tree 4fc663bd4428595738d86ac2b1c871cab714fe17
parent 08209f47495c75c6acfbdd96691557d581943a25
author Matteo Minardi <minardi.matteo@hotmail.it> 1590861391 +0200
committer GitHub <noreply@github.com> 1590861391 -0700
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[CLEAN] Replace com.google.common.base.Optional with java.util.Optional

### Motivation

`com.google.common.base.Optional` and `java.util.Optional` exist in the code base at the same time.

### Changes
Replace `com.google.common.base.Optional` with `java.util.Optional`.


Reviewers: Enrico Olivelli <eolivelli@gmail.com>, Sijie Guo <None>, lamber-ken <None>

This closes #2346 from mino181295/merge-optional