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+// Selection of images out of a collection with 15 800x800x8bit
+// images. There is one image each with only 255, 254, 253 as a
+// value. And there is one image each with one value each out of
+// 250, 251, 252. No other image contains value greater than 249.
+
+// one img with some_cell
+
+SELECT img[0:252,0:252]
+FROM earth_64 as img
+WHERE some_cell ( img = 252c )
+
+// two imgs with some_cell
+
+SELECT img[0:252,0:252]
+FROM earth_64 as img
+WHERE some_cell ( img = 252c OR img = 251c )
+
+// three imgs with some_cell
+
+SELECT img[0:252,0:252]
+FROM earth_64 as img
+WHERE some_cell ( img = 252c OR img = 251c OR img = 250c )
+
+// one img with all_cell
+
+SELECT img[0:252,0:252]
+FROM earth_64 as img
+WHERE all_cell ( img >= 255c )
+
+// two imgs with all_cell
+
+SELECT img[0:252,0:252]
+FROM earth_64 as img
+WHERE all_cell ( img >= 254c )
+
+// three imgs with all_cell
+
+SELECT img[0:252,0:252]
+FROM earth_64 as img
+WHERE all_cell ( img >= 253c )
+