Dongjoon Hyun 5de26194a3 [SPARK-14502] [SQL] Add optimization for Binary Comparison Simplification ... ## What changes were proposed in this pull request? We can simplifies binary comparisons with semantically-equal operands: 1. Replace '<=>' with 'true' literal. 2. Replace '=', '<=', and '>=' with 'true' literal if both operands are non-nullable. 3. Replace '<' and '>' with 'false' literal if both operands are non-nullable. For example, the following example plan ``` scala> sql("SELECT * FROM (SELECT explode(array(1,2,3)) a) T WHERE a BETWEEN a AND a+7").explain() ... : +- Filter ((a#59 >= a#59) && (a#59 <= (a#59 + 7))) ... ``` will be optimized into the following. ``` : +- Filter (a#47 <= (a#47 + 7)) ``` ## How was this patch tested? Pass the Jenkins tests including new `BinaryComparisonSimplificationSuite`. Author: Dongjoon Hyun <dongjoon@apache.org> Closes #12267 from dongjoon-hyun/SPARK-14502.		2016-04-11 09:52:50 -07:00
..
src	[SPARK-14502] [SQL] Add optimization for Binary Comparison Simplification	2016-04-11 09:52:50 -07:00
pom.xml	[SPARK-14211][SQL] Remove ANTLR3 based parser	2016-03-31 09:25:09 -07:00