[ORC-569] Empty positions list in first row index entry

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.5.7, 1.6.1
• Fix Version/s: 1.5.8, 1.6.2, 1.7.0
• Assignee: Owen O'Malley
• Reporter: Owen O'Malley
• Created: 08/Nov/19 23:22
• Updated: 21/Apr/20 00:10
• Resolved: 14/Nov/19 05:28

Description

When writing string columns with orc.dictionary.key.threshold = 0 the first row group's position list is empty. This results in:

java.lang.IndexOutOfBoundsException: Index: 0

when the application uses predicate push down and selects the first row group.

Issue Links

• incorporates: ORC-621 Need reader fix for ORC-569
• is related to: HIVE-22480 IndexOutOfBounds exception while reading ORC files written with empty positions list in first row index entry
• links to: GitHub Pull Request #451