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From Yingyi Bu <buyin...@gmail.com>
Subject Re: ASTERIXDB-1371: Geo data type format question
Date Sun, 14 May 2017 17:54:07 GMT
Hi Wail,

    They're documented at:
https://ci.apache.org/projects/asterixdb/aql/builtins.html#SpatialFunctions
    The prefixes in the documentation are "create_".

Best,
Yingyi

On Sun, May 14, 2017 at 10:51 AM, Wail Alkowaileet <wael.y.k@gmail.com>
wrote:

> Previously, AsterixDB used to have such functions [1] prefixed with
> "create-*()". The functions are still in the master [2] .. but not
> documented.
> For the current spatial constructors, I think they're inspired by WKT. I
> cannot be helpful on explaining the reason why... sorry!
>
> [1]
> https://github.com/apache/asterixdb/blob/release-0.8.7/
> asterix-doc/src/site/markdown/aql/functions.md
> [2]
> https://github.com/apache/asterixdb/blob/master/
> asterixdb/asterix-om/src/main/java/org/apache/asterix/om/
> functions/BuiltinFunctions.java
>
> On Sun, May 14, 2017 at 8:00 PM, Preston Carman <prestonc@apache.org>
> wrote:
>
> > I have question about the format used by AsterixDB to store points,
> > lines, etc.[1]. As we are adding support for other formats [2], I
> > wanted to ask a question about our current format. In the current
> > format, we use a keyword to specify the type followed by parenthesis
> > around a specially formatted string. The uses spaces and commas to
> > separate numeric values for defining the given geo data type. Why use
> > a string with a special string format?
> >
> > Current Examples:
> > Point : point("80.10d, -10E5")
> > Line : line("10.1234,11.1e-1 +10.2E-2,-11.22")
> > Rectangle : rectangle("5.1,11.8 87.6,15.6548")
> > Circle : circle("10.1234,1.11 0.102")
> > Polygon : polygon("-1.2,+1.3e2 -2.14E+5,2.15 -3.5e+2,03.6 -4.6E-3,+4.81")
> >
> > Is there a reason you would not want to use numeric types instead of
> > specially defined string? Or even reused types to define new types
> > like using points to define a line. The following are some examples of
> > how we could reuse AsterixDB types to define points, lines, etc.:
> >
> > Type Based Example
> > Point : point(double, double)
> > Line : line(point(double,double), point(double,double))
> > Rectangle : rectangle(point(double,double), point(double,double))
> > Circle : circle(point(double,double),double)
> > Polygon : polygon(point(double,double), point(double,double),
> > point(double,double), point(double,double))
> >
> > It seems the other formats we are looking at reuse numeric type in
> > their type definitions. Thoughts?
> >
> > [1] http://asterixdb.apache.org/docs/0.9.1/datamodel.html#
> > PrimitiveTypesPoint
> > [2] https://issues.apache.org/jira/browse/ASTERIXDB-1371
> >
>
>
>
> --
>
> *Regards,*
> Wail Alkowaileet
>

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