fix: in memory doc store get_unique_metadata_values() pagination and case-insensitive + Mixin tests updated

[davidsbatista]

Related Issues

• fixes:
  • https://github.com/deepset-ai/haystack-private/issues/475
  • https://github.com/deepset-ai/haystack-private/issues/474

Proposed Changes:

• adhere to the new get_unique_metadata_values() signature

How did you test it?

• updated Mixin tests - already being called by the InMemoryDocumentStore tests

Checklist

• I have read the contributors guidelines and the code of conduct.
• I have updated the related issue with new insights and changes.
• I have added unit tests and updated the docstrings.
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
• I have documented my code.
• I have added a release note file, following the contributors guidelines.
• I have run pre-commit hooks and fixed any issue.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
haystack-docs	Ignored	Preview	Jul 27, 2026 3:42pm

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
haystack/document_stores/in_memory
document_store.py					653
Project Total

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