Julian Hyde created CALCITE-1524:
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Summary: Add a project to the planner root so that rules know
which output fields are used
Key: CALCITE-1524
URL: https://issues.apache.org/jira/browse/CALCITE-1524
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
Add a project to the planner root so that rules know which output fields are
used.
One such rule is {{SemiJoinRule}}; it can only apply if it knows that no fields
are used from the right-hand input, so it has to match a {{Project}} at the
root of its pattern.
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