Support for multi-column aggregate functions
Anderson, David B
david.b.anderson at citi.com
Wed Apr 27 17:07:47 CEST 2016
I was hoping to use a native/low level implementation for high performance (my data set is on the order of 2. It looks like multiple column aggregates are supported (corr & covar) so in theory I could add a new function.
Poking around in the archives, it looks like I need to add a new MAL and link it to a C implementation.
Are there any examples on how to do this?
From: users-list [mailto:users-list-bounces+david.b.anderson=citi.com at monetdb.org] On Behalf Of Anthony Damico
Sent: Wednesday, April 27, 2016 9:47 AM
To: Communication channel for MonetDB users
Subject: Re: Support for multi-column aggregate functions
possible to translate one of these?
On Wednesday, April 27, 2016, Anderson, David B <david.b.anderson at citi.com<mailto:david.b.anderson at citi.com>> wrote:
I am really looking for an implementation of a weighted percentile within a group.
From: Anderson, David B [ICG-MKTS]
Sent: Wednesday, April 27, 2016 9:18 AM
Subject: Support for multi-column aggregate functions
Does the current version of MonetDB support multi-column aggregate functions? I need to create a function which returns the "quantiles" of one column using another column as a weighting. It looks like PostgreSQL supports multi-column aggregates as of 8.2.
I could write an embedded R function to compute this, but want to know if it is even possible to pass in multiple columns.
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