[CALCITE-2964] testEmptyFilterProjectUnion fails when copyPorject is disabled in FilterProjectTransposeRule

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Bug
• Component/s: core
• Assignee: Unassigned
• Reporter: Haisheng Yuan
• Created: 30/Mar/19 23:51
• Updated: 01/Apr/19 05:36
• Resolved: 01/Apr/19 05:36

Description

Changing

public static final FilterProjectTransposeRule INSTANCE =
      new FilterProjectTransposeRule(Filter.class, Project.class, true, true,
          RelFactories.LOGICAL_BUILDER);

to

public static final FilterProjectTransposeRule INSTANCE =
      new FilterProjectTransposeRule(Filter.class, Project.class, true, false,
          RelFactories.LOGICAL_BUILDER);

will cause testEmptyFilterProjectUnion plan diff:

LogicalProject(X=[$0], Y=[$1])
  LogicalUnion(all=[true])
    LogicalFilter(condition=[>(+($0, $1), 30)])
      LogicalValues(tuples=[[{ 10, 1 }, { 30, 3 }]])
    LogicalFilter(condition=[>(+($0, $1), 30)])
      LogicalValues(tuples=[[{ 20, 2 }]])

The expected plan is:

LogicalProject(X=[$0], Y=[$1])
  LogicalValues(tuples=[[{ 30, 3 }]])

I am assuming it will generate the same plan no matter copyFilter/copyProject is on or off. Is this wrong assumption?