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## What changes were proposed in this pull request? This PR introduces the necessary Maven modules for the new [Spark Graph](https://issues.apache.org/jira/browse/SPARK-25994) feature for Spark 3.0. * `spark-graph` is a parent module that users depend on to get all graph functionalities (Cypher and Graph Algorithms) * `spark-graph-api` defines the [Property Graph API](https://docs.google.com/document/d/1Wxzghj0PvpOVu7XD1iA8uonRYhexwn18utdcTxtkxlI) that is being shared between Cypher and Algorithms * `spark-cypher` contains a Cypher query engine implementation Both, `spark-graph-api` and `spark-cypher` depend on Spark SQL. Note, that the Maven module for Graph Algorithms is not part of this PR and will be introduced in https://issues.apache.org/jira/browse/SPARK-27302 A PoC for a running Cypher implementation can be found in this WIP PR https://github.com/apache/spark/pull/24297 ## How was this patch tested? Pass the Jenkins with all profiles and manually build and check the followings. ``` $ ls assembly/target/scala-2.12/jars/spark-cypher* assembly/target/scala-2.12/jars/spark-cypher_2.12-3.0.0-SNAPSHOT.jar $ ls assembly/target/scala-2.12/jars/spark-graph* | grep -v graphx assembly/target/scala-2.12/jars/spark-graph-api_2.12-3.0.0-SNAPSHOT.jar assembly/target/scala-2.12/jars/spark-graph_2.12-3.0.0-SNAPSHOT.jar ``` Closes #24490 from s1ck/SPARK-27300. Lead-authored-by: Martin Junghanns <martin.junghanns@neotechnology.com> Co-authored-by: Max Kießling <max@kopfueber.org> Co-authored-by: Martin Junghanns <martin.junghanns@neo4j.com> Co-authored-by: Dongjoon Hyun <dhyun@apple.com> Signed-off-by: Dongjoon Hyun <dhyun@apple.com> |
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