ClickHouse: support the strictness before the join type (ASOF LEFT JOIN, ANY LEFT JOIN, ...)

[MunMunMiao]

Problem

The ClickHouse dialect only knows the join strictness after the join type (LEFT ASOF JOIN, LEFT ANY JOIN). ClickHouse also accepts it before the join type, and its documentation uses that form:

• ASOF LEFT JOIN in the syntax of the ASOF JOIN section
• ANY LEFT JOIN in an example query on the same page
• ALL INNER JOIN in the text about the block nested loop join

Such a join is not recognised as one unit, so the strictness keyword is left at the end of the previous line:

SELECT a FROM t1 ASOF LEFT JOIN t2 ON t1.k = t2.k AND t1.t >= t2.t ANY LEFT JOIN t3 USING (k)

Before (15.9.0, language: 'clickhouse'):

SELECT
  a
FROM
  t1 ASOF
  LEFT JOIN t2 ON t1.k = t2.k
  AND t1.t >= t2.t ANY
  LEFT JOIN t3 USING (k)

After:

SELECT
  a
FROM
  t1
  ASOF LEFT JOIN t2 ON t1.k = t2.k
  AND t1.t >= t2.t
  ANY LEFT JOIN t3 USING (k)

Change

Adds [GLOBAL] {ANY|ALL|ASOF} [INNER|LEFT|RIGHT|FULL] [OUTER] JOIN next to the existing join phrase. The existing forms are unchanged. I only included the strictness words that the documentation shows before the join type (ANY, ALL, ASOF).

Tests

Added the new forms to the supportsJoin list in test/clickhouse.test.ts (ANY LEFT JOIN, ALL INNER JOIN, ASOF LEFT JOIN, ASOF LEFT OUTER JOIN, GLOBAL ANY LEFT JOIN, ...). pnpm exec jest passes for all dialects (5901 passed, 1 skipped), and tsc --noEmit, prettier --check and eslint are clean.

Fixes #989.

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This change was prepared with Claude Code (an AI coding assistant) and checked by running the full test suite locally.

[Copilot]

🟢 Approval recommended

The phrase expansion correctly covers the intended syntax and is supported by focused formatting tests.

0 open findings

What changed in this PR

Adds ClickHouse formatting support for join strictness keywords placed before the join type.

Changes:

• Recognizes ANY, ALL, and ASOF before join types, optionally with GLOBAL and OUTER.
• Adds formatting tests for representative strictness-first joins.

File	Description
src/​languages/​clickhouse/​clickhouse.formatter.ts	Adds strictness-first join phrases.
test/​clickhouse.test.ts	Tests supported strictness-first forms.

🧠 Review effort: Balanced

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[MunMunMiao]

Closing for now: I'm going to handle the formatting on my side instead. Thanks for the library.