#1182 Use Hex/WKT for Geometry Export columns

[Greg Roach]

The database/table export facility has an option to export binary data as ascii text: "Use hexadecimal for BLOB
Export type".

A similar feature is needed for geometry columns.

MySQL can convert them to WKT/WKB format using AsText() and AsBinary().
MySQL can convert the data back using GeomFromText() and GeomFromWKB().

[Madhura Jayaratne]

De-assigning myself since I didn't find a straightforward way of implementing this.

[Madhura Jayaratne]

Data exporting uses unbuffered mode which makes it impossible to send additional queries to convert data to WKT/WKB. On the other hand modifying the original query to convert data to WKT/WKB can not be done reliably for all cases. Moreover, such query modification complicates the logic and I do not believe it is worth the benefits.

[Madhura Jayaratne]

Won't fix due to technical difficulties.