[abu-tahir-0]

Problem

Fixes #2329.

When using SQL functions containing qualified column names in select() (e.g. COUNT(item.id) AS count or AVG(order.total)), FieldStatement::compile() generates invalid SQL such as COUNT(item.id)AScount``. This syntax error causes query execution to fail on MySQL and PostgreSQL.

Root Cause

In FieldStatement::compile(), $field is split on . before checking for function calls:

$field = arr(explode('.', $field))
    ->map(...)
    ->map(function (string $part) use ($dialect) {
        if (str_contains($part, '(')) {
            return $part;
        }
        ...
        return $dialect->quoteIdentifier($part);
    })

When $field is COUNT(item.id), exploding on . produces ['COUNT(item', 'id)']. Because only the first part contains (, the second part id) is incorrectly quoted by quoteIdentifier(), resulting in COUNT(item.id)`.

Solution

Check if (! str_contains($field, '(')) before exploding on .. When a field expression contains parentheses (indicating an aggregate function or expression), skip identifier quoting on the expression itself while preserving alias quoting (e.g. AS \count`orAS "count"`).

Testing

• Added regression tests in FieldStatementTest covering COUNT(item.id) AS count across SQLite, MySQL, and PostgreSQL dialects.
• Verified all 212 tests in packages/database/tests pass.
• PHPStan analysis clean.

Impact

Allows queries with aggregate functions or function calls referencing joined table columns to compile valid SQL without identifier quoting syntax errors.