st_asewkb

Důležité

Tato funkce je ve verzi Public Preview.

Vrátí vstupní hodnotu geometrie ve formátu EWKB.

Odpovídající funkci SQL Databricks vizte funkcest_asewkb.

Syntaxe

from pyspark.databricks.sql import functions as dbf

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

Parametry

Parameter	Typ	Description
col1	pyspark.sql.Column nebo str	Hodnota geometrie.
col2	pyspark.sql.Column nebo str, volitelné	Uspořádání bajtů výstupu EWKB je volitelné, NDR pro little-endian (výchozí) nebo XDR pro big-endian.

Examples

from pyspark.databricks.sql import functions as dbf
from pyspark.sql.functions import hex
df = spark.createDataFrame([('LINESTRING(1 2,3 4)',)], ['wkt'])
df.select(hex(dbf.st_asewkb(dbf.st_geomfromtext('wkt'))).alias('result')).collect()

[Row(result='010200000002000000000000000000F03F000000000000004000000000000008400000000000001040')]

from pyspark.databricks.sql import functions as dbf
from pyspark.sql.functions import hex
df = spark.createDataFrame([('LINESTRING(1 2,3 4)', 'NDR',)], ['wkt', 'e'])
df.select(hex(dbf.st_asewkb(dbf.st_geomfromtext('wkt'), df.e)).alias('result')).collect()

[Row(result='010200000002000000000000000000F03F000000000000004000000000000008400000000000001040')]

from pyspark.databricks.sql import functions as dbf
from pyspark.sql.functions import hex
df = spark.createDataFrame([('LINESTRING(1 2,3 4)',)], ['wkt'])
df.select(hex(dbf.st_asewkb(dbf.st_geomfromtext('wkt'), 'XDR')).alias('result')).collect()

[Row(result='0000000002000000023FF0000000000000400000000000000040080000000000004010000000000000')]