GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/10435
[SPARK-12480][SQL] add Hash expression that can calculate hash value for a
group of expressions
The hash algorithm is based on hive's bucketing hash function, see
https://github.com/apache/hive/blob/release-1.2.0/ql/src/java/org/apache/hadoop/hive/ql/exec/ReduceSinkOperator.java#L421-L423
and
https://github.com/apache/hive/blob/release-1.2.0/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/ObjectInspectorUtils.java#L497-L607
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark hash-expr
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10435.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 #10435
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commit 53b0ec57947130b56d374708b03cb706ab21c0ae
Author: Wenchen Fan <[email protected]>
Date: 2015-12-22T15:22:59Z
add hash expression
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