[DRILL-7311] Partial fixes for empty batch bugs

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 1.16.0
• Fix Version/s: 1.18.0
• Assignee: Paul Rogers
• Reporter: Paul Rogers
• Created: 01/Jul/19 01:20
• Updated: 30/Nov/19 03:09
• Resolved: 30/Nov/19 03:09

Description

DRILL-7305 explains that multiple operators have serious bugs when presented with empty batches. DRILL-7306 explains that the EVF (AKA "new scan framework") was originally coded to emit an empty "fast schema" batch, but that the feature was disabled because of the many empty-batch operator failures.

This ticket covers a set of partial fixes for empty-batch issues. This is the result of work done to get the converted JSON reader to work with a "fast schema." The JSON work, in the end, revealed that Drill has too many bugs to enable fast schema, and so the DRILL-7306 was implemented instead.

Issue Links

• duplicates: DRILL-7324 Many vector-validity errors from unit tests