GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/10845
[SPARK-12904][SQL] Strength reduction for integer/decimal comparisons
JIRA: https://issues.apache.org/jira/browse/SPARK-12904
We can do the following strength reduction for comparisons between an
integral column and a decimal literal:
1. int_col > decimal_literal => int_col > floor(decimal_literal)
2. int_col >= decimal_literal => int_col >= ceil(decimal_literal)
3. int_col < decimal_literal => int_col < ceil(decimal_literal)
4. int_col <= decimal_literal => int_col <= floor(decimal_literal)
5. decimal_literal > int_col => ceil(decimal_literal) > int_col
6. decimal_literal >= int_col => floor(decimal_literal) >= int_col
7. decimal_literal < int_col => floor(decimal_literal) < int_col
8. decimal_literal <= int_col => ceil(decimal_literal) <= int_col
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 int-decimal-compare
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10845.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 #10845
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commit 5a96018c3d4ac193defc15ede6fbf91fe10a8f60
Author: Liang-Chi Hsieh <[email protected]>
Date: 2016-01-20T08:24:56Z
Strength reduction for integer/decimal comparisons.
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