Not really an answer to your question but a solution:

You could create a database table such as: 

create table elements (
    position      int8,
    start_value   int8,
    end_value     int8
);

[download]

Then, after filling the table, this query would give you the desired result: 

select position from element where end_value >= 50000 and start_value 
+<= 1000000;

[download]

This effectively gives the tree hassle to the database.

UPDATE: Changed the SQL query to reflect the original query in the question (and a typo)

--tidiness is the memory loss of environmental mnemonics

In reply to Re: indexing segments by EvdB
in thread indexing segments by glwtta

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