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Commit 9081b9f9 authored by Cheng Lian's avatar Cheng Lian Committed by Michael Armbrust
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[SPARK-2189][SQL] Adds dropTempTable API 

This PR adds an API for unregistering temporary tables. If a temporary table has been cached before, it's unpersisted as well.

Author: Cheng Lian <lian.cs.zju@gmail.com>

Closes #3039 from liancheng/unregister-temp-table and squashes the following commits:

54ae99f [Cheng Lian] Fixes Scala styling issue
1948c14 [Cheng Lian] Removes the unpersist argument
aca41d3 [Cheng Lian] Ensures thread safety
7d4fb2b [Cheng Lian] Adds unregisterTempTable API
parent 06232d23
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