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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2828) Add interfaces for Table API input formats
Date Tue, 10 Nov 2015 17:26:11 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14998953#comment-14998953
] 

ASF GitHub Bot commented on FLINK-2828:
---------------------------------------

Github user twalthr commented on the pull request:

    https://github.com/apache/flink/pull/1237#issuecomment-155498508
  
    @aljoscha Do you think you'll find time this week for the PR? All Table API input formats
are waiting for it...


> Add interfaces for Table API input formats
> ------------------------------------------
>
>                 Key: FLINK-2828
>                 URL: https://issues.apache.org/jira/browse/FLINK-2828
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>
> In order to support input formats for the Table API, interfaces are necessary. I propose
two types of TableSources:
> - AdaptiveTableSources can adapt their output to the requirements of the plan. Although
the output schema stays the same, the TableSource can react on field resolution and/or predicates
internally and can return adapted DataSet/DataStream versions in the "translate" step.
> - StaticTableSources are an easy way to provide the Table API with additional input formats
without much implementation effort (e.g. for fromCsvFile())
> TableSources need to be deeply integrated into the Table API.
> The TableEnvironment requires a newly introduced AbstractExecutionEnvironment (common
super class of all ExecutionEnvironments for DataSets and DataStreams).
> Here's what a TableSource can see from more complicated queries:
> {code}
> getTableJava(tableSource1)
>   .filter("a===5 || a===6")
>   .select("a as a4, b as b4, c as c4")
>   .filter("b4===7")
>   .join(getTableJava(tableSource2))
>   .where("a===a4 && c==='Test' && c4==='Test2'")
> // Result predicates for tableSource1:
> //  List("a===5 || a===6", "b===7", "c==='Test2'")
> // Result predicates for tableSource2:
> //  List("c==='Test'")
> // Result resolved fields for tableSource1 (true = filtering, false=selection):
> //  Set(("a", true), ("a", false), ("b", true), ("b", false), ("c", false), ("c", true))
> // Result resolved fields for tableSource2 (true = filtering, false=selection):
> //  Set(("a", true), ("c", true))
> {code}



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