GitHub user gengliangwang opened a pull request:
https://github.com/apache/spark/pull/19478
[SPARK-22263][SQL]Refactor deterministic as lazy value
## What changes were proposed in this pull request?
The method `deterministic` is frequently called in optimizer.
Refactor `deterministic` as lazy value, in order to avoid redundant
computations.
## How was this patch tested?
Unit test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gengliangwang/spark deterministicAsLazyVal
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19478.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 #19478
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commit bdeea55e607ad16d292efeb4059249918a6961c1
Author: Wang Gengliang <[email protected]>
Date: 2017-10-12T06:00:09Z
make deterministic lazy value to avoid redundant computation
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