GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/21966
simplify codegen of array_except
## What changes were proposed in this pull request?
simplify the codegen:
1. only do real codegen if the type can be specialized by the hash set
2. change the null handling. Before: track the nullElementIndex, and create
a new ArrayData to insert the null in the middle. After: track the
nullElementIndex, put a null placeholder in the ArrayBuilder, at the end create
ArrayData from ArrayBuilder directly.
## How was this patch tested?
existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark minor2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21966.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 #21966
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commit 313ad294ec07d54f06db92f635b6bb9a76f17343
Author: Wenchen Fan <wenchen@...>
Date: 2018-08-02T09:18:21Z
simplify codegen of array_except
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