[postgis-devel] script to unpackage raster functions from postgis extension

[Sandro Santilli]

While working on the experimental "postgis_raster" extension
split from "postgis", a big road block is being able to tell
apart raster objects from core objects when it comes to remove
them from extension being upgraded.

This is hard because:

  1) We need to drop any current or past object
     Hopefully known by analyzing:
      - rtpostgis_upgrade_cleanup.sql (past)
      - rtpostgis_drop.sql (past)
      - uninstall_rtpostgis.sql (current)
     Or using signatures in the bottom of postgis_restore.pl ?

  2) We can only drop if the function is there
     No "IF EXISTS" is available for ALTER EXTENSION DROP

For these reasons I'm thinking about adding another of our
perl creators for "extension opt-out", how does it sound ?

--strk; 

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