PARQUET-1485: Fix Snappy direct memory leak#581

Merged

gszadovszky merged 8 commits intoapache:masterfrom

liupc:Fix-Snappy-direct-memory-leak

Feb 12, 2019

Commits on Jan 2, 2019

Fix direct memory leak
Liupengcheng
committed

Commits on Feb 9, 2019

Use reflection for cleaning DirectBuffer to fix java9+ incompatibility
liupengcheng
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Add CleanUtil
liupengcheng
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Update log and Refine initial buffer size
liupengcheng
committed

Commits on Feb 10, 2019

Fix OutputBuffer should be empty check
liupengcheng
committed

Commits on Feb 11, 2019

Updated as comment
liupengcheng
committed
Minor fix
liupengcheng
committed
Return immediately when cleanerField or cleanMethod is null
liupengcheng
committed