Recipe to reproduce `UnsupportedFeatureException[Function FunctionName{schema='null', name='count'}(text) is not a scalar function.]`

cratedb_functionname_nested.py

import sqlalchemy as sa


def workload():
    """
    Install
    uv pip install sqlalchemy-cratedb psycopg2-binary

    Invoke
    python cratedb_functionname_nested.py

    Problem
    UnsupportedFeatureException[Function FunctionName{schema='null', name='count'}(text) is not a scalar function.]
    [SQL:
    SELECT *
    FROM parent
    JOIN
      (SELECT child.name AS name
       FROM child
       GROUP BY child.name
       HAVING count(?) = ?) AS anon_1 ON parent.name = anon_1.name
            ]
    [parameters: ('parent.name', '42')]
    """

    # Works with PostgreSQL.
    # docker run --rm --publish=5433:5432 --env "POSTGRES_HOST_AUTH_METHOD=trust" postgres:18 postgres -c log_statement=all
    # engine = sa.create_engine("postgresql://postgres@localhost:5433")

    # Fails with CrateDB.
    # docker run --rm --publish=4200:4200 --publish=5432:5432 crate/crate:nightly -Cdiscovery.type=single-node
    engine = sa.create_engine("crate://")

    with engine.connect() as conn:
        conn.execute(
            sa.text("""
CREATE TABLE IF NOT EXISTS "parent" (
   "name" TEXT NOT NULL,
   "description" TEXT,
   PRIMARY KEY ("name")
);
        """)
        )
        conn.execute(
            sa.text("""
CREATE TABLE IF NOT EXISTS "child" (
   "name" TEXT NOT NULL,
   PRIMARY KEY ("name")
);
        """)
        )
        conn.execute(
            sa.text("""
SELECT *
FROM parent
JOIN
  (SELECT child.name AS name
   FROM child
   GROUP BY child.name
   HAVING count(:name) = :value) AS anon_1 ON parent.name = anon_1.name
        """),
            {"name": "parent.name", "value": "42"},
        )


if __name__ == "__main__":
    workload()