Github user twdsilva commented on the issue:
https://github.com/apache/phoenix/pull/423
The PR adds ```PhoenixDataSource``` which implements the new [DataSourceV2
API](https://issues.apache.org/jira/browse/SPARK-15689). This will allow
further optimizations in the future such as limit and aggregate pushdown, see
[SPARK-22386](https://issues.apache.org/jira/browse/SPARK-22386)
```PhoenixSparkIT``` and ```PhoenixSparkITTenantSpecific``` were converted
to use this API.
```PhoenixRelation``` and related classes that implemented the old API were
deprecated.
I also bumped up the spark version to 2.4.0 and set the java source and
target version to 1.8 for the maven-compiler-plugin.
@jmahonin can you please review?
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