postgresql - How to create dynamic sql query in pentaho report designer PRD 5.3? -


i using petaho report desiner

my main query 

select create_date  , sum(product_uos_qty) sale_order_line group create_date

it running properly

and sub query 

select column_name information_schema.columns table_schema='public'   , table_name='sale_order_line'   , (column_name = 'product_uos_qty' or column_name ='price_unit')

output of query 

product_uos_qty price_unit

i create parameter select

and convert main query this

select create_date  , sum(${select}) sale_order_line group create_date

but not running gives following error

error: query 'main' did not execute successfully. reason given was: 'org.pentaho.reporting.engine.classic.core.reportdatafactoryexception: failed @ query: select create_date , sum(${select}) sale_order_line group create_date'

tell me main problem , how can solve it


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