fix: remove extra space after BETWEEN _ AND _ expression

[sarathfrancis90]

I noticed the formatter emits two spaces after a BETWEEN predicate whenever something follows it on the same line. With default options:

format('SELECT CASE WHEN foo BETWEEN 1 AND 2 THEN 3 END');

gives WHEN foo BETWEEN 1 AND 2 THEN 3. Same for logicalOperatorNewline: 'after' (b BETWEEN 1 AND 2 AND) and for b BETWEEN 1 AND 2 IS TRUE.

The cause is in formatBetweenPredicate: the sub-expression for the upper bound already ends with a trailing space, and the method then adds another WS.SPACE on top. It usually goes unnoticed because with the default logicalOperatorNewline: 'before' the following WS.NEWLINE trims the doubled space away. The lower bound already normalizes this with WS.NO_SPACE, WS.SPACE, so I did the same for the upper bound.

Two existing expectations had the extra space baked in (test/features/between.ts and test/features/case.ts); both are updated to the intended single space.

Tested with pnpm run check (typecheck, prettier, eslint, full jest suite) — all green. I also re-ran a format/re-format idempotency sweep over the repo's own test queries across every dialect and the option matrix; nothing changed apart from the removed space.

[coderabbitai]

📝 Walkthrough

Walkthrough

The formatter changes whitespace token emission after BETWEEN. Existing expectations are updated for arithmetic and CASE expressions, and a regression test verifies formatting inside a CASE WHEN clause.

Changes

BETWEEN whitespace correction

Layer / File(s)	Summary
Update BETWEEN spacing and regression coverage src/formatter/ExpressionFormatter.ts, test/features/between.ts, test/features/case.ts	formatBetweenPredicate now emits WS.NO_SPACE followed by WS.SPACE; tests validate corrected spacing for arithmetic and CASE expressions.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: nene

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly summarizes the main fix: removing an extra space in BETWEEN predicate formatting.
Description check	✅ Passed	The description directly explains the formatting bug, the code change, and the updated tests for the same issue.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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