GitHub user bomeng opened a pull request:
https://github.com/apache/spark/pull/12739
[SPARK-14955] [SQL] avoid stride value equals to zero
## What changes were proposed in this pull request?
In the columnPartition() method of JDBCRelation, stride is used for
calculating the increment. But in some cases, this value could be zero, for
example, lowerBound=0, upperBound=7, numOfPartition=8, which put all the data
into one partition (last partition).
This fix will try to make stride calculation more robust. I have also added
require() to validate the input. equals() is added for overriding the parents
equals() method, together with hashCode().
I have also fixed some text style, make keywords all uppercase.
## How was this patch tested?
New test cases were added to JDBCSuite.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/bomeng/spark SPARK-14955
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12739.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 #12739
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commit b4df4b0626a4bab197eb249fea99283ba4afd293
Author: bomeng <bm...@us.ibm.com>
Date: 2016-04-27T18:31:28Z
fix stride
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