st_geometryn

Viktigt!

Den här funktionen finns som allmänt tillgänglig förhandsversion.

Returnerar det 1-baserat n:te elementet i indatamultigeometrin, eller None om det inte finns.

För motsvarande Databricks SQL-funktion, se st_geometryn funktion.

Syntax

from pyspark.databricks.sql import functions as dbf

dbf.st_geometryn(col1=<col1>, col2=<col2>)

Parameterar

Parameter	Typ	Description
col1	pyspark.sql.Column eller str	Ett geometrivärde.
col2	pyspark.sql.Column eller int	Geometrins 1-baserade index som ska returneras.

Examples

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('GEOMETRYCOLLECTION(POINT(4 5),LINESTRING(10 3,24 37,44 85))',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_geometryn(dbf.st_geomfromtext('wkt', 4326), 2)).alias('result')).collect()

[Row(result='SRID=4326;LINESTRING(10 3,24 37,44 85)')]

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('MULTIPOLYGON(EMPTY,((0 0,10 0,0 10,0 0),(1 1,9 1,1 9,1 1)))',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_geometryn(dbf.st_geomfromtext('wkt'), 2)).alias('result')).collect()

[Row(result='POLYGON((0 0,10 0,0 10,0 0),(1 1,9 1,1 9,1 1))')]

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('POINT(1 2)',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_geometryn(dbf.st_geomfromtext('wkt'), 1)).alias('result')).collect()

[Row(result='POINT(1 2)')]