2017 08:53:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16125409#comment-16125409
] 

Aljoscha Krettek commented on FLINK-7426:
-----------------------------------------

I'm not sure, but implementing proper support for {{null}} in the DataStream API sounds like
it would take a bit longer.

> 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
>
> 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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