[SPARK-5193] Make Spark SQL API usable in Java and remove the Java-specific API

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.0
• Component/s: SQL
• Target Version/s: 1.3.0
• Assignee: Reynold Xin
• Reporter: Reynold Xin
• Created: 11/Jan/15 09:14
• Updated: 17/Jan/15 05:09
• Resolved: 17/Jan/15 05:09

Description

Java version of the SchemaRDD API causes high maintenance burden for Spark SQL itself and downstream libraries (e.g. MLlib pipeline API needs to support both JavaSchemaRDD and SchemaRDD). We can audit the Scala API and make it usable for Java, and then we can remove the Java specific version.

Things to remove include (Java version of):

• data type
• Row
• SQLContext
• HiveContext

Things to consider:

• Scala and Java have a different collection library.
• Scala and Java (8) have different closure interface.
• Scala and Java can have duplicate definitions of common classes, such as BigDecimal.

Issue Links

• is blocked by: SPARK-5123 Stabilize Spark SQL data type API
• links to: [Github] Pull Request #4049 (rxin)
• links to: [Github] Pull Request #4054 (rxin)
• links to: [Github] Pull Request #4056 (rxin)
• links to: [Github] Pull Request #4065 (rxin)