GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/11592
[SPARK-13242] [SQL] codegen fallback in case-when if there many branches
## What changes were proposed in this pull request?
If there are many branches in a CaseWhen expression, the generated code
could go above the 64K limit for single java method, will fail to compile. This
PR change it to fallback to interpret mode if there are more than 20 branches.
## How was this patch tested?
Add a test with 50 branches.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark fix_when
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11592.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 #11592
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commit aace0a3a0006c2b40a3b678a5d51ca0001ecda1f
Author: Davies Liu <[email protected]>
Date: 2016-03-09T00:06:09Z
fallback in case-when
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