[ASTERIXDB-2611] Some aggregation queries fail when some partitions are empty

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.9.4
• Fix Version/s: 0.9.5
• Component/s: RT - Runtime
• Assignee: Ali Alsuliman
• Reporter: Ali Alsuliman
• Created: 12/Jul/19 07:41
• Updated: 13/Aug/19 01:27
• Resolved: 13/Aug/19 01:27

Description

The below query fails if some partitions are empty. The cause is that the aggregator for empty partitions does not get the chance to produce a proper output because the nested plan pipeline is not opened.

USE TinySocial;
WITH t AS 1
SELECT count(`friend-ids`), t
FROM FacebookUsers;