How does Partition Expression work in OpenMetadata?

[abuberkut]

Hello
Our team has started writing tests in OpenMetadata but doesn’t fully understand what Partition Expression is and where it should be used.

@TeddyCr

Questions:

1. How does OM use Partition Expression?

• Is it a filter for the SQL test or only for calculating Passed/Failed Row Count?
• How does it interact with Compute Row Count when enabled?

2. Where and how can it be used?

• Can it be used for time slices, categories, groups, or window functions?
• Are there syntax restrictions depending on the database dialect?

3. Which metrics does Partition Expression affect?

• How does OM calculate Passed/Failed Rows and percentages?

Goal: to understand the real functionality of Partition Expression, when it should be used, and what its limitations are.