What happened?

Hi there 👋

PRQL generates an invalid clause for Snowflake dialect.
According to Snowflake's documentation, the ROW_NUMBER always needs the ORDER BY, which is missing in current generated SQL.

Currently the following error occurs:
Window function type [ROW_NUMBER] requires ORDER BY in window specification.

PRQL input

from invoices
group { this.`customer_id` } (take 1)

SQL output

WITH table_0 AS (
  SELECT
    *,
    ROW_NUMBER() OVER (PARTITION BY customer_id) AS _expr_0
  FROM
    invoices
)
SELECT
  *
FROM
  table_0
WHERE
  _expr_0 <= 1

Expected SQL output

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Anything else?

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