GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/11406
[SPARK-13527] [SQL] Prune Filters based on Constraints
#### What changes were proposed in this pull request?
Remove all the deterministic conditions in a [[Filter]] that are contained
in the Child's Constraints.
For example, the first query can be simplified to the second one.
```scala
val queryWithUselessFilter = tr1
.where("tr1.a".attr > 10 || "tr1.c".attr < 10)
.join(tr2.where('d.attr < 100), Inner, Some("tr1.a".attr ===
"tr2.a".attr))
.where(
("tr1.a".attr > 10 || "tr1.c".attr < 10) &&
'd.attr < 100 &&
"tr2.a".attr === "tr1.a".attr)
```
```scala
val query = tr1
.where("tr1.a".attr > 10 || "tr1.c".attr < 10)
.join(tr2.where('d.attr < 100), Inner, Some("tr1.a".attr ===
"tr2.a".attr))
```
#### How was this patch tested?
Six test cases are added.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark FilterRemoval
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11406.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 #11406
----
commit c0caaea10993e5a74c09278461aac1c0a470411c
Author: gatorsmile <[email protected]>
Date: 2016-02-27T03:06:35Z
Merge remote-tracking branch 'upstream/master' into FilterRemoval
commit e50d307ad7d3347b66938f267a601ea67107f563
Author: gatorsmile <[email protected]>
Date: 2016-02-27T03:07:08Z
prune Filter based on Constraints
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