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Commit 9cdd867d authored by Davies Liu's avatar Davies Liu Committed by Davies Liu
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[SPARK-13373] [SQL] generate sort merge join

## What changes were proposed in this pull request?

Generates code for SortMergeJoin.

## How was the this patch tested?

Unit tests and manually tested with TPCDS Q72, which showed 70% performance improvements (from 42s to 25s), but micro benchmark only show minor improvements, it may depends the distribution of data and number of columns.

Author: Davies Liu <davies@databricks.com>

Closes #11248 from davies/gen_smj.
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