GitHub user dilipbiswal opened a pull request:
https://github.com/apache/spark/pull/15642
[SPARK-18009][SQL] Fix ClassCastException while calling toLocalIterator()
on dataframe produced by RunnableCommand
## What changes were proposed in this pull request?
A short code snippet that uses toLocalIterator() on a dataframe produced by
a RunnableCommand
reproduces the problem. toLocalIterator() is called by thriftserver when
`spark.sql.thriftServer.incrementalCollect`is set to handle large queries
producing large result
set.
**Before**
```SQL
scala> spark.sql("show databases")
res0: org.apache.spark.sql.DataFrame = [databaseName: string]
scala> res0.toLocalIterator()
16/10/26 03:00:24 ERROR Executor: Exception in task 0.0 in stage 0.0 (TID 0)
java.lang.ClassCastException:
org.apache.spark.sql.catalyst.expressions.GenericInternalRow cannot be cast to
org.apache.spark.sql.catalyst.expressions.UnsafeRow
```
**After**
```SQL
scala> spark.sql("drop database databases")
res30: org.apache.spark.sql.DataFrame = []
scala> spark.sql("show databases")
res31: org.apache.spark.sql.DataFrame = [databaseName: string]
scala> res31.toLocalIterator().asScala foreach println
[default]
[parquet]
```
(Please explain how this patch was tested. E.g. unit tests, integration
tests, manual tests)
Added a test in DDLSuite
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dilipbiswal/spark SPARK-18009
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15642.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 #15642
----
commit 5ea4b956eb78815c525eb62f2dc14fecf5a3a066
Author: Dilip Biswal <dbis...@us.ibm.com>
Date: 2016-10-26T10:04:42Z
[SPARK-18008] Fix ClassCastException while calling toLocalIterator() on
dataframe produced by RunnableCommand
----
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