[estebanzimanyi]

AggregatesCatalogTest registers rasterUnion, sameAlignmentAgg and summaryStatsAgg among the
names of the catalog and tests their seven overloads over two rasters against MobilityDB's
answers: the four forms of rasterUnion as the hex WKB of the united raster and sameAlignmentAgg
as its boolean, among the overloads answering a text, and the two forms of summaryStatsAgg by
the six fields of the summarystats record the aggregate answers, read in Java in the order of
the record, since no SQL function of the surface reads a field of it.

Witness: JMEOS's generator carries the aggregates answering a boolean or a structure and
reading an integer or boolean argument, and MobilityDB reads the shorter raster aggregate forms
as their siblings do, so the three names leave the list of names the surface leaves out.

Measured: the two rows are tile 1 of the union tiles of MobilityDB's 500_raster and the same
tile one tile east, sharing no pixel, so every pixel operation is independent of the order of
the rows; the answers are those MobilityDB gives over them, harvested through its ctest harness:
rasterUnion as ST_AsHexWKB writes it, and summaryStatsAgg (16, 80, 5, 2.7386127875258306, 1, 9)
over band 1 and (18, 900, 50, 25.81988897471611, 10, 90) over band 2.