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[SPARK-14796][SQL] Add spark.sql.optimizer.inSetConversionThreshold c…
…onfig option. ## What changes were proposed in this pull request? Currently, `OptimizeIn` optimizer replaces `In` expression into `InSet` expression if the size of set is greater than a constant, 10. This issue aims to make a configuration `spark.sql.optimizer.inSetConversionThreshold` for that. After this PR, `OptimizerIn` is configurable. ```scala scala> sql("select a in (1,2,3) from (select explode(array(1,2)) a) T").explain() == Physical Plan == WholeStageCodegen : +- Project [a#7 IN (1,2,3) AS (a IN (1, 2, 3))#8] : +- INPUT +- Generate explode([1,2]), false, false, [a#7] +- Scan OneRowRelation[] scala> sqlContext.setConf("spark.sql.optimizer.inSetConversionThreshold", "2") scala> sql("select a in (1,2,3) from (select explode(array(1,2)) a) T").explain() == Physical Plan == WholeStageCodegen : +- Project [a#16 INSET (1,2,3) AS (a IN (1, 2, 3))#17] : +- INPUT +- Generate explode([1,2]), false, false, [a#16] +- Scan OneRowRelation[] ``` ## How was this patch tested? Pass the Jenkins tests (with a new testcase) Author: Dongjoon Hyun <dongjoon@apache.org> Closes #12562 from dongjoon-hyun/SPARK-14796.
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