This topic describes the ST_CostUnion function. This function merges all cost arrays of grids with barriers into a unified array, keeps the highest cost for overlapping grids, ensures that only one cost value is retained, and merges cost arrays of degenerate grids.
Syntax
gridcost[] ST_CostUnion(gridcost[]barriers);Parameters
Parameter | Description |
barriers | The cost array of grids. |
Description
This function merges all cost arrays of grids with barriers into a unified array, keeps the highest cost for overlapping grids, ensures that only one cost value is retained, and merges cost arrays of degenerate grids.
Examples
select st_costunion(array[st_setcost(array[st_gridfromtext('GZ01')],1), st_setcost(array[st_gridfromtext('GZ0')],5)]);
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{"({0102400100000000},5)"}