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feat: support common subexpression elimination #18821

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feat: support common subexpression elimination #18821

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@SkyFan2002 SkyFan2002 commented Oct 5, 2025 •
edited by drmingdrmer
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I hereby agree to the terms of the CLA available at: https://docs.databend.com/dev/policies/cla/

Summary

Complex queries often contain repeated or similar subexpressions. Evaluating each common subexpression once and reusing its result may speed up execution.

WIP...

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  • Unit Test
  • Logic Test
  • Benchmark Test
  • No Test - Explain why

Type of change

  • Bug Fix (non-breaking change which fixes an issue)
  • New Feature (non-breaking change which adds functionality)
  • Breaking Change (fix or feature that could cause existing functionality not to work as expected)
  • Documentation Update
  • Refactoring
  • Performance Improvement
  • Other (please describe):

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@github-actions github-actions bot added the pr-feature this PR introduces a new feature to the codebase label Oct 5, 2025
@SkyFan2002 SkyFan2002 added ci-cloud Build docker image for cloud test and removed pr-feature this PR introduces a new feature to the codebase labels Oct 5, 2025
@github-actions github-actions bot added the pr-feature this PR introduces a new feature to the codebase label Oct 5, 2025
@SkyFan2002 SkyFan2002 added ci-cloud Build docker image for cloud test and removed ci-cloud Build docker image for cloud test labels Oct 5, 2025
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github-actions bot commented Oct 5, 2025

Docker Image for PR

  • tag: pr-18821-867d227-1759653842

note: this image tag is only available for internal use.

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github-actions bot commented Oct 5, 2025

Docker Image for PR

  • tag: pr-18821-ee5fbde-1759654495

note: this image tag is only available for internal use.

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