GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/17046
[SPARK-19691][SQL][BRANCH-2.1] Fix ClassCastException when calculating
percentile of decimal column
## What changes were proposed in this pull request?
This is a backport of the two following commits:
https://github.com/apache/spark/commit/93aa4271596a30752dc5234d869c3ae2f6e8e723
This pr fixed a class-cast exception below;
```
scala> spark.range(10).selectExpr("cast (id as decimal) as
x").selectExpr("percentile(x, 0.5)").collect()
java.lang.ClassCastException: org.apache.spark.sql.types.Decimal cannot be
cast to java.lang.Number
at
org.apache.spark.sql.catalyst.expressions.aggregate.Percentile.update(Percentile.scala:141)
at
org.apache.spark.sql.catalyst.expressions.aggregate.Percentile.update(Percentile.scala:58)
at
org.apache.spark.sql.catalyst.expressions.aggregate.TypedImperativeAggregate.update(interfaces.scala:514)
at
org.apache.spark.sql.execution.aggregate.AggregationIterator$$anonfun$1$$anonfun$applyOrElse$1.apply(AggregationIterator.scala:171)
at
org.apache.spark.sql.execution.aggregate.AggregationIterator$$anonfun$1$$anonfun$applyOrElse$1.apply(AggregationIterator.scala:171)
at
org.apache.spark.sql.execution.aggregate.AggregationIterator$$anonfun$generateProcessRow$1.apply(AggregationIterator.scala:187)
at
org.apache.spark.sql.execution.aggregate.AggregationIterator$$anonfun$generateProcessRow$1.apply(AggregationIterator.scala:181)
at
org.apache.spark.sql.execution.aggregate.ObjectAggregationIterator.processInputs(ObjectAggregationIterator.scala:151)
at
org.apache.spark.sql.execution.aggregate.ObjectAggregationIterator.<init>(ObjectAggregationIterator.scala:78)
at
org.apache.spark.sql.execution.aggregate.ObjectHashAggregateExec$$anonfun$doExecute$1$$anonfun$2.apply(ObjectHashAggregateExec.scala:109)
at
```
This fix simply converts catalyst values (i.e., `Decimal`) into scala ones
by using `CatalystTypeConverters`.
## How was this patch tested?
Added a test in `DataFrameSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark SPARK-19691-BACKPORT2.1
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17046.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 #17046
----
commit b8178d53fe63390c0512a3b6331b6d6c29dca9d6
Author: Takeshi Yamamuro <[email protected]>
Date: 2017-02-22T14:03:20Z
Fix ClassCastException
----
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