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From "sunjincheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6740) Fix "parameterTypeEquals" method error.
Date Sat, 27 May 2017 10:33:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16027394#comment-16027394
] 

sunjincheng commented on FLINK-6740:
------------------------------------

Hi [~fhueske] [~twalthr] Do you have some suggestions about this  JIRA.?

> Fix "parameterTypeEquals" method error.
> ---------------------------------------
>
>                 Key: FLINK-6740
>                 URL: https://issues.apache.org/jira/browse/FLINK-6740
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>    Affects Versions: 1.3.0
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>
> When we define UDTF as follows:
> {code}
> class TableFuncPojo extends TableFunction[TPojo] {
>   def eval(age: Int, name:String): Unit = {
>     collect(new TPojo(age.toLong,name))
>   }
>   def eval(age: Date, name:String): Unit = {
>       collect(new TPojo(age.getTime,name))
>   }
> }
> {code}
> TableAPI:
> {code}
>  val table = stream.toTable(tEnv,
>       'long2, 'int, 'double, 'float, 'bigdec, 'ts, 'date,'pojo, 'string, 'long.rowtime)
>     val windowedTable = table
>       .join(udtf('date, 'string) as 'pojo2).select('pojo2)
> {code}
> We will get the error as following:
> {code}
> org.apache.flink.table.api.ValidationException: Found multiple 'eval' methods which match
the signature.
> 	at org.apache.flink.table.functions.utils.UserDefinedFunctionUtils$.getUserDefinedMethod(UserDefinedFunctionUtils.scala:180)
> 	at org.apache.flink.table.plan.logical.LogicalTableFunctionCall.validate(operators.scala:700)
> 	at org.apache.flink.table.api.Table.join(table.scala:539)
> 	at org.apache.flink.table.api.Table.join(table.scala:328)
> 	at org.apache.flink.table.runtime.datastream.DataStreamAggregateITCase.test1(DataStreamAggregateITCase.scala:84)
> {code}
> The reason is in {{ parameterTypeEquals }} method, logical as follows:
> {code}
> candidate == classOf[Date] && (expected == classOf[Int] || expected == classOf[JInt])

> {code}
> TestData:
> {code}
> val data = List(
>     (1L, 1, 1d, 1f, new BigDecimal("1"),
>       new Timestamp(200020200),new Date(100101010),new TPojo(1L, "XX"),"Hi"),
>     (2L, 2, 2d, 2f, new BigDecimal("2"),
>       new Timestamp(200020200),new Date(100101010),new TPojo(1L, "XX"),"Hallo"),
>     (3L, 2, 2d, 2f, new BigDecimal("2"),
>       new Timestamp(200020200), new Date(100101010),new TPojo(1L, "XX"),"Hello"),
>     (4L, 5, 5d, 5f, new BigDecimal("5"),
>       new Timestamp(200020200), new Date(2334234),new TPojo(2L, "YY"),"Hello"),
>     (7L, 3, 3d, 3f, new BigDecimal("3"),
>       new Timestamp(200020200), new Date(666333333),new TPojo(1L, "XX"),"Hello"),
>     (8L, 3, 3d, 3f, new BigDecimal("3"),
>       new Timestamp(200020200), new Date(100101010),new TPojo(1L, "XX"),"Hello world"),
>     (16L, 4, 4d, 4f, new BigDecimal("4"),
>       new Timestamp(200020200), new Date(100101010),new TPojo(1L, "XX"),"Hello world"))
> {code}
> But when we only define one `eval` method, we got different result, as follows:
> {code}
> // for def eval(age: Int, name:String)
> Pojo{id=0, name='Hello'}
> Pojo{id=1, name='Hallo'}
> Pojo{id=1, name='Hello world'}
> Pojo{id=1, name='Hello world'}
> Pojo{id=1, name='Hello'}
> Pojo{id=1, name='Hi'}
> Pojo{id=8, name='Hello'}
> // for def eval(age: Date, name:String)
> Pojo{id=-28800000, name='Hello'}
> Pojo{id=57600000, name='Hallo'}
> Pojo{id=57600000, name='Hello world'}
> Pojo{id=57600000, name='Hello world'}
> Pojo{id=57600000, name='Hello'}
> Pojo{id=57600000, name='Hi'}
> Pojo{id=662400000, name='Hello'}
> {code}
> So, We should modify the logical of  {{ parameterTypeEquals }} method.
> What do you think? Welcome anybody feedback...



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