Sarvesh Sakalanaga created HIVE-4727:
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Summary: Optimize ORC StringTreeReader::nextVector to not create
dictionary of strings for each call to nextVector
Key: HIVE-4727
URL: https://issues.apache.org/jira/browse/HIVE-4727
Project: Hive
Issue Type: Sub-task
Reporter: Sarvesh Sakalanaga
Assignee: Sarvesh Sakalanaga
Priority: Minor
Currently ORC StringTreeReader::nextVector creates dictionary of strings for
each call to nextVector. This leads to bad perf as there is huge memory
allocation and deallocation on each call. Since the dictionary does not change
within a stripe, StringTreeReader::nextVector should be optimized to create
this dictionary only on stripe read.
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