case performance

Sjoerd Mullender sjoerd at monetdb.org
Mon Oct 7 15:43:53 CEST 2019


On 07/10/2019 14.33, Roberto Cornacchia wrote:
> Hi Daniel,

[...]

> In this case, you would get better performance by implementing a BAT
> function (not a function that works on a single value, but on a column
> of values). 
> You would write that in C using the GDK api
> (https://www.monetdb.org/Documentation/Cookbooks/SQLrecipes/UserDefinedFunction),
> and evaluate the condition i the loop, per value.
> However, this requires you to recompile MonetDB to include your new
> function.

Recompilation of MonetDB should not be necessary.  See [1].

[1] https://www.monetdb.org/hg/MonetDB-extend/

-- 
Sjoerd Mullender

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