MySQL Reference Manual for version 4.0.18.
17.7.1 GIS Features That Are Not Yet Implemented
- Additional Metadata Views
- OpenGIS specifications propose several additional metadata views.
For example, a system view named
GEOMETRY_COLUMNS contains a
description of geometry columns, one row for each geometry column
in the database.
- The OpenGIS function
Length() on LineString and MultiLineString currently should be called in MySQL as GLength()
- The problem is that there is an existing SQL function
Length() which calculates the length of string values,
and sometimes it's not possible to distinguish whether the function is
called in a textual or spatial context. We need either to solve this
somehow, or decide on another function name.
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