GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/20368
[SPARK-23195] [SQL] Keep the Hint of Cached Data
## What changes were proposed in this pull request?
The broadcast hint of the cached plan is lost if we cache the plan. This PR
is to correct it.
```Scala
val df1 = spark.createDataFrame(Seq((1, "4"), (2, "2"))).toDF("key",
"value")
val df2 = spark.createDataFrame(Seq((1, "1"), (2, "2"))).toDF("key",
"value")
broadcast(df2).cache()
df2.collect()
val df3 = df1.join(df2, Seq("key"), "inner")
```
## How was this patch tested?
Added a test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark cachedBroadcastHint
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20368.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 #20368
----
commit 21e5321d072c312e243407af08eeb9c1a796ab4d
Author: gatorsmile <gatorsmile@...>
Date: 2018-01-23T20:40:04Z
fix
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