[SPARK-23819][SQL] Fix InMemoryTableScanExec complex type pruning#20935

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pwoody wants to merge 6 commits intoapache:masterfrom

pwoody:pw/fixColumnStats

Commits on Mar 29, 2018

SPARK-23819: InMemoryTableScanExec prunes orderable complex types due to out of date ColumnStats
Patrick Woody
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Fix null types
Patrick Woody
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Commits on Mar 30, 2018

Merge branch 'master' of https://github.com/apache/spark
Patrick Woody
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Commits on Mar 31, 2018

Add copying for unsafe data structures
Patrick Woody
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Commits on Apr 1, 2018

pr feedback
Patrick Woody
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extra test make Map orderable safe
Patrick Woody
committed