GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/20384
[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 test33
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20384.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 #20384
----
commit 4ef18b76b13c35dbec0d9e8ecfa753c9b4a80d2c
Author: gatorsmile <gatorsmile@...>
Date: 2018-01-24T15:27:52Z
fix
commit 3bbec210bcfd759d36a6f7e809ed0f1e3d0a03d8
Author: gatorsmile <gatorsmile@...>
Date: 2018-01-24T15:28:06Z
fix
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