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[Core] Compute-node only functions in Redshift like MEDIAN, etc. won't work with unit tests #5430

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dbeatty10 opened this issue May 2, 2024 · 0 comments · Fixed by #5508
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[Core] Compute-node only functions in Redshift like MEDIAN, etc. won't work with unit tests #5430

dbeatty10 opened this issue May 2, 2024 · 0 comments · Fixed by #5508
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content Improvements or additions to content dbt Core The changes proposed in this issue relate to dbt Core dbt-core v1.8 unit testing docs for 1.8 unit testing
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dbt Core v1.8 Doc...

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@dbeatty10
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Link to the page(s) on docs.getdbt.com requiring updates

Wherever we are documenting platform-specific caveats.

Possibly this page:
https://docs.getdbt.com/docs/build/unit-tests

Possibly this section:
https://docs.getdbt.com/docs/build/unit-tests#before-you-begin

Tell us more about this update

As noted in dbt-labs/dbt-redshift#807, certain functions in Redshift (MEDIAN, LISTAGG, etc.) don't currently work with dbt's built-in unit testing capabilities being introduced in v1.8.

The reason is that functions like MEDIAN are compute-node only functions and return an error if the query doesn't reference a user-defined table or Amazon Redshift system table.

Since dbt unit testing relies on CTE (rather than tables), models that contain any of these functions will fail with an error like:

[XX000] ERROR: One or more of the used functions must be applied on at least one user created tables. Examples of user table only functions are LISTAGG, MEDIAN, PERCENTILE_CONT, etc

Reviewers/Stakeholders/SMEs

.

Related GitHub issues

dbt-labs/dbt-redshift#807

Additional information

See internal Slack thread here:
https://dbt-labs.slack.com/archives/C05LRDBSCNL/p1714653471861229
@dbeatty10 dbeatty10 added content Improvements or additions to content dbt Core The changes proposed in this issue relate to dbt Core dbt-core v1.8 unit testing docs for 1.8 unit testing labels May 2, 2024
@dbeatty10 dbeatty10 changed the title [Core] <title> [Core] Compute-node only functions in Redshift like MEDIAN, etc. won't work with unit tests May 2, 2024
@matthewshaver matthewshaver mentioned this issue May 14, 2024
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matthewshaver added a commit that referenced this issue May 15, 2024
@matthewshaver
Redshift unit test limitation (#5508)
b390a97 
## What are you changing in this pull request and why?

Closes: #5430

## Checklist
<!--
Uncomment when publishing docs for a prerelease version of dbt:
- [ ] Add versioning components, as described in [Versioning
Docs](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-entire-pages)
- [ ] Add a note to the prerelease version [Migration
Guide](https://github.com/dbt-labs/docs.getdbt.com/tree/current/website/docs/docs/dbt-versions/core-upgrade)
-->
- [ ] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.
- [ ] For [docs
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#about-versioning),
review how to [version a whole
page](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
and [version a block of
content](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-blocks-of-content).
- [ ] Add a checklist item for anything that needs to happen before this
PR is merged, such as "needs technical review" or "change base branch."

Adding or removing pages (delete if not applicable):
- [ ] Add/remove page in `website/sidebars.js`
- [ ] Provide a unique filename for new pages
- [ ] Add an entry for deleted pages in `website/vercel.json`
- [ ] Run link testing locally with `npm run build` to update the links
that point to deleted pages
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Redshift unit test limitation dbt-labs/docs.getdbt.com
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