Generate SQL from Statement

[hu6360567]

Is there any plan to support deparse AST back to sql, so that I can distribute sub queries to DBMS distributely?

As apache/datafusion#970 describes, I'm trying to analyse and optimize SQL query which involves mutli datasets located in DBMS distributely.
Sub queries should be sent to corresponding executors to execute and aggreate at another certain executor. I'd like to collect the LogicalPlan into a single sql query to execute directly in DBMS.

[hu6360567]

directly call to_string method of statement object should work as expect.