fix: bracket match query display

[jackye1995]

Wrap MatchQuery display output in brackets so external metric suffixes render as [name]: metrics instead of making the separator look like part of the query text.

Local builds were not run per request.

Summary by CodeRabbit

• Style
  • Updated Full Text Search (FTS) query plan output to wrap the MatchQuery label in square brackets for the default/verbose display.
• Tests
  • Adjusted FTS execution-plan expectation strings and snapshots to match the updated MatchQuery formatting.

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ℹ️ Recent review info

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Run ID: e065344a-d060-49e5-9c2a-0f2461b010ed

📥 Commits

Reviewing files that changed from the base of the PR and between 2c5f0f9 and 39ac6d5.

📒 Files selected for processing (4)

• rust/lance/src/dataset/mem_wal/memtable/flush.rs
• rust/lance/src/dataset/scanner.rs
• rust/lance/src/dataset/tests/dataset_aggregate.rs
• rust/lance/src/io/exec/fts.rs

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📝 Walkthrough

Walkthrough

The MatchQueryExec display formatter now wraps its MatchQuery output in square brackets, and FTS execution-plan test expectations are updated accordingly.

Changes

MatchQuery display formatting

Layer / File(s)	Summary
Update MatchQuery plan formatting rust/lance/src/io/exec/fts.rs	The default and verbose display formats change from MatchQuery: ... to [MatchQuery: ...].
Align FTS plan expectations rust/lance/src/dataset/mem_wal/memtable/flush.rs, rust/lance/src/dataset/scanner.rs, rust/lance/src/dataset/tests/dataset_aggregate.rs	FTS plan and aggregate test expectations now use the bracketed MatchQuery representation across query, boost, prefilter, unindexed-row, and fast-search cases.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: wjones127, xuanwo

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and accurately summarizes the MatchQuery display-format change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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