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### Is there an existing issue for this? - [x] I have searched the existing issues --- Please see: https://github.com/milvus-io/milvus/issues/44593 for the background This PR makes https://github.com/milvus-io/milvus/pull/44638 redundant, which can be closed. The PR comments for the original implementation suggested an alternative and a better approach, this new PR has that implementation. --- This PR - Adds an optional `minimum_should_match` argument to `text_match(...)` and wires it through the parser, planner/visitor, index bindings, and client-level tests/examples so full-text queries can require a minimum number of tokens to match. Motivation - Provide a way to require an expression to match a minimum number of tokens in lexical search. What changed - Parser / grammar - Added grammar rule and token: `MINIMUM_SHOULD_MATCH` and `textMatchOption` in `internal/parser/planparserv2/Plan.g4`. - Regenerated parser outputs: `internal/parser/planparserv2/generated/*` (parser, lexer, visitor, etc.) to support the new rule. - Planner / visitor - `parser_visitor.go`: parse and validate the `minimum_should_match` integer; propagate as an extra value on the `TextMatch` expression so downstream components receive it. - Added `VisitTextMatchOption` visitor method handling. - Client (Golang) - Added a unit test to verify `text_match(..., minimum_should_match=...)` appears in the generated DSL and is accepted by client code: `client/milvusclient/read_test.go` (new test coverage). - Added an integration-style test for the feature to the go-client testcase suite: `tests/go_client/testcases/full_text_search_test.go` (exercise min=1, min=3, large min). - Added an example demonstrating `text_match` usage: `client/milvusclient/read_example_test.go` (example name conforms to godoc mapping). - Engine / index - Updated C++ index interface: `TextMatchIndex::MatchQuery` - Added/updated unit tests for the index behavior: `internal/core/src/index/TextMatchIndexTest.cpp`. - Tantivy binding - Added `match_query_with_minimum` implementation and unit tests to `internal/core/thirdparty/tantivy/tantivy-binding/src/index_reader_text.rs` that construct boolean queries with minimum required clauses. Behavioral / compatibility notes - This adds an optional argument to `text_match` only; default behavior (no `minimum_should_match`) is unchanged. - Internal API change: `TextMatchIndex::MatchQuery` signature changed (internal component). Callers in the repo were updated accordingly. - Parser changes required regenerating ANTLR outputs Tests and verification - New/updated tests: - Go client unit test: `client/milvusclient/read_test.go` (mocked Search request asserts DSL contains `minimum_should_match=2`). - Go e2e-style test: `tests/go_client/testcases/full_text_search_test.go` (exercises min=1, 3 and a large min). - C++ unit tests for index behavior: `internal/core/src/index/TextMatchIndexTest.cpp`. - Rust binding unit tests for `match_query_with_minimum`. - Local verification commands to run: - Go client tests: `cd client && go test ./milvusclient -run ^$` (client package) - Go testcases: `cd tests/go_client && go test ./testcases -run TestTextMatchMinimumShouldMatch` (requires a running Milvus instance) - C++ unit tests / build: run core build/test per repo instructions (the change touches core index code). - Rust binding tests: `cd internal/core/thirdparty/tantivy/tantivy-binding && cargo test` (if developing locally). --------- Signed-off-by: Amit Kumar <amit.kumar@reddit.com> Co-authored-by: Amit Kumar <amit.kumar@reddit.com>