Sorry ! For some reason I missed a whole page. On Sun, May 14, 2017 at 8:54 PM, Yingyi Bu <[email protected]> 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 <[email protected]> > 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 <[email protected]> > > 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
