Function validate_grouped_expressions 

pub fn validate_grouped_expressions(
    routines: &dyn RoutineResolution,
    statement: &QueryBlockPlan,
    schema: &RowSchema,
    outer: Option<&RowSchema>,
    params: &[SQLParam],
) -> Result<(), SQLError>

Validate the grouped expressions of a query whose own columns schema holds over outer, the scope of the queries that enclose it.