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https://issues.apache.org/jira/browse/FLINK-3498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15173502#comment-15173502
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ASF GitHub Bot commented on FLINK-3498:
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GitHub user twalthr opened a pull request:
https://github.com/apache/flink/pull/1747
[FLINK-3498] Implement TRIM, SUBSTRING as reference design for Table API
This PR implements `TRIM` and `SUBSTRING` for the Table API. It generalizes
all calls to the expression `Call` which allows to add functions easier and
override functions later. `TRIM` is an example for a special function as it
uses some symbols like `BOTH`, `LEADING` etc. and special syntax.
After this PR has been merged, I would continue with this design for
FLINK-3497.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/twalthr/flink scalarFunctions1
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1747.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 #1747
----
commit 7f7383d51959d1d2f8ecfdbcb8d454db06af9858
Author: twalthr <[email protected]>
Date: 2016-03-01T09:24:41Z
[FLINK-3498] Implement TRIM, SUBSTRING as reference design for Table API
----
> Implement TRIM, SUBSTRING as reference design for Table API
> -----------------------------------------------------------
>
> Key: FLINK-3498
> URL: https://issues.apache.org/jira/browse/FLINK-3498
> Project: Flink
> Issue Type: Sub-task
> Components: Table API
> Reporter: Timo Walther
> Assignee: Timo Walther
>
> As described in FLINK-3497 TRIM and SUBSTRING are the first scalar functions
> implemented in Calcite and used in Table API.
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