[SPARK-23377][ML] Fixes Bucketizer with multiple columns persistence bug#20594

Closed

viirya wants to merge 3 commits intoapache:masterfrom

viirya:SPARK-23377-2

Commits on Feb 13, 2018

Remove outputCol default value if inputCols is set.
viirya
committed

Commits on Feb 14, 2018

Choose to skip default of outputCol when saving metadata.
viirya
committed

Commits on Feb 15, 2018

Address comments.
viirya
committed