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From: Wail Alkowaileet <wael.y.k@gmail.com>
Date: Sun, 14 May 2017 21:21:00 +0300
Message-ID: <CALgBV_dit8QT3rpMQ97Z3N0vHUd5ywMbWz0r4BB5QrKq_Ca1Sg@mail.gmail.com>
Subject: Re: ASTERIXDB-1371: Geo data type format question
To: dev@asterixdb.apache.org
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archived-at: Sun, 14 May 2017 18:21:06 -0000

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Just for reference, two years ago we had a discussion about serialization
for clean JSON:

http://www.mail-archive.com/dev@asterixdb.incubator.apache.org/msg00882.html

On Sun, May 14, 2017 at 9:08 PM, Preston Carman <prestonc@apache.org> wrote:

> Thanks for pointing out we have functions that provide a way to create
> the data using numeric values. As a review, we have functions to
> create points using numeric types and the serialized form (ADM) holds
> the special string format.
>
> function: create_point(47.44,80.65)
> adm: point("47.44,80.65")
>
> On Sun, May 14, 2017 at 10:58 AM, Wail Alkowaileet <wael.y.k@gmail.com>
> wrote:
> > Sorry ! For some reason I missed a whole page.
> >
> > On Sun, May 14, 2017 at 8:54 PM, Yingyi Bu <buyingyi@gmail.com> wrote:
> >
> >> 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
> >> >
> >>
> >
> >
> >
> > --
> >
> > *Regards,*
> > Wail Alkowaileet
>


-- 

*Regards,*
Wail Alkowaileet

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