GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/19021
[SPARK-21603][SQL][FOLLOW-UP] Change the default value of
maxLinesPerFunction into 4000
## What changes were proposed in this pull request?
This pr changed the default value of `maxLinesPerFunction` into `4000`. In
#18810, we had this new option to disable code generation for too long
functions and I found this option only affected `Q17` and `Q66` in TPC-DS. But,
`Q66` had some performance regression:
```
Q17 w/o #18810, 3224ms --> q17 w/#18810, 2627ms (improvement)
Q66 w/o #18810, 1712ms --> q66 w/#18810, 3032ms (regression)
```
To keep the previous performance in TPC-DS, we better set higher value at
`maxLinesPerFunction` by default.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark SPARK-21603-FOLLOWUP-1
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19021.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 #19021
----
commit d0bc6a62cd58147c9809d9c99fd4452cf7e40aff
Author: Takeshi Yamamuro <[email protected]>
Date: 2017-08-22T08:05:29Z
Change the default value of maxLinesPerFunction into 4000
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