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Posted to issues@flink.apache.org by "godfrey he (JIRA)" <ji...@apache.org> on 2017/10/11 09:33:00 UTC

[jira] [Updated] (FLINK-7802) Exception occur when empty field collection was pushed into TableSource

     [ https://issues.apache.org/jira/browse/FLINK-7802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

godfrey he updated FLINK-7802:
------------------------------
    Summary: Exception occur  when empty field collection was pushed into TableSource  (was: Error occur  when empty field collection was pushed into TableSource)

> Exception occur  when empty field collection was pushed into TableSource
> ------------------------------------------------------------------------
>
>                 Key: FLINK-7802
>                 URL: https://issues.apache.org/jira/browse/FLINK-7802
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API & SQL
>            Reporter: godfrey he
>            Assignee: godfrey he
>
> Currently, if no fields will be used, empty field collection will be pushed into TableSource in PushProjectIntoTableSourceScanRule. Some exception will occur, e.g. java.lang.IllegalArgumentException: At least one field must be specified   at org.apache.flink.api.java.io.RowCsvInputFormat.<init>(RowCsvInputFormat.java:50)
> Consider such SQL: select count(1) from tbl. 
> So if no fields will be used, we should also keep some columns for TableSource to read some data.



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