[PARQUET-1759] InternalParquetRecordReader Use Singleton Set

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.12.0
• Labels: pull-request-available
• Assignee: David Mollitor
• Reporter: David Mollitor
• Created: 12/Jan/20 15:47
• Updated: 25/Feb/20 13:25
• Resolved: 25/Feb/20 13:25

Description

https://github.com/apache/parquet-mr/blob/d85a8f5dcfc1381655fcccaa81a2e83ba812f6a4/parquet-hadoop/src/main/java/org/apache/parquet/hadoop/InternalParquetRecordReader.java#L260-L262

Code currently instantiates a HashSet (with a default internal data structure of size 16}} and then makes it immutable. Use Collection#singleton to achieve this same goal with fewer lines of code and less memory requirements.

Issue Links

• links to: GitHub Pull Request #743