fix: mark window functions as aggregate expressions for CTE compatibi…

[jeffreyaven]

…lity

Window functions (those with OVER clause) are computed expressions that should not be looked up in underlying tables or CTEs. By setting IsAggregateExpr = true for window functions, we allow them to bypass column resolution in indirect queries (CTEs, subqueries, views).

This fixes "cannot find col" errors when using window functions like RANK(), ROW_NUMBER(), SUM() OVER, etc. in queries that reference CTEs.

Description

Type of change

• Bug fix (non-breaking change to fix a bug).
• Feature (non-breaking change to add functionality).
• Breaking change.
• Other (eg: documentation change). Please explain.

Issues referenced.

Evidence

Checklist:

• A full round of testing has been completed, and there are no test failures as a result of these changes.
• The changes are covered with functional and/or integration robot testing.
• The changes work on all supported platforms.
• Unit tests pass locally, as per the developer guide.
• Robot tests pass locally, as per the developer guide.
• Linter passes locally, as per the developer guide.

Variations

Tech Debt