Show or log long queries with values instead placeholders

Question

I have any very long sql query in postgresql. I tried show what postgress do with:

select * from pg_stat_activity 

unfortunately I see something like:

select some_fields from anytable1 anytable2 where \ ( anyfield1.anytable1=$1 )and( anyfield2.anytable2=$2 ); 

Is it possible to show what values are replacing parameters $1 $2 ? It is not important, it can be log file or any sql command. I must debug it because something is terminating. this is long query and I want to test it manually.