[BEAM-7049] Merge multiple input to one BeamUnionRel

• Type: Improvement
• Status: Open
• Priority: P3
• Resolution: Unresolved
• Component/s: dsl-sql
• Assignee: Unassigned
• Reporter: Rui Wang
• Created: 10/Apr/19 20:37
• Updated: 04/Jun/22 01:55

Description

BeamUnionRel assumes inputs are two and rejects more. So `a UNION b UNION c` will have to be created as UNION(a, UNION(b, c)) and have two shuffles. If BeamUnionRel can handle multiple shuffles, we will have only one shuffle

Issue Links

• links to: GitHub Pull Request #9358