[raster] Using a CTE causes process to fail

[Bborie Park]

The following query causes the postgresql process to abort.

WITH foo AS (
	SELECT
		ST_AddBand(
			ST_MakeEmptyRaster(10, 10, 10, 10, 2, 2, 0, 0,-1)
			, 1, '64BF', 0, 0
		)
	AS rast
)
SELECT rast FROM foo

The crash relates to the ST_AddBand as the following does not cause an abort.

WITH foo AS (
	SELECT
		ST_MakeEmptyRaster(10, 10, 10, 10, 2, 2, 0, 0,-1)
	AS rast
)
SELECT rast FROM foo

[Bborie Park]

This appears to be directly related to setting the band pixel type to 64BF as any other pixel type does not cause the abort.

[Bborie Park]

Message received on abort is:

postgres: rt_api.c:5040: rt_raster_deserialize: Assertion `!(((uintptr_t) ptr) % pixbytes)' failed.

[Bborie Park]

This exception only affects 32-bit builds on both PostgreSQL 8.4 and 9.0.

[Bborie Park]

Resolved in r7597. Expression in assertion tests changed to be "relative" rather than "absolute".