Purpose

This page is not a list of things that will happen it is a place to gather disruptive changes that might make sense for a PostGIS 3 release.

Ideas

• Break out a postgis_raster extension with a postgis dependency, so raster support becomes optional.
• Require installation in a 'postgis' schema, always and for ever
• Yet another serialization, this time changing to use external storage type, and adding our own compression scheme for coordinates.
  • An uncompressed header, so header info can always be efficiently "sliced" and read, even for very large objects
  • A hash key for use in fast and small equality comparisons (for use in cached comparison code)
  • A compression format optimized for doubles
  • Other compression formats with other tradeoffs like TWKB for higher ratio with precision loss
  • Implies indirection in coordinate access again: smaller, more efficient must be balanced against direct access to coordinates
• Move up to "modern" C and use whatever cool features we like from that
• Modern GEOS version requirement?
  • Some major GEOS surgery to allow memory management by palloc?
  • Some major GEOS surgery to build CoordinateSequence directly on top of PostGIS pointlists?