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Commit de28e4d4 authored by Reynold Xin's avatar Reynold Xin
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[SPARK-11973][SQL] Improve optimizer code readability.

This is a followup for https://github.com/apache/spark/pull/9959.

I added more documentation and rewrote some monadic code into simpler ifs.

Author: Reynold Xin <rxin@databricks.com>

Closes #9995 from rxin/SPARK-11973.
parent ad765623
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