xzh_dz created CALCITE-4400:
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Summary: A tool method explain Calc operator
Key: CALCITE-4400
URL: https://issues.apache.org/jira/browse/CALCITE-4400
Project: Calcite
Issue Type: Wish
Reporter: xzh_dz
`Calc` is an operator combining `Project` and `Filter`. In a project
development, `Calc` operator is usually used to simplify the operator of
`Project` and `Filter`, and facilitate the optimization of relational algebra.
Usually, `Calc` operator is needed to process `Project` and `Filter`
information.Explain Calc operator is often needed in materialized view
recognition.A tool is needed to explain Calc to get `Project` (RexNodes) and
`Filter` (RexNode). In relation algebra optimization, it will be very
convenient to process `Calc` operator.
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