GitHub user twalthr opened a pull request:
https://github.com/apache/flink/pull/1679
[FLINK-3226] Translation of scalar function substring()
This PR implements the scalar function `substring()` for the Table API on
Calcite. Additionally, it already contains preparations for more built-in SQL
functions. I implemented test utils for scalar functions `ScalarFunctionsTest`
and added a similar concept to Calcites `CallImplementor` named `CallGenerator`.
For now, I kept the `Substring` expression node, but I would like to remove
it and use a generic `Call` expression. I think we don't need a case class for
every operator. What do you think?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/twalthr/flink AdvancedOperators
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1679.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 #1679
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commit 0106e4723f38ab533bf15c909b98299e27530b2a
Author: twalthr <[email protected]>
Date: 2016-02-20T20:41:44Z
[FLINK-3226] Translation of scalar function substring()
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