GitHub user chenghao-intel opened a pull request:
https://github.com/apache/spark/pull/2368
[SPARK3501] [SQL] Fix the bug of Hive SimpleUDF creates unnecessary type
cast
When do the query like:
```
select datediff(cast(value as timestamp), cast('2002-03-21 00:00:00' as
timestamp)) from src;
```
SparkSQL will raise exception:
```
[info] scala.MatchError: TimestampType (of class
org.apache.spark.sql.catalyst.types.TimestampType$)
[info] at
org.apache.spark.sql.catalyst.expressions.Cast.castToTimestamp(Cast.scala:77)
[info] at
org.apache.spark.sql.catalyst.expressions.Cast.cast$lzycompute(Cast.scala:251)
[info] at
org.apache.spark.sql.catalyst.expressions.Cast.cast(Cast.scala:247)
[info] at
org.apache.spark.sql.catalyst.expressions.Cast.eval(Cast.scala:263)
[info] at
org.apache.spark.sql.catalyst.optimizer.ConstantFolding$$anonfun$apply$5$$anonfun$applyOrElse$2.applyOrElse(Optimizer.scala:217)
[info] at
org.apache.spark.sql.catalyst.optimizer.ConstantFolding$$anonfun$apply$5$$anonfun$applyOrElse$2.applyOrElse(Optimizer.scala:210)
[info] at
org.apache.spark.sql.catalyst.trees.TreeNode.transformDown(TreeNode.scala:144)
[info] at
org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$4$$anonfun$apply$2.apply(TreeNode.scala:180)
[info] at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
[info] at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/chenghao-intel/spark cast_exception
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/2368.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 #2368
----
commit 9bb678c54e2a7d9c822bdfef05a15722969109e1
Author: Cheng Hao <hao.ch...@intel.com>
Date: 2014-09-12T04:51:00Z
Fix the bug of timestamp cast to timestamp failure
----
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