Aggregator (Flink)

ST_Envelope_Agg

Introduction: Return the entire envelope boundary of all geometries in A. Empty geometries and null values are skipped. If all inputs are empty or null, the result is null. This behavior is consistent with PostGIS's ST_Extent.

Format: ST_Envelope_Agg (A: geometryColumn)

Since: v1.3.0

Note

This function was previously named ST_Envelope_Aggr, which is deprecated since v1.8.1.

Example:

SELECT ST_Envelope_Agg(ST_GeomFromText('MULTIPOINT(1.1 101.1,2.1 102.1,3.1 103.1,4.1 104.1,5.1 105.1,6.1 106.1,7.1 107.1,8.1 108.1,9.1 109.1,10.1 110.1)'))

Output:

POLYGON ((1.1 101.1, 1.1 120.1, 20.1 120.1, 20.1 101.1, 1.1 101.1))

ST_Intersection_Agg

Introduction: Return the polygon intersection of all polygons in A

Format: ST_Intersection_Agg (A: geometryColumn)

Since: v1.5.0

Note

This function was previously named ST_Intersection_Aggr, which is deprecated since v1.8.1.

Example:

SELECT ST_Intersection_Agg(ST_GeomFromText('MULTIPOINT(1.1 101.1,2.1 102.1,3.1 103.1,4.1 104.1,5.1 105.1,6.1 106.1,7.1 107.1,8.1 108.1,9.1 109.1,10.1 110.1)'))

Output:

MULTIPOINT ((1.1 101.1), (2.1 102.1), (3.1 103.1), (4.1 104.1), (5.1 105.1), (6.1 106.1), (7.1 107.1), (8.1 108.1), (9.1 109.1), (10.1 110.1))

ST_Union_Agg

Introduction: Return the polygon union of all polygons in A. All inputs must be polygons.

Format: ST_Union_Agg (A: geometryColumn)

Since: v1.3.0

Note

This function was previously named ST_Union_Aggr, which is deprecated since v1.8.1.

Example:

SELECT ST_Union_Agg(ST_GeomFromText('MULTIPOINT(1.1 101.1,2.1 102.1,3.1 103.1,4.1 104.1,5.1 105.1,6.1 106.1,7.1 107.1,8.1 108.1,9.1 109.1,10.1 110.1)'))

Output:

MULTIPOINT ((1.1 101.1), (2.1 102.1), (3.1 103.1), (4.1 104.1), (5.1 105.1), (6.1 106.1), (7.1 107.1), (8.1 108.1), (9.1 109.1), (10.1 110.1))