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https://issues.apache.org/jira/browse/FLINK-7802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16201843#comment-16201843
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ASF GitHub Bot commented on FLINK-7802:
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GitHub user godfreyhe opened a pull request:
https://github.com/apache/flink/pull/4815
[FLINK-7802] [hotfix] Exception occur when empty field collection was
pushed into CSVTableSource
## What is the purpose of the change
*This pull request fix the bug: Exception occur when empty field collection
was pushed into CSVTableSource*
## Brief change log
- *Handle empty field collection in CSVTableSource when project push down*
## Verifying this change
This change added tests and can be verified as follows:
- *Add integration tests for SQL like: select count(1) from csv_table*
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (not documented)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/godfreyhe/flink FLINK-7802
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/4815.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #4815
----
commit 5694fb2fad223f733be9e92512f6534e0e3d37bb
Author: godfreyhe <[email protected]>
Date: 2017-10-12T11:12:47Z
[FLINK-7802] [hotfix] Exception occur when empty field collection was
pushed into CSVTableSource
----
> 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
>
> Consider such SQL: select count(1) from csv_table.
> When above SQL was executed, an exception will occur:
> java.lang.IllegalArgumentException: At least one field must be specified
> at
> org.apache.flink.api.java.io.RowCsvInputFormat.<init>(RowCsvInputFormat.java:50)
> So if no fields will be used, we should also keep some columns for
> CSVTableSource to get row count.
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