opensearch-project / opensearch-project/sql

[ENHANCEMENT] Refactor the ResourceMonitor with Calcite

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@LantaoJin is already working on this.

Since Aug 25, 2025.

calcite enhancement maintenance
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Description

#3454 added a ResourceMonitor with Calcite (v3)

The non-intrusive decorator approach in V2 may be better for safeguarding additional operators in the future and also give Spark the flexibility to bypass it if needed—especially when unifying the physical index scan operator in the PPL-Spark integration.

Refactor it by adding a wrapper physical operator as a decorator. It requires

  1. adding user-defined Calcite logical plan (related to https://github.com/opensearch-project/sql/issues/3329)
  2. corresponding physical operator generator rule and decorator physical operator.

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