st_dump

Vrátí pole obsahující jednotlivé geometrické prvky ve vstupní geometrii.

Odpovídající funkci SQL Databricks vizte funkcest_dump.

Syntaxe

from pyspark.databricks.sql import functions as dbf

dbf.st_dump(col=<col>)

Parametry

Parameter	Typ	Description
col	pyspark.sql.Column nebo str	Hodnota Geometrie.

Examples

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('MULTILINESTRING((1 2,3 4),(7 8,6 5))',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.explode(dbf.st_dump(dbf.st_geomfromtext('wkt', 3857)))).alias('result')).collect()

[Row(result='SRID=3857;LINESTRING(1 2,3 4)'), Row(result='SRID=3857;LINESTRING(7 8,6 5)')]

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('GEOMETRYCOLLECTION(POINT EMPTY,MULTIPOINT(5 6,EMPTY,3 4))',)], ['wkt'])
df.select(dbf.st_astext(dbf.explode(dbf.st_dump(dbf.st_geomfromtext('wkt')))).alias('result')).collect()

[Row(result='POINT EMPTY'), Row(result='POINT EMPTY'), Row(result='POINT(3 4)'), Row(result='POINT(5 6)')]