GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/17273
[MINOR][CORE] No need to call `prunePartitions` in case of empty partition
## What changes were proposed in this pull request?
`PrunedInMemoryFileIndex.prunePartitions` shows `pruned NaN% partitions`
for the following case. We can improve that by checking the number of
partitions before calling `prunePartitions`.
```scala
scala> Seq.empty[(String, String)].toDF("a",
"p").write.partitionBy("p").saveAsTable("t1")
scala> sc.setLogLevel("INFO")
scala> spark.table("t1").filter($"p" === "1").select($"a").show
...
17/03/13 00:33:04 INFO PrunedInMemoryFileIndex: Selected 0 partitions out
of 0, pruned NaN% partitions.
```
## How was this patch tested?
Pass the Jenkins with the existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-EMPTY-PARTITION
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17273.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 #17273
----
commit 97a426d05480c447c7bae12f8ce6acc0282370a5
Author: Dongjoon Hyun <dongj...@apache.org>
Date: 2017-03-13T08:01:37Z
[MINOR][CORE] No need to call `prunePartitions` in case of empty partitions
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