[SPARK-3537][SPARK-3914][SQL] Refines in-memory columnar table statistics#2860

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liancheng wants to merge 5 commits intoapache:masterfrom

liancheng:propagates-in-mem-stats

Commits on Oct 20, 2014

Adds more in-memory table statistics and propagates them properly
liancheng
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Commits on Oct 21, 2014

Commits on Oct 22, 2014

Restricts visibility of o.a.s.s.c.p.l.Statistics
liancheng
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