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Applies to: 
Databricks Runtime 17.3 and above
Important
This feature is in Public Preview.
Returns an array containing the single geometries in the input geometry.
Syntax
st_dump ( geoExpr )
Arguments
geoExpr: AGEOMETRYvalue.
Returns
A value of type ARRAY whose elements are of the same type as geoExpr. The output array contains the single geometries in the input GEOMETRY value.
If the input GEOMETRY value is a point, linestring, or polygon, an array containing the input GEOMETRY value is returned.
If the input GEOMETRY value is an empty multipoint, multilinestring, multipolygon, or geometry collection, an empty array is returned.
The SRID value of the GEOMETRY values in the output array is the same as that of the input GEOMETRY value.
The function returns NULL if the input is NULL.
Examples
> SELECT st_asewkt(g) FROM (SELECT explode(st_dump(st_geomfromtext('MULTILINESTRING((1 2,3 4),(7 8,6 5))', 3857))) g) ORDER BY 1;
SRID=3857;LINESTRING(1 2,3 4)
SRID=3857;LINESTRING(7 8,6 5)
> SELECT st_astext(g) FROM (SELECT explode(st_dump(st_geomfromtext('GEOMETRYCOLLECTION(POINT EMPTY,MULTIPOINT(5 6,EMPTY,3 4))'))) g) ORDER BY 1;
POINT EMPTY
POINT EMPTY
POINT(3 4)
POINT(5 6)