Hello

> - add a parent_statement_id column that would be NULL for top level queries

Will generate too much entries... Every FK for each different delete/insert, 
for example.
But very useful for databases with a lot of stored procedures to find where 
this query is called. May be new mode track = tree? Use NULL to indicate a 
top-level query (same as with track=tree) and some constant for any nested 
queries when track = all.

Also, currently a top statement will account buffers usage for underlying 
statements?

regards, Sergei


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