[PostGIS] #5317: ST_Union(rast, uniontype) treat bands with different classes as the same as first band

[PostGIS]

#5317: ST_Union(rast, uniontype) treat bands with different classes as the same as
first band
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  Reporter:  shenzhuxi  |      Owner:  robe
      Type:  defect     |     Status:  new
  Priority:  medium     |  Milestone:  PostGIS 3.5.0
 Component:  raster     |    Version:  3.0.x
Resolution:             |   Keywords:
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Changes (by robe):

 * version:  3.3.x => 3.0.x
 * milestone:  PostGIS 3.1.10 => PostGIS 3.5.0

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5317#comment:4>
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