GitHub user cloud-fan reopened 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
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/rows.scala#L130-L158
Also use this expression in `Exchange`.
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 c8b0ea65b147c898467c00d551455abae74eddf0
Author: Wenchen Fan <[email protected]>
Date: 2015-12-22T15:22:59Z
add hash expression
commit 8a89287ed42aadde3d51d95c389ddb1e98c3ccf2
Author: Wenchen Fan <[email protected]>
Date: 2015-12-23T11:48:37Z
address comments
commit 1cdb2bcc1ede58fdd9c1e98bff4b5544b8a6e74e
Author: Wenchen Fan <[email protected]>
Date: 2015-12-24T01:28:54Z
fix hash code
commit 8703b1a127235c49614d326334548f125b81383b
Author: Wenchen Fan <[email protected]>
Date: 2015-12-30T01:58:54Z
add comment to explain the benefit of hash expression
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