GitHub user chenghao-intel opened a pull request:
https://github.com/apache/spark/pull/7034
[SPARK-8653][SPARK-8245][SQL] Add DataTypeConstraint Support for Expression
Add Data Type Constraint Support for expression, this aim to merge the
function of
`Expression.checkInputDataTypes()` and the trait `ExpectsInputTypes`,
besides, also provide an opportunity for expression itself to do the proper
expression conversion, other than a general rule.
https://issues.apache.org/jira/browse/SPARK-8653
https://issues.apache.org/jira/browse/SPARK-8245
I enabled the feature in expression `Length` and `FormatNumber` for the
example, and probably more expressions will take that as enhancement.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/chenghao-intel/spark expression
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/7034.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 #7034
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commit f251638837b465003934b4759ad4d93c1d0d927e
Author: Cheng Hao <[email protected]>
Date: 2015-06-26T01:49:06Z
Add AcceptType and update the StringLength => Length
commit d233f995cae3a888660877165cc672bae9ef414d
Author: Cheng Hao <[email protected]>
Date: 2015-06-26T06:46:01Z
Add FormatNumber Support & the DataType Constraint
commit aa16d12eb451236b0a4692a08f593492119d4dee
Author: Cheng Hao <[email protected]>
Date: 2015-06-26T06:53:59Z
Update the comments accordingly
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