cube-js/cube

RedshiftDriver support UNLOAD (exportBucket) in readOnly mode

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#3,032 opened on Jun 30, 2021

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 (2 comments) (1 reaction) (0 assignees)Rust (1,965 forks)batch import
driver:redshifthelp wanted

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Description

Hello!

We started to support UNLOAD (exportBucket) in Redshift driver, but it's still limited and there are no support for readOnly mode.

Why?

Because We need column types for CSV, without it it's not possible to create a table in an external storage. In readOnly mode we dont create table before extraction and use original SQL, but there is no good way to do it.

Solution:

  1. SELECT query with LIMIT 0 to extract types.
  2. CREATE TEMP table and describe it via INFORMATION_SCHEMA.

Thanks

Contributor guide

Research direction
Investigate how readOnly mode currently handles queries without table creation, and explore methods to extract column types using LIMIT 0 or INFORMATION SCHEMA.
Tech stack
rust
Domain
backenddatabaseapi
Issue type
Feature
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.
1-2 days
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.
Mostly clear
Prerequisites
SQLRedshift
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50