astronomy-commons/hats-tap

Translate ADQL's `BETWEEN` to appropriate Python

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#17 opened on Dec 2, 2025

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enhancementgood first issue

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Description

Feature request

SELECT * FROM ppdb.DiaObject WHERE r_psfFluxMean BETWEEN 1090.0 and 1100.0

can be translated to

compute(ppdb.query("1090.0 <= r_psfFluxMean <= 1100.0"))

or

ppdb.open_catalog(..., filters=[('r_psfFluxMean', '>=', 1090), ('r_psfFluxMean', '<=', 1100)])
compute(ppdb)

At present, the second version is what the translator supports, but the Python "between" operator could be used once we have implemented the ability to translate to .query(). In either case, the translator needs to attach logic to the BETWEEN event.

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  • I have described the purpose of the suggested change, specifying what I need the enhancement to accomplish, i.e. what problem it solves.
  • I have included any relevant links, screenshots, environment information, and data relevant to implementing the requested feature, as well as pseudocode for how I want to access the new functionality.
  • If I have ideas for how the new feature could be implemented, I have provided explanations and/or pseudocode and/or task lists for the steps.

Contributor guide

Research direction
Implement the BETWEEN operator translation in the ADQL to Python translator. Study existing logic for other operators and add handling for BETWEEN in the appropriate AST visitor or grammar rule. Ensure both the .query() and filters approaches are supported.
Tech stack
pythonsql
Domain
backend
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
PythonSQL
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70