st_boundary

Returns the boundary of the input geometry as a geometry.

For the corresponding Databricks SQL function, see st_boundary function.

Syntax

from pyspark.databricks.sql import functions as dbf

dbf.st_boundary(col=<col>)

Parameters

Parameter	Type	Description
col	pyspark.sql.Column or str	A Geometry value.

Examples

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('POLYGON((0 0,10 0,10 10,0 10,0 0),(2 2,8 2,8 8,2 8,2 2))',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_boundary(dbf.st_geomfromtext('wkt', 3857))).alias('result')).collect()

[Row(result='SRID=3857;MULTILINESTRING((0 0,10 0,10 10,0 10,0 0),(2 2,8 2,8 8,2 8,2 2))')]