GitHub user xueyumusic opened a pull request:
https://github.com/apache/flink/pull/6282
[FLINK-6847][FLINK-6813][Table Api & Sql] TimestampDiff table api and sql
support
## What is the purpose of the change
This PR propose to add TimestampDiff sql and table Api.
Sql format is like `TIMESTAMP(DAY, DATE '2018-07-03', DATE '2018-07-04')`,
was explained and based on https://github.com/apache/flink/pull/4117
Table Api signature is like `timestampDiff(TimeIntervalUnit.DAY,
'2018-07-03'.toDate, '2018-07-04'.toDate)`
## Brief change log
- *modify `generateTemporalPlusMinus` in `ScalarOperators.scala` to
support sql code gen*
- *add `timestampDiff` api in `time.scala`*
- *add timestampDiff expr string parse in `ExpressionParser.scala`*
## Verifying this change
This change added tests and can be verified as follows:
*(example:)*
- *add tests to verify sql and table api, in various types combine of
unit(YEAR, MONTH...SECOND) and datetime(DATE or TIMESTAMP)*
- *add validation tests *
## 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)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (yes)
- If yes, how is the feature documented? (docs / JavaDocs)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/xueyumusic/flink timestampDiff
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/6282.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 #6282
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commit 462060f8854d19a355bcf4cc2fd54a2200f3e35b
Author: xueyu <278006819@...>
Date: 2018-07-08T10:50:06Z
timestampDiff table api and sql
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