Hi all,
I'm new to the H2 community and I want to get acquainted with tailoring it
by attempting to try and add two new aggregate functions. From what I
understand, I need to write the java file to implement the interface at
org.h2.api.AggregateFunction. I was looking through the list of currently
built aggregate functions on the H2 website here
<http://www.h2database.com/html/functions.html> and thought I would try and
implement aggregate functions for '*Median*' and '*Mode*'. However, when
looking through the H2 src (Which I got from their GitHub as of Nov.14th,
2018), I found a file '*Aggregate*' in org.h2.expression.aggregate. That
file in turn extends '*AbstractAggregate*' also found in the same
directory. Neither uses the '*AggregateFunction*' interface. My concerns
are as follows:
1. The new '*Aggregate*' file already has declarations for '*Median*'
and '*Mode*', so is there a way I can still implement my own?
2. I've read through some of the other google posts, but I'm still
unsure as to how I define the SQL commands in the java class file such that
I can call my own aggregate functions
3. Assuming that I still do need to use the original interface, would I
place my .java files in the same directory?
1. If I should *not* use the original interface, can someone please
point me in the direction of the files I *should* be referencing?
Thank you all for your help!
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