snowflake.snowpark.functions.st_startpoint¶

snowflake.snowpark.functions.st_startpoint(geography_or_geometry_expression: Union[snowflake.snowpark.column.Column, str]) → Column[source]¶

Returns the first point of a LINESTRING geography or geometry object as a POINT object.

Parameters:

geography_or_geometry_expression (ColumnOrName) – The LINESTRING geography or geometry object

Returns:

The POINT objects representing the start point of the input LINESTRING

Return type:

Column

Examples::

>>> from snowflake.snowpark.functions import to_geography, to_geometry
>>> df_geography = session.create_dataframe([["LINESTRING(1 1, 2 2, 3 3, 4 4)"]], schema=["linestring"])
>>> df_geography.select(st_startpoint(to_geography(df_geography["linestring"])).alias("startpoint")).collect()
[Row(STARTPOINT='{\n  "coordinates": [\n    1.000000000000000e+00,\n    1.000000000000000e+00\n  ],\n  "type": "Point"\n}')]
>>> df_geometry = session.create_dataframe([["LINESTRING(1 1, 2 2, 3 3, 4 4)"]], schema=["linestring"])
>>> df_geometry.select(st_startpoint(to_geometry(df_geometry["linestring"])).alias("startpoint")).collect()
[Row(STARTPOINT='{\n  "coordinates": [\n    1.000000000000000e+00,\n    1.000000000000000e+00\n  ],\n  "type": "Point"\n}')]

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