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From "godfrey he (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-7802) Bug in PushProjectIntoTableSourceScanRule when empty field collection was pushed into TableSource
Date Wed, 11 Oct 2017 03:34:00 GMT
godfrey he created FLINK-7802:
---------------------------------

             Summary: Bug in PushProjectIntoTableSourceScanRule 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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