ingres_type: ingres_geometry
Although not a valid geometry type on an individual feature, this type may be set for the destination geometry column type to indicate that any geometry is allowable in that column. If the writer directive GENERIC_GEOMETRY is specified at generation time, all destination feature types will have geometry columns of this type. Alternatively, although it will not happen by default, this type can be specified on any one or more destination feature types manually to create generic geometry columns on those specific tables.
Note that although the geometry column is explicitly determined by the user when writing, the reader will attempt to determine the geometry column name and type using the Ingres Spatial metadata tables.