pingcap/tidb

Percentile Function in Tidb

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#46,985 opened on Sep 14, 2023

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compatibility-oraclegood first issuesig/executiontype/compatibilitytype/feature-request

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Description

Bug Report

perncentile on a column is not working SELECT PERCENTILE_CONT(0.75) WITHIN GROUP (ORDER BY column_name) OVER () AS Q3 FROM YourTable; This is the query which is supported in both postgresql and mysql but it is throwing an error in TIDB

2. What did you expect to see? (Required)

result

3. What did you see instead (Required)

You have an error in your SQL syntax; check the manual that corresponds to your TiDB version for the right syntax to use line 2 column 41 near "(ORDER BY _org_unit_id) OVER () AS Q1

4. What is your TiDB version? (Required)

7.3.0

Contributor guide

Research direction
Investigate the implementation of PERCENTILE CONT in TiDB's SQL parser and function registry. Check if the function is missing or if there is a syntax error in the parser.
Tech stack
gosql
Domain
database
Issue type
Bug
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.
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
SQLGo
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50