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/contrib/cube improvements:

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Update the calling convention for all external facing functions. By
external facing, I mean all functions that are directly referenced in
cube.sql. Prior to my update, all functions used the older V0 calling
convention. They now use V1.

New Functions:

cube(float[]), which makes a zero volume cube from a float array

cube(float[], float[]), which allows the user to create a cube from
two float arrays; one for the upper right and one for the lower left
coordinate.

cube_subset(cube, int4[]), to allow you to reorder or choose a subset of
dimensions from a cube, using index values specified in the array.

Joshua Reich
This commit is contained in:
Bruce Momjian
2006-07-25 23:23:45 +00:00
parent e6284649b9
commit 796de9c1ed
7 changed files with 663 additions and 197 deletions
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24
contrib/cube/README.cube
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@ -244,6 +244,16 @@ cube(float8, float8) returns cube
This makes a one dimensional cube.
cube(1,2) == '(1),(2)'
cube(float8[]) returns cube
This makes a zero-volume cube using the coordinates defined by the
array.
cube(ARRAY[1,2]) == '(1,2)'
cube(float8[], float8[]) returns cube
This makes a cube, with upper right and lower left coordinates as
defined by the 2 float arrays. Arrays must be of the same length.
cube('{1,2}'::float[], '{3,4}'::float[]) == '(1,2),(3,4)'
cube(cube, float8) returns cube
This builds a new cube by adding a dimension on to an existing cube with
the same values for both parts of the new coordinate. This is useful for
@ -267,6 +277,13 @@ cube_ur_coord(cube, int) returns double
cube_ur_coord returns the nth coordinate value for the upper right corner
of a cube. This is useful for doing coordinate transformations.
cube_subset(cube, int[]) returns cube
Builds a new cube from an existing cube, using a list of dimension indexes
from an array. Can be used to find both the ll and ur coordinate of single
dimenion, e.g.: cube_subset(cube('(1,3,5),(6,7,8)'), ARRAY[2]) = '(3),(7)'
Or can be used to drop dimensions, or reorder them as desired, e.g.:
cube_subset(cube('(1,3,5),(6,7,8)'), ARRAY[3,2,1,1]) = '(5, 3, 1, 1),(8, 7, 6, 6)'
cube_is_point(cube) returns bool
cube_is_point returns true if a cube is also a point. This is true when the
two defining corners are the same.
@ -327,3 +344,10 @@ in August/September of 2002.
These include changing the precision from single precision to double
precision and adding some new functions.
------------------------------------------------------------------------
Additional updates were made by Joshua Reich <josh@root.net> in July 2006.
These include cube(float8[], float8[]) and cleaning up the code to use
the V1 call protocol instead of the deprecated V0 form.