[PostGIS] #2807: [raster] ST_MapAlgebra injecting a default NODATA value of 0

[PostGIS]

#2807: [raster] ST_MapAlgebra injecting a default NODATA value of 0
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  Reporter:  strk    |      Owner:  dustymugs
      Type:  defect  |     Status:  closed
  Priority:  medium  |  Milestone:  PostGIS Fund Me
 Component:  raster  |    Version:  master
Resolution:  fixed   |   Keywords:
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Changes (by Darafei Praliaskouski <me@…>):

 * resolution:   => fixed
 * status:  new => closed

Comment:

 In [changeset:"ea6edb5d5a44804bd0e3d2d05d76b220134fae1f/git" ea6edb5/git]:
 {{{#!CommitTicketReference repository="git"
 revision="ea6edb5d5a44804bd0e3d2d05d76b220134fae1f"
 raster: preserve missing NODATA in map algebra

 ST_MapAlgebra no longer injects an output NODATA value when the selected
 input band has none. Expression and callback variants now raise an error
 if they produce NULL without an output NODATA value available.

 Keep ST_Grayscale explicit about its own NODATA contract so later RGB-band
 NODATA values still become output NODATA pixels even when the first band
 has no NODATA value.

 Closes #2807

 Closes https://github.com/postgis/postgis/pull/1056
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/2807#comment:8>
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