******************************************************************************** Changes that were made in July 2006 by Joshua Reich I. ******************************************************************************** Code Cleanup: 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. ******************************************************************************** Changes that were made in August/September 2002 by Bruno Wolff III. ******************************************************************************** Note that this was based on a 7.3 development version and changes may not directly work with earlier versions. I fixed a bug in cubescan.pl that prevented signed numbers with no digits before a decimal point from being accepted. This was submitted as a separate patch and may already be applied. cube_inter should really return NULL if the two cubes don't overlap. However this requires changing to the new calling sequence and I don't know enough about how to do it to make the change. I changed all floats to doubles except for g_cube_penalty which I don't think can be changed to return double. This might cause the penalty to overflow sooner than one might expect, but overflow could have happened even with floats. I changed the output format (in cube_out) to use %.16g instead of %g, since the default is only 6 digits of precision. I changed all of the functions declared with (isstrict) to use the current method of declaring this. I changed all of the externally visible functions to be immutable which they are. I don't think this matters for the gist functions and didn't try to declare them immutable in case there was something tricky about them that I don't understand. I changed the regression tests to use some larger exponents to test output in exponential form. 1e7 was too small for this. I added some regression tests to check for 16 digits of precision. This may or may not be a good idea. I got rid of the swap_corners function. It created scratch boxes that were iterated through and deleted. This is slower than just getting the larger or smaller coordinate as needed, since swap_corners was doing the same thing with the overhead of a function call and memory allocation. I added memset calls to zero out newly allocated NDBOXes as the documentation on functions indicates should be done. This still doesn't allow a hash index for equality since there are multiple representations of the same cube. I got rid of a call to cube_same in cube_lt and cube_gt since the test was redundant with other checks being made. The call to cube_same would only be faster if most of the time you were comparing equivalent cubes. In cube_lt and cube_gt, the second (UR) for loop for comparing extra coordinates to 0 had the wrong range. Note that the cube_distance function wasn't mentioned in the README.cube file. I added regression tests for the cube_distance function. I added the following new functions: cube cube_dim cube_ll_coord cube_ur_coord cube_is_point cube_enlarge cube takes text input and returns a cube. This is useful for making cubes from computed strings. cube_dim returns the number of dimensions stored in the data structure for a cube. This is useful for constraints on the dimensions of a cube. cube_ll_coord returns the nth coordinate value for the lower left corner of a cube. This is useful for doing coordinate transformations. cube_ur_coord returns the nth coordinate value for the upper right corner of a cube. This is useful for doing coordinate transformations. cube_is_point returns true if a cube is also a point. This is true when the two defining corners are the same. cube_enlarge increases the size of a cube by a specified radius in at least n dimensions. If the radius is negative the box is shrunk instead. This is useful for creating bounding boxes around a point for searching for nearby points. All defined dimensions are changed by the radius. If n is greater than the number of defined dimensions and the cube is being increased (r >= 0) then 0 is used as the base for the extra coordinates. LL coordinates are decreased by r and UR coordinates are increased by r. If a LL coordinate is increased to larger than the corresponding UR coordinate (this can only happen when r < 0) than both coordinates are set to their average. I added regression tests for the new functions. I added documentation for cube_distance and the new functions to README.cube as well as making a few other minor changes. I changed create function to create or replace function in the install script. I limited the number of dimensions allowed in cube_enlarge and cube_in to 100 to make it harder for people to mess up the database. The constant is defined in cubedata.h and can be increased if you need something larger. I added grant statements to the install script to make the functions executable to everyone. Bruno Wolff III