Add GeometryCollection dimension cache #1103
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dbaston
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Dec 20, 2024
modules/core/src/main/java/org/locationtech/jts/geom/GeometryCollectionDimension.java
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@dbaston are you able to port this to GEOS? |
Yes, libgeos/geos#1220 |
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Heterogeneous (mixed)
GeometryCollections have to use an O(n) algorithm to determine the dimensions of the elements. This causes performance issues in algorithms which use the dimension of the collection (see #1100).This PR solves this problem by caching the computed dimensions of a GeometryCollection. It adds a single reference to each collection object, but the actual cache is lazily created when dimension information is accessed.
For example, for a
CoverageUnionof a grid of 1M rectangles this improves the performance from 17 s to 370 ms (45x).Fixes #1100