fix(filters): sort comparator for LowCardinality fields never returns 0

[tsushanth]

Summary

• In DBSearchPageFilters/hooks.ts, the .sort() comparator that orders fields by LowCardinality-first returned 1 for every pair that wasn't (a=LC, b=!LC) — including when both fields share the same cardinality.
• A comparator that returns a non-zero value for equal elements violates the antisymmetry contract and produces non-deterministic ordering within each group (LC and non-LC fields get shuffled/reversed relative to their original positions).
• Fixed by computing the sort key as (isLC(b) ? 1 : 0) - (isLC(a) ? 1 : 0), which correctly returns -1, 0, or 1 for all three cases.

Before:

return isLowCardinality(a.type) && !isLowCardinality(b.type) ? -1 : 1;
// returns 1 when both LC, both non-LC, or b=LC/a=!LC — never 0

After:

return (isLowCardinality(b.type) ? 1 : 0) - (isLowCardinality(a.type) ? 1 : 0);
// returns -1 (a=LC, b=!LC), 1 (a=!LC, b=LC), 0 (both same)

Test plan

• Open the filter sidebar on a search page with a source that has both LowCardinality and non-LowCardinality string columns
• Confirm LowCardinality fields appear before non-LowCardinality fields
• Confirm fields within each group maintain a stable relative order across re-renders

[vercel]

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[greptile-apps]

Greptile Summary

This PR fixes the field ordering comparator in the search filter sidebar.

• Updates the LowCardinality-first sort in DBSearchPageFilters/hooks.ts.
• Returns equal comparison results for fields in the same cardinality group.
• Preserves stable relative ordering within LowCardinality and non-LowCardinality groups.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
packages/app/src/components/DBSearchPageFilters/hooks.ts	Fixes the LowCardinality-first comparator so equal groups keep their relative order.

_{Reviews (3): Last reviewed commit: "style(app): format sort comparator to sa..." | Re-trigger Greptile}