jiayuasu commented on code in PR #2766:
URL: https://github.com/apache/sedona/pull/2766#discussion_r2958150490
##########
python/sedona/spark/geopandas/geoseries.py:
##########
@@ -1151,6 +1151,71 @@ def line_merge(self, directed=False):
returns_geom=True,
)
+ def build_area(self, node=True):
+ if len(self) == 0:
+ return GeoSeries([], name="polygons", crs=self.crs)
+
+ if node:
+ aggr_expr = sta.ST_Union_Aggr(self.spark.column)
+ else:
+ aggr_expr = sta.ST_Collect_Agg(self.spark.column)
+
+ build_expr = stf.ST_BuildArea(aggr_expr)
+ dump_expr = F.explode(stf.ST_Dump(build_expr))
+
+ sdf = self._internal.spark_frame.select(dump_expr.alias("polygons"))
+
+ if not sdf.take(1):
+ return GeoSeries([], name="polygons", crs=self.crs)
+
Review Comment:
`take(1)` is a lightweight Spark action (reads a single partition, no
shuffle). We need it here because geopandas returns an empty `GeoSeries([],
Name: polygons)` for non-closing linework, and removing the check would lose
the `name="polygons"` metadata. Keeping it.
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