Wrong aliasing when "supportsSelectExpression" is false in translator capabilities

When "supportsSelectExpression" is false, in the translator capabilities and user submits a query like

select sum (intnum) as "sum" from smalla group by intkey order by "sum"

the pushdown command at the translator is

SELECT SUM(SMALLA.INTNUM) FROM SMALLA GROUP BY SMALLA.INTKEY ORDER BY c_0

The alias in the ORDER BY is wrong. Also do not understand why the query engine pushed the aggregate is being pushed, possibly due to "supportsAggregatesSum" is turned on.