[moshap-firebolt]

Spark has a higher-order function exists(expr, pred), as Databricks does, but only DatabricksDialect parsed it:

SELECT exists(array(1, 2), x -> x > 1)
-- Spark: Expected: SELECT, VALUES, or a subquery in the query body, found: array

The Databricks-only dialect_of! check becomes a dialect method, Dialect::supports_exists_function, enabled for both.

That check read EXISTS ( as the predicate only when SELECT or WITH came next, so under Databricks EXISTS (VALUES (1)) parsed as a call to a function named EXISTS, and EXISTS (TABLE t), EXISTS (FROM t SELECT a) and EXISTS ((SELECT 1) UNION (SELECT 2)) failed. Dialects with the method now try the predicate first and fall back to the function call, after NOT as well, so NOT exists(arr, x -> x > 1) parses too.

Tests in sqlparser_common.rs cover the function, NOT and each query form on the dialects with the method, and the unchanged error on the rest; sqlparser_spark.rs covers Spark, which all_dialects() leaves out. They fail without the change.

This PR was prepared with AI assistance (Claude).

Dialects: Spark, Databricks

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.61%. Comparing base (b22bf61) to head (3abb45f).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/parser/mod.rs	84.61%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2772      +/-   ##
==========================================
+ Coverage   82.52%   82.61%   +0.08%     
==========================================
  Files          42       42              
  Lines       35533    35615      +82     
  Branches    35533    35615      +82     
==========================================
+ Hits        29323    29422      +99     
+ Misses       2675     2659      -16     
+ Partials     3535     3534       -1     

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[sabir-akhadov-localstack]

A parenthesised query is also a query: SELECT EXISTS ((SELECT 1) UNION (SELECT 2)) parses as Expr::Exists on Spark today and fails on this branch (Expected: ), found: UNION); EXISTS ((SELECT 1)) becomes a function call. Adding Token::LParen to the peek (or trying parse_exists_expr first and falling back to the function call) would keep that. Related: NOT exists(arr, x -> x > 1) still fails because parse_not routes NOT EXISTS straight to parse_exists_expr without consulting the new hook.

[moshap-firebolt]

Good catch - both done!