prestodb/presto

Warn about global window functions (without partition by)

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#22,000 opened on Feb 25, 2024

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 (3 comments) (0 reactions) (0 assignees)Java (5,240 forks)batch import
Query Optimizationbootcampgood first issueoptimizer

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Description

They could be slow so good to warn users to instead cross join the result which works better

Contributor guide

Research direction
Find where window function validation occurs in Presto's codebase (likely in the analyzer or planner) and add a warning when a window function is used without a PARTITION BY clause.
Tech stack
java
Domain
backenddatabasedistributed systems
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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
JavaGitSQL
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70