[GH-2725] Implement GeoSeries: type, unary_union, delaunay_triangles, voronoi_polygons, disjoint, m

[jiayuasu]

Did you read the Contributor Guide?

• Yes, I have read the Contributor Rules and Contributor Development Guide

Is this PR related to a ticket?

• Yes, and the PR name follows the format [GH-XXX] my subject. Closes Implement GeoSeries: type, unary_union, delaunay_triangles, voronoi_polygons, disjoint, m #2725

What changes were proposed in this PR?

Implement 6 GeoSeries functions for the geopandas compatibility module:

General methods and attributes:

• type (property) — alias for geom_type, returns geometry type names as a Series
• m (property) -> ST_M — returns the M coordinate of point geometries

Constructive methods:

• delaunay_triangles(tolerance, only_edges) -> ST_DelaunayTriangles
• voronoi_polygons(tolerance, extend_to, only_edges) -> ST_VoronoiPolygons

Binary predicates:

• disjoint(other, align) -> ST_Disjoint

Aggregation:

• unary_union (property) — deprecated, delegates to union_all() with FutureWarning

Also fixes GeoDataFrame.type to delegate to geom_type instead of raising NotImplementedError.

Each function follows the established pattern from #2701 and #2710:

• base.py: Docstring with examples + _delegate_to_geometry_column call
• geoseries.py: ST function call via _query_geometry_column or _row_wise_operation
• test_geoseries.py: Unit test with expected values + GeoDataFrame delegation check
• test_match_geopandas_series.py: Comparison test against real geopandas output

Semantic differences documented:

• delaunay_triangles and voronoi_polygons operate per row (each input geometry produces a GeometryCollection), unlike geopandas which collects all vertices across the GeoSeries and computes a single result. This is noted in the docstrings.

Not included (blocked by upstream Sedona bugs):

• geom_equals — ST_Equals throws IllegalArgumentException on GeometryCollection inputs #2722 (ST_Equals crashes on GeometryCollection inputs)
• frechet_distance — ST_FrechetDistance returns 0.0 instead of null for empty geometries #2720 (ST_FrechetDistance returns 0.0 for empty geometries)
• hausdorff_distance — ST_HausdorffDistance returns 0.0 instead of null for empty geometries #2721 (ST_HausdorffDistance returns 0.0 for empty geometries)

How was this patch tested?

12 new tests (6 unit tests + 6 match tests) all passing locally.

Did this PR include necessary documentation updates?

• No, this PR does not affect any public API so no need to change the documentation.

[Copilot]

Pull request overview

Adds several GeoPandas-compatibility APIs to Sedona’s Spark-backed GeoSeries/GeoDataFrame, primarily by delegating to Sedona ST_* functions, plus accompanying unit/match tests to validate behavior.

Changes:

• Implement GeoSeries.type, GeoSeries.m, GeoSeries.delaunay_triangles, GeoSeries.voronoi_polygons, GeoSeries.disjoint, and deprecated GeoSeries.unary_union.
• Fix GeoDataFrame.type to delegate to geom_type.
• Add/expand unit tests and GeoPandas match tests for the above APIs.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
python/sedona/spark/geopandas/base.py	Adds docstrings + delegates for type, delaunay_triangles, voronoi_polygons, unary_union, disjoint.
python/sedona/spark/geopandas/geoseries.py	Implements Sedona-backed execution for type, delaunay_triangles, voronoi_polygons, unary_union, disjoint, m.
python/sedona/spark/geopandas/geodataframe.py	Implements GeoDataFrame.type as alias to geom_type.
python/tests/geopandas/test_geoseries.py	Adds unit tests for the new/updated GeoSeries behaviors.
python/tests/geopandas/test_match_geopandas_series.py	Adds GeoPandas comparison tests (or non-comparison checks where semantics differ).

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Comments suppressed due to low confidence (1)

python/tests/geopandas/test_match_geopandas_series.py:26

• The imports section now includes unused and duplicate imports: pyspark is never referenced in this module, and pyspark.pandas as ps is imported twice. Removing the unused pyspark import and the duplicate ps import will keep the test module clean and avoid lint failures.

import os
import shutil
import tempfile
import warnings
import pytest
import numpy as np
import pandas as pd
import geopandas as gpd
import pyspark.pandas as ps
import pyspark

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

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