tests: FalkorDBDocumentStore removing duplicated tests already covered by haystack Mixin tests + overriding one

[davidsbatista]

Related Issues

• fixes https://github.com/deepset-ai/haystack-private/issues/501

Proposed changes

• test_get_metadata_field_unique_values_distinct_types expects int, float, str and bool values sharing the same metadata field name to all come back as distinct. FalkorDB fails this because of a Cypher limitation:

  WITH DISTINCT d.priority AS val   -- 1 and 1.0 collapse into one value

  Verified live: a per-node property read correctly preserves each value's own
  type, but Cypher's DISTINCT treats the int 1 and the float 1.0 as equal,
  collapsing them into a single value (3 distinct values instead of 4). Not
  fixable in code.

  Fix: adapted the test to use one metadata field per type instead of one
  shared field (matching the same pattern applied to other document stores
  hitting this limitation), and used a fractional float (1.5) to sidestep the
  int/float ambiguity. Documented the limitation in the docstring and an inline
  comment.

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I 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:.

[github-actions]

Coverage report (falkordb)

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
integrations/falkordb/src/haystack_integrations/document_stores/falkordb
document_store.py
Project Total

This report was generated by python-coverage-comment-action

[sjrl]

Looks good!