.Net: docs: Add ADR-0065 for LINQ-based ITextSearch filtering migration strategy #13335
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Add comprehensive Architectural Decision Record documenting the dual interface pattern approach for migrating ITextSearch from clause-based filtering to LINQ expressions. Documents migration strategy, obsolete marking, and future removal path.
markwallace-microsoft
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- Add 'Text Search Contains() Support Implementation' subsection - Documents query enhancement pattern for Brave/Tavily - Explains SearchQueryFilterClause design decision - Lists alternatives and consequences - Add 'SearchQueryFilterClause Public Visibility' subsection - Documents public API decision and rationale - Explains FilterClause internal constructor constraint - Lists alternatives considered (move to Plugins.Web, InternalsVisibleTo, etc.) These implementation decisions are integral to the overall LINQ-based text search filtering architecture and belong within the main ADR. microsoft#10456
alzarei
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Nov 16, 2025
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| **Alternatives Considered**: | ||
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| 1. **Move to Plugins.Web**: Impossible due to internal constructor |
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Update per latest discussion, and changes:
…terClause decision in ADR-0065 Documents the architectural role of FilterClause as the common translation layer and updates the SearchQueryFilterClause visibility decision to reflect the implemented approach. Changes: - Added FilterClause architecture section with diagrams showing dual path convergence - Updated SearchQueryFilterClause decision: Made FilterClause constructor public and moved SearchQueryFilterClause to Plugins.Web (internal) - Clarified SearchQueryFilterClause is LINQ-only (never created by users) - Documented trade-off: Opening FilterClause to external inheritance to minimize MEVD API surface - Explained why FilterClause stays after legacy removal (LINQ translator needs it) - Distinguished user-facing APIs (removed in Phase 3) from internal translation layer (stays) - Added cross-reference between architecture explanation and decision rationale sections This captures the architectural discussion and final decision from PR microsoft#13191 review with @westey-m.
Changed FilterClause constructor from public to protected, which is the proper approach for abstract base classes. Changes: - Updated 'SearchQueryFilterClause Placement Decision' section (renamed from 'Public Visibility') - Simplified rationale: protected constructor allows inheritance while preventing instantiation - Removed mention of CA1012 suppression (no longer needed with protected) - Removed 'trade-off' language since protected is the standard practice - Updated cross-reference note to use new section name This reflects the final implementation using protected constructor as suggested in PR review.
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Add ADR-0065: LINQ-Based Filtering for ITextSearch Interface
Summary
This PR adds a comprehensive Architectural Decision Record (ADR) documenting the decision to migrate
ITextSearchfrom clause-based filtering to LINQ-based filtering using a dual interface pattern.Context
Issue: #10456
The existing
ITextSearchinterface usesTextSearchFilter(clause-based approach) which:VectorSearchFilterAPIs internallyDecision
Chosen Approach: Dual Interface Pattern (Option 3)
ITextSearch<TRecord>with LINQ filtering (Expression<Func<TRecord, bool>>)ITextSearchmarked[Obsolete]for backward compatibilityKey Architectural Points
Migration Strategy (Temporary by Design)
Why Mark as
[Obsolete]NowImplementation Patterns Documented
Pattern A: Direct LINQ Passthrough (VectorStoreTextSearch)
Pattern B: LINQ-to-Legacy Conversion (Bing, Google, Tavily, Brave)
Benefits
✅ Zero breaking changes - existing code continues working
✅ Type safety - compile-time validation and IntelliSense
✅ AOT compatible - no
[RequiresDynamicCode]attributes✅ Clear migration path - deprecation warnings guide users
✅ Future-ready - establishes path for technical debt removal
Related PRs
This ADR documents the architectural decision behind:
Review Notes
Per ADR process requirements:
accepted(implementation already complete)This ADR serves as:
Checklist
accepted0065-linq-based-text-search-filtering.mddotnet/docs/decisions/Target Branch
feature-text-search-linq