How to use large SQL-query for %{sql:} clause?

[George Koulyabin]

Hello.

I am using FR v2.1.6.

I am needing to generate values of reply attributes via SQL. I am using `%{sql:SQL-query}` clause.
I am inserting attribute/value pairs into radreply table, where value - `%{sql:}`-clause. 
But I had got complex and large queries. I don't want to increase size of fields of SQL-table.
How I can solve this problem?