st_removepoint function
Applies to: 
Databricks SQL Databricks Runtime 17.1 and above
Preview
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nota
This feature is not available on Databricks SQL Classic warehouses. To learn more about Databricks SQL warehouses, see SQL warehouse types
Removes the n-th point from the input linestring GEOGRAPHY or GEOMETRY.
Syntax
st_removepoint ( geoExpr, indexExpr )
Arguments
geoExpr: AGEOGRAPHYorGEOMETRYvalue representing a linestring.indexExpr: AnINTEGERvalue indicating the 1-based position in the linestring of the point that should be removed.
Returns
A value of type GEOGRAPHY or GEOMETRY, representing the linestring after the point at the indexExpr-th position has been removed.
The SRID value of the output linestring is equal to that of the input GEOGRAPHY or GEOMETRY value.
The dimension of the output linestring is the same as that of the input GEOGRAPHY or GEOMETRY value.
The function returns NULL if any of the inputs is NULL.
Error conditions
- If the value of
geoExpris not a linestring or is an empty linestring, the function returns ST_INVALID_ARGUMENT.INVALID_TYPE. - If the absolute value of the value of
indexExpris 0 or larger than the number of points in the linestring, the function returns ST_INVALID_ARGUMENT.INVALID_INDEX_VALUE.
Examples
SQL
-- Returns the linestring after removing the second point counting from the left.
> SELECT st_astext(st_removepoint(st_geomfromtext('LINESTRING(1 2,3 4,5 6)'), 2));
LINESTRING(1 2,5 6)
-- Returns the linestring after removing the first point counting from the right.
> SELECT st_asewkt(st_removepoint(st_geogfromtext('LINESTRING(1 2,3 4,5 6)'), -1));
SRID=4326;LINESTRING(1 2,3 4)