Mark, some progress. Throughout I've used a 'real' database for testing
this, but I now decided to create a test database just like yours and with
that I get the following results:
3.744000 OO_ARRAY_OF_ARRAYS
11.201000 OO_ARRAY_OF_DIRECTORIES
19.126000 OO_STEM_OF_STEMS
So why this difference? The major difference between the databases that I
can think of is that the 'real' database contains a LARGE number of NULL
values, while the test database doesn't have any. I will try to create a
different test database that includes NULLs and see what happens.
Staffan
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