FIX - rasql OVERLAY returns incorrect results

[Bang Pham Huu]

`Import the two coverages (provided by OGC CITE WMS 1.3.0 tests) in ​attachment:

• Buildings: two small pink rectangles at the top right
• MapNeatline: the dark-red rectangle which covers Buildings

then check the query (WMS from OGC CITE: layers=Buildings,MapNeatline, hence rasql Buildings OVERLAY MapNeatline):

rasql -q 'SELECT ENCODE( (  (  EXTEND ( scale( scale( scale( ( ( c0[0:894,0:814] ) ), [0:799, 0:399] )  [0:799, 0:399], [0:399, 0:199] ), [0:67, 0:61] ), [-230:169, -39:160] ) )  )    OVERLAY (  (  EXTEND ( scale( scale( scale( ( ( c1[0:894,0:814] ) ), [0:799, 0:320] )  [0:799, 61:259], [0:399, 0:199] ), [0:352, 0:199] ), [-23:376, 0:199] ) )  ) , "png", "{}") FROM Buildings AS c0, MapNeatline AS c1' --out file

• The result is incorrect as Buildings layer doesn't show at all and it is hidden by MapNeatline layer.
  • It should show two pink rectangles on the MapNeatline.

[Dimitar Misev]

The attached ingredients don't work, please fix them first.

[Bang Pham Huu]

tiff files are added to ​http://rasdaman.org/attachment/ticket/2750/temp_ingredients.zip

[Dimitar Misev]

The query is wrong: it should be map overlay buildings - to put the buildings on top of map. But the query in this ticket is buildings overlay map.

[Bang Pham Huu]

@Dimitar: this ticket is not wrong, you misunderstood about it.

[Dimitar Misev]

Indeed the generated rasql is correct, I suspect scale or extend do not copy the null values - or some other issue.

[Dimitar Misev]

The null values in the json files are 0 which is incorrect. These files have mostly "255 255 255 0" as value = null value. So the null set should be [255,0].

Unfortunately it doesn't seem to work well.

rasql -q 'select count_cells(c0 is null) from MapNeatline as c0' --out string

  Result element 1: { 0, 0, 0, 0 }

This should print some non-zero values. There's probably a bug in evaluating operations on composite arrays with null values.