Unparsing of filter on subquery generates invalid SQL

[nuno-faria]

Describe the bug

When unparsing a plan with a SubqueryAlias + FilterExec, the resulting SQL can be invalid, since the alias will be applied to the base table while the filter still refers to the previous table name.

To Reproduce

This query

select *
from (
    select a
    from t
) t2
where a = 1

is optimized to a plan like this

SubqueryAlias: t2
  Filter: t.a = Int32(1)
    TableScan: t projection=[a]

which is unparsed to

SELECT * FROM t AS t2 WHERE (t.a = 1) -- t.a is invalid

Expected behavior

No response

Additional context

No response