databendlabs/databend

tracking: postgres-compatible number `to_char` function

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#16,524 opened on Sep 26, 2024

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C-testinggood first issue

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Description

Summary #16480 https://www.postgresql.org/docs/current/functions-formatting.html

  • Data type: int8, int16, int32, int64 #16507
  • Data type: float, double #16507
  • Data type: decimal32, decimal64
  • Reuse parsed FmtCacheEntry
  • Pattern: 9/0/./,/PR/MI/PL/SG/EEEE/literal #16507
  • Pattern S/L/D/G without locale #16569
  • Locale Support
  • Pattern: RN Roman numeral (input between 1 and 3999) #19501
  • Pattern: TH or th ordinal number suffix
  • Pattern: V shift specified number of digits
  • more test
  • doc

Contributor guide

Research direction
Identify an unchecked subtask (e.g., decimal32/64 support) and examine existing implementations of number formatting functions in the codebase, such as the implementation for int8/float, to understand the pattern.
Tech stack
rustsql
Domain
database
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Over 1 week
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
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15