WL#1943: Internal GEOMETRY type
Affects: Server-7.0 — Status: Assigned — Priority: Medium
Now GEOMETRY objects are internally represented as binary strings containing WKB representation of the shape. It sometimes works ugly: - if one does SELECT geom_field FROM geom_table; he gets unreadable output in 'geom_field' column - the result of various dump methods is also unreadable - one just sees long lines of binary digits or even 'binary' strings as SELECT INTO result - very often WKB representation contains unnecessary data: - type of the object (if the field declared as POINT for example) - byte ordering (it's better to use just one ordering internally) - we are limited with OpenGIS set of geometry types. (users already asked for Box() type for example) I'd propose to do this: - to store data in the 'internal' format which is similar to WKB but with MySQL normal byte ordering and without unnecessary fields. - make AsWKB() function to build proper WKB - create Item_geom_func to be an ancestor to all Items returning GEOMETRY - add new val_geometry() method to the Item to return internal GEOMETRY object (only when HAVE_SPATIAL) - make val_str() functions of that items (actually of Item_geom_func) to return geometry object in the 'complete' form like 'SRID=12; POINT(1 2)' - make 'creating geometry values' functions (Point(..), Linestring(..) and other similar functions) to return internal GEOMETRY representation, not WKB. - add val_geom() method to Field_geom, and make it able to read 'complete' textual representation
Copyright (c) 2000, 2017, Oracle Corporation and/or its affiliates. All rights reserved.