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Commit 1a7d7cc8 authored by Michael Armbrust's avatar Michael Armbrust Committed by Reynold Xin
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[SPARK-2405][SQL] Reusue same byte buffers when creating new instance of InMemoryRelation 

Reuse byte buffers when creating unique attributes for multiple instances of an InMemoryRelation in a single query plan.

Author: Michael Armbrust <michael@databricks.com>

Closes #1332 from marmbrus/doubleCache and squashes the following commits:

4a19609 [Michael Armbrust] Clean up concurrency story by calculating buffersn the constructor.
b39c931 [Michael Armbrust] Allocations are kind of a side effect.
f67eff7 [Michael Armbrust] Reusue same byte buffers when creating new instance of InMemoryRelation
parent 7e26b576
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