st_asewkb

這很重要

這項功能目前處於 公開預覽版。

回傳輸入的幾何值，以EWKB格式。

關於對應的 Databricks SQL 函式，請參見 st_asewkb 函數。

語法

from pyspark.databricks.sql import functions as dbf

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

參數

參數	類型	Description
col1	pyspark.sql.Column 或 str	幾何的值。
col2	pyspark.sql.Column 或 str，選用	輸出 EWKB 的可選恩序，適用於 NDR 小端序（預設值）或 XDR 大端序。

範例

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')]