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Commit 659fd9d0 authored by Sean Owen's avatar Sean Owen Committed by Reynold Xin
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[SPARK-4819] Remove Guava's "Optional" from public API

Replace Guava `Optional` with (an API clone of) Java 8 `java.util.Optional` (edit: and a clone of Guava `Optional`)

See also https://github.com/apache/spark/pull/10512

Author: Sean Owen <sowen@cloudera.com>

Closes #10513 from srowen/SPARK-4819.
parent 553fd7b9
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