Gang Tim Liu created HIVE-3958:
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Summary: support partial scan for analyze command
Key: HIVE-3958
URL: https://issues.apache.org/jira/browse/HIVE-3958
Project: Hive
Issue Type: Improvement
Reporter: Gang Tim Liu
Assignee: Gang Tim Liu
analyze commands allows us to collect statistics on existing tables/partitions.
It works great but might be slow since it scans all files.
There are 2 ways to speed it up:
1. collect stats without file scan. It may not collect all stats but good and
fast enough for use case. Hive-3917 addresses it
2. collect stats via partial file scan. It doesn't scan all content of files
but part of it to get file metadata. some examples are
https://cwiki.apache.org/Hive/rcfilecat.html for RCFile, ORC ( HIVE-3874 ) and
HFile of Hbase
This jira is targeted to address the #2
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