databendlabs/databend

Feature: Optimize explain

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#17,660 opened on Mar 27, 2025

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C-featuregood first issue

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Description

Summary

There are a number of things that can be optimized about explain, such as

  • There is no way to see the datatype of an expression.
  • #17861
  • The window function of Sort in explain (LOGICAL) is not formatted.
  • update does not show children in explain (LOGICAL)
  • #17608
  • #17657

Contributor guide

Research direction
Investigate each listed optimization point, trace the explain code paths in the query engine, and implement the changes.
Tech stack
rustsql
Domain
backenddatabase
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
RustSQLGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40