Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
Important
This feature is in Public Preview.
Returns the 1-based n-th point of the input linestring, or None if it doesn't exist.
For the corresponding Databricks SQL function, see st_pointn function.
Syntax
from pyspark.databricks.sql import functions as dbf
dbf.st_pointn(col1=<col1>, col2=<col2>)
Parameters
| Parameter | Type | Description |
|---|---|---|
col1 |
pyspark.sql.Column or str |
A Geography or Geometry value representing a linestring. |
col2 |
pyspark.sql.Column or int |
A 1-based position in the linestring indicating the point that should be returned. |
Examples
from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('LINESTRING(1 2,3 4,5 6)',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_pointn(dbf.st_geogfromtext('wkt'), 3)).alias('result')).collect()
[Row(result='SRID=4326;POINT(5 6)')]
from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('LINESTRING ZM (1 2 3 4,5 6 7 8)',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_pointn(dbf.st_geomfromtext('wkt', 4326), -2)).alias('result')).collect()
[Row(result='SRID=4326;POINT ZM (1 2 3 4)')]