godfrey he created FLINK-7802:
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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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