Wayne Zhang f47700c9ca [SPARK-14659][ML] RFormula consistent with R when handling strings ... ## What changes were proposed in this pull request? When handling strings, the category dropped by RFormula and R are different: - RFormula drops the least frequent level - R drops the first level after ascending alphabetical ordering This PR supports different string ordering types in StringIndexer #17879 so that RFormula can drop the same level as R when handling strings using`stringOrderType = "alphabetDesc"`. ## How was this patch tested? new tests Author: Wayne Zhang <actuaryzhang@uber.com> Closes #17967 from actuaryzhang/RFormula.		2017-05-26 10:44:40 +08:00
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src	[SPARK-14659][ML] RFormula consistent with R when handling strings	2017-05-26 10:44:40 +08:00
pom.xml	[SPARK-20453] Bump master branch version to 2.3.0-SNAPSHOT	2017-04-24 21:48:04 -07:00