In clause from source table not working

Hi Guys,

I have a case, where I used to extract data from table A with following filter(in Query where tab).

A.column IN ('A','B','C','D'....(n))

I'm passing these values as a global variable. These values tend to change during runtime.

$Codes=\'A\',\'B\',\'C\',\'D\'....(n).

Above scenario doesn't work. So,I thought to use pushdown_sql like below.

pushdown_sql('DATASTORE_NAME','A.column  in ({$Codes})').

I'm getting below error.

passed to the function. This function cannot be pushed down. Reorganize the data flow components so that it can be pushed down.

I don't want to use to put those codes in separate table. Kindly help me to get through this.

Thanks