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###############################################################################
# #
# CAST(... AS MULTIPOINT) allows casting geometries of type #
# Point, Linestring, Multipoint and Geometrycollection #
# to type Point. #
# #
# Creation Date: 2020-07-29 #
# Author: Magnus Rushfeldt #
# #
###############################################################################
--echo ###########################################
--echo # Requirement F-10a: #
--echo # CAST(point AS MULTIPOINT) #
--echo ###########################################
--echo #
--echo # Casting from POINT to MULTIPOINT is always allowed.
--echo # Must return MULTIPOINT.
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('POINT(1 1)') AS MULTIPOINT));
--echo # Must return 1.
SELECT ST_EQUALS(ST_GEOMFROMTEXT('MULTIPOINT((1 1))'), CAST(ST_GEOMFROMTEXT('POINT(1 1)') AS MULTIPOINT));
--echo #
--echo ###########################################
--echo # Requirement F-10b: #
--echo # CAST(linestring AS MULTIPOINT) #
--echo ###########################################
--echo #
--echo # Casting from LINESTRING to MULTIPOINT is always allowed.
--echo # Must return MULTIPOINT.
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('LINESTRING(1 1, 2 2)') AS MULTIPOINT));
--echo # Must return 1.
SELECT ST_EQUALS(ST_GEOMFROMTEXT('MULTIPOINT((1 1), (2 2))'), CAST(ST_GEOMFROMTEXT('LINESTRING(1 1, 2 2)') AS MULTIPOINT));
--echo #
--echo ###########################################
--echo # Requirement F-10c: #
--echo # CAST(multipoint AS MULTIPOINT) #
--echo ###########################################
--echo #
--echo # Casting from MULTIPOINT to MULTIPOINT is always allowed.
--echo # Must return MULTIPOINT.
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('MULTIPOINT((1 1), (2 2))') AS MULTIPOINT));
--echo # Must return 1.
SELECT ST_EQUALS(ST_GEOMFROMTEXT('MULTIPOINT((1 1), (2 2))'), CAST(ST_GEOMFROMTEXT('MULTIPOINT((1 1), (2 2))') AS MULTIPOINT));
--echo #
--echo ###########################################
--echo # Requirement F-10d: #
--echo # CAST(geometrycollection AS MULTIPOINT) #
--echo ###########################################
--echo #
--echo # Casting from GEOMETRYCOLLECTION with only points to MULTIPOINT is allowed.
--echo # Must return MULTIPOINT.
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(1 1), POINT(2 2))') AS MULTIPOINT));
--echo # Must return 1.
SELECT ST_EQUALS(ST_GEOMFROMTEXT('MULTIPOINT((1 1), (2 2))'), CAST(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(1 1), POINT(2 2))') AS MULTIPOINT));
--echo #
--echo # Casting from empty GEOMETRYCOLLECTION to MULTIPOINT is not allowed.
--echo # Must raise error.
--error ER_INVALID_CAST_TO_GEOMETRY
DO ST_ASTEXT(CAST(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION()') AS MULTIPOINT));
--echo #
--echo # Casting from GEOMETRYCOLLECTION with not only points to MULTIPOINT is not allowed.
--echo # Must raise error.
--error ER_INVALID_CAST_TO_GEOMETRY
DO ST_ASTEXT(CAST(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(1 1), POINT(2 2), GEOMETRYCOLLECTION())') AS MULTIPOINT));
--echo #
--echo ###########################################
--echo # Requirement F-10e: #
--echo # Disallowed casts to MULTIPOINT #
--echo ###########################################
--echo #
--echo # Casting from POLYGON to MULTIPOINT is not allowed.
--echo # Must raise error.
--error ER_INVALID_CAST_TO_GEOMETRY
DO ST_ASTEXT(CAST(ST_GEOMFROMTEXT('POLYGON((1 1, 4 1, 4 4, 1 4, 1 1), (2 2, 2 3, 3 3, 3 2, 2 2))') AS MULTIPOINT));
--echo #
--echo # Casting from MULTILINESTRING to MULTIPOINT is not allowed.
--echo # Must raise error.
--error ER_INVALID_CAST_TO_GEOMETRY
DO ST_ASTEXT(CAST(ST_GEOMFROMTEXT('MULTILINESTRING((1 1, 2 2), (3 3, 4 4))') AS MULTIPOINT));
--echo #
--echo # Casting from MULTIPOLYGON to MULTIPOINT is not allowed.
--echo # Must raise error.
--error ER_INVALID_CAST_TO_GEOMETRY
DO ST_ASTEXT(CAST(ST_GEOMFROMTEXT('MULTIPOLYGON(((1 1, 4 1, 4 4, 1 4, 1 1)), ((5 5, 5 6, 6 6, 6 5, 5 5)))') AS MULTIPOINT));
--echo #
--echo #############################################
--echo # Testing result of WKT input #
--echo #############################################
--echo #
--echo # Casting from ST_GEOMFROMTEXT(<WKT>) to MULTIPOINT must return expected multipoint.
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('POINT(1 1)') AS MULTIPOINT));
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('LINESTRING(2 2, 3 3)') AS MULTIPOINT));
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('MULTIPOINT((4 4), (5 5))') AS MULTIPOINT));
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(6 6), POINT(7 7))') AS MULTIPOINT));
--echo #
--echo #############################################
--echo # Testing result of user variable input #
--echo #############################################
--echo #
SET @point = ST_GEOMFROMTEXT('POINT(1 1)');
SET @linestring = ST_GEOMFROMTEXT('LINESTRING(2 2, 3 3)');
SET @multipoint = ST_GEOMFROMTEXT('MULTIPOINT((4 4), (5 5))');
SET @geomcollection = ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(6 6), POINT(7 7))');
--echo #
--echo # Casting from geometry in user variable to MULTIPOINT must return expected multipoint.
SELECT ST_ASTEXT(CAST(@point AS MULTIPOINT));
SELECT ST_ASTEXT(CAST(@linestring AS MULTIPOINT));
SELECT ST_ASTEXT(CAST(@multipoint AS MULTIPOINT));
SELECT ST_ASTEXT(CAST(@geomcollection AS MULTIPOINT));
--echo #
--echo #############################################
--echo # Testing result of table column input #
--echo #############################################
--echo #
CREATE TABLE gis_multipoint_castable (fid INTEGER NOT NULL PRIMARY KEY, g GEOMETRY);
INSERT INTO gis_multipoint_castable VALUES
(101, ST_GEOMFROMTEXT('POINT(1 1)')),
(102, ST_GEOMFROMTEXT('LINESTRING(2 2, 3 3)')),
(103, ST_GEOMFROMTEXT('MULTIPOINT((4 4), (5 5))')),
(104, ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(6 6), POINT(7 7))'));
--echo #
--echo # Casting from geometry column to MULTIPOINT must return expected multipoint.
SELECT ST_ASTEXT(CAST(g AS MULTIPOINT)) FROM gis_multipoint_castable;
--echo #
--echo # Cleanup.
DROP TABLE gis_multipoint_castable;
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