How to call SP automatically when issue a select clause?

I have a dw to get data from sql select like:
select * from tab, proxytab where tab.id = proxytab.id ...
the proxy table is created based on a stored procedure result set.
When dw retrieve data, it will call sp automatically by proxy table. but there is a big performance problem. So I decided to replace proxy table with a physical table with same name to save the result set from sp.
As I don't want to change any code in powerbuilder. Question is: how to call sp to put the result data in the physical table when dw retrieve data?

What is the backend DBMS here?
You're using the phrase "proxy table", but it doesn't sound like that's what you might mean. A Proxy Table is like a "remote query" against a table in a different database. It allows you to do table joins when the two tables are stored in physically separate databases.
What you're describing sounds more like a "global temporary table", where some process (your stored procedure, for example) runs a bunch of complex queries, then inserts its result set into this temp table. The temp table looks and feels exactly like a real table, but the data is only available to the current connection, and the table and all its data is deleted when the connection is dropped.
Is that it? Because you can define the table as a GLOBAL TEMPORARY, and it's definition is available in the system catalog. You can write queries against them without having to define the table as a physical table...
Now - to your original question - how to call the stored procedure to populate the temp table before you execute the query against it? I'd use the RetrieveStart event of the datawindow that queries the temp table.
::retrieveStart
if (select count(*) from temp_table) > 0 then RETURN
EXECUTE stored_procedure arg1, arg2, arg3 using SQLCA;

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