[DRILL-7503] Refactor project operator

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.17.0
• Fix Version/s: 1.18.0
• Labels: ready-to-commit
• Assignee: Paul Rogers
• Reporter: Paul Rogers
• Reviewer: Igor Guzenko
• Created: 31/Dec/19 05:47
• Updated: 09/Jan/20 16:08
• Resolved: 09/Jan/20 16:08

Description

Work on another ticket revealed that the Project operator ("record batch") has grown quite complex. The setup phase lives in the operator as one huge function. The function combines the "logical" tasks of working out the projection expressions and types, the code gen for those expressions, and the physical setup of vectors.

The refactoring breaks up the logic so that it is easier to focus on the specific bits of interest.

Issue Links

• links to: GitHub Pull Request #1944