[HIVE-18528] Stats: In the bitvector codepath, when extrapolating column stats for String type columnStringColumnStatsAggregator uses the min value instead of max

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Component/s: Metastore
• Hadoop Flags: Reviewed
• Assignee: Vaibhav Gumashta
• Reporter: Vaibhav Gumashta
• Created: 24/Jan/18 22:09
• Updated: 01/Feb/18 19:52
• Resolved: 01/Feb/18 19:52

Description

This line: https://github.com/apache/hive/blob/456a65180dcb84f69f26b4c9b9265165ad16dfe4/standalone-metastore/src/main/java/org/apache/hadoop/hive/metastore/columnstats/aggr/StringColumnStatsAggregator.java#L181

Should be:
aggregateData.setAvgColLen(Math.max(aggregateData.getAvgColLen(), newData.getAvgColLen()));