GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/10987
[SPARK-13093][SQL] improve null check in nullSafeCodeGen for unary, binary
and ternary expression
The current implementation is sub-optimal:
* If an expression is always nullable, e.g. `Unhex`, we can still remove
null check for children if they are not nullable.
* If an expression has some non-nullable children, we can still remove null
check for these children and keep null check for others.
This PR improves this by making the null check elimination more
fine-grained.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark null-check
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10987.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 #10987
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commit dca28a0d9ccc32aaf059e56cd8503c5667e1fa7f
Author: Wenchen Fan <[email protected]>
Date: 2016-01-29T20:01:49Z
improve nullSafeCodeGen for unary, binary and ternary expression
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