[PARQUET-74] Use thread local decoder cache in Binary toStringUsingUTF8()

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Fix Version/s: 1.6.0
• Component/s: parquet-mr
• Assignee: Zhenxiao Luo
• Reporter: Zhenxiao Luo
• Created: 20/Aug/14 19:33
• Updated: 07/Apr/15 20:45
• Resolved: 28/Aug/14 21:20

Description

In Binary toStringUsingUTF8(), new String(...) is slower because it instantiates a new Decoder, while Charset#decode uses a thread-local decoder cache, it is much faster.

ByteArraySliceBackedBinary is using Charset#decode, while, ByteArrayBackedBinary and ByteBufferBackedBinary are still using new String()

Issue Links

• duplicates: PARQUET-75 String decode using 'new String' is slow