typelevel / typelevel/doobie

create constant temporary table out of a meta instance

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#916 1 comment 0 reactions 0 assignees View on GitHub

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Dominant language
Scala
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Description

Postgress allows creation of constant (temporary) tables for use in queries with this syntax:

WITH names (id, name) AS (VALUES (1, 'ABC'), (2, 'BCD')) 
  SELECT id FROM names

or the inlined version:

SELECT id FROM (VALUES (1, 'ABC'), (2, 'BCD')) AS t (id, name);

assuming I have an instance of a Meta[T], is there a way of writing a generic function that takes NonEmptyList[T] and creates me a table of T values.

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Research direction

No files, tests, or entry points are identified. Start by locating the PostgreSQL-specific SQL construction and the Meta[T] abstractions, then determine whether a generic NonEmptyList[T] table representation can fit the existing API. Done would mean a decided API design with coverage for the shown VALUES forms.

Written by the indexing model from the issue text.

Assessment

Tech stack
postgresql, scala
Domain
databases
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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