GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/21230
[SPARK-24172][SQL] we should not apply operator pushdown to data source v2
many times
## What changes were proposed in this pull request?
In `PushDownOperatorsToDataSource`, we use `transformUp` to match
`PhysicalOperation` and apply pushdown. This is problematic if we have multiple
`Filter` and `Project` above the data source v2 relation.
e.g. for a query
```
Project
Filter
DataSourceV2Relation
```
The pattern match will be triggered twice and we will do operator pushdown
twice. This is unnecessary, we can use `transformDown` to only apply pushdown
once.
## How was this patch tested?
existing test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark step2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21230.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 #21230
----
commit e224f8a798ed30319efab386720c997227e1b421
Author: Wenchen Fan <wenchen@...>
Date: 2018-05-03T15:14:01Z
we should not apply operator pushdown to data source v2 many times
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