Maryann Xue created CALCITE-1499:
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Summary: Add an option to exclude VolcanoPlanner's "originalRoot"
from planning process
Key: CALCITE-1499
URL: https://issues.apache.org/jira/browse/CALCITE-1499
Project: Calcite
Issue Type: Improvement
Components: core
Affects Versions: 1.10.0
Reporter: Maryann Xue
Assignee: Maryann Xue
The Calcite compilation framework runs a series of Programs for query planning.
The default programs consist of some pre-processing HepPrograms, e.g.,
de-correlation, field-trimming, etc., the volcano planning program, and some
post-processing HepPrograms. In {{Prepare.optimize()}}, {{planner.setRoot()}}
is called before running the programs. As a result, the original rel from
sql-to-rel conversion becomes the "originalRoot" in the VolcanoPlanner, and the
new rel from the pre-processing programs becomes the new "root". In some cases,
we would only want to run volcano planning on the new root based on the
assumption that the new root is the desired form after pre-processing. And if
we have an option to turn off the planning of the original root, the planning
space can be significantly reduced.
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