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https://issues.apache.org/jira/browse/FLINK-7802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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godfrey he updated FLINK-7802:
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Summary: Exception occur when empty field collection was pushed into
CSVTableSource (was: Exception occur when empty field collection was pushed
into TableSource)
> Exception occur when empty field collection was pushed into CSVTableSource
> --------------------------------------------------------------------------
>
> 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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