[TAJO-1350] Refactor FilterPushDownRule::visitJoin() into well-defined, small methods

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.11.0
• Component/s: Planner/Optimizer
• Assignee: Jihoon Son
• Reporter: Hyunsik Choi
• Created: 15/Feb/15 23:33
• Updated: 14/Apr/15 11:00
• Resolved: 27/Mar/15 02:50

Description

FilterPushDownRule::visitJoin() is too long and complicated. It handles various cases in a single method. We need to refactor this method into several small and well-defined methods.

Issue Links

• contains: TAJO-1445 Optimizer removes some filter in where clause.
• is related to: TAJO-1310 Maintaining join filters in join operators
• relates to: TAJO-964 Scan filter was removed occasionally.
• relates to: TAJO-1445 Optimizer removes some filter in where clause.