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###############################################################################
# #
# CAST(... AS MULTILINESTRING) allows casting geometries of type #
# LINESTRING, POLYGON, MULTILINESTRING, MULTIPOLYGON and GEOMETRYCOLLECTION #
# to type MULTILINESTRING. #
# #
# Creation Date: 2020-08-02 #
# Author: Magnus Rushfeldt #
# #
###############################################################################
--echo #################################################
--echo # Requirement F-11a: #
--echo # CAST(linestring AS MULTILINESTRING) #
--echo #################################################
--echo #
--echo # Casting from LINESTRING to MULTILINESTRING is always allowed.
--echo # Must return Multilinestring.
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('LINESTRING(1 1, 2 2)') AS MULTILINESTRING));
--echo # Must return 1.
SELECT ST_EQUALS(ST_GEOMFROMTEXT('MULTILINESTRING((1 1, 2 2))'), CAST(ST_GEOMFROMTEXT('LINESTRING(1 1, 2 2)') AS MULTILINESTRING));
--echo #
--echo #################################################
--echo # Requirement F-11b: #
--echo # CAST(polygon AS MULTILINESTRING) #
--echo #################################################
--echo #
--echo # Casting from POLYGON to MULTILINESTRING is always allowed.
--echo # Must return multilinestring.
SELECT 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 MULTILINESTRING));
--echo # Must return 1.
SELECT ST_EQUALS(ST_GEOMFROMTEXT('MULTILINESTRING((1 1, 4 1, 4 4, 1 4, 1 1), (2 2, 2 3, 3 3, 3 2, 2 2))'), 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 MULTILINESTRING));
--echo #
--echo #################################################
--echo # Requirement F-11c: #
--echo # CAST(multilinestring AS MULTILINESTRING) #
--echo #################################################
--echo #
--echo # Casting from MULTILINESTRING to MULTILINESTRING is always allowed.
--echo # Must return Multilinestring.
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('MULTILINESTRING((1 1, 2 2), (3 3, 4 4))') AS MULTILINESTRING));
--echo # Must return 1.
SELECT ST_EQUALS(ST_GEOMFROMTEXT('MULTILINESTRING((1 1, 2 2), (3 3, 4 4))'), CAST(ST_GEOMFROMTEXT('MULTILINESTRING((1 1, 2 2), (3 3, 4 4))') AS MULTILINESTRING));
--echo #
--echo #
--echo #################################################
--echo # Requirement F-11d: #
--echo # CAST(multipolygon AS MULTILINESTRING) #
--echo #################################################
--echo #
--echo # Casting from MULTIPOLYGON with only exterior ring polygons to MULTILINESTRING is allowed.
--echo # Must return Multilinestring.
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('MULTIPOLYGON(((1 1, 2 1, 2 2, 1 2, 1 1)), ((3 3, 4 3, 4 4, 3 4, 3 3)))') AS MULTILINESTRING));
--echo # Must return 1.
SELECT ST_EQUALS(ST_GEOMFROMTEXT('MULTILINESTRING((1 1, 2 1, 2 2, 1 2, 1 1), (3 3, 4 3, 4 4, 3 4, 3 3))'), CAST(ST_GEOMFROMTEXT('MULTIPOLYGON(((1 1, 2 1, 2 2, 1 2, 1 1)), ((3 3, 4 3, 4 4, 3 4, 3 3)))') AS MULTILINESTRING));
--echo #
--echo # Casting from MULTIPOLYGON with interior-ring polygons to MULTILINESTRING 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), (2 2, 2 3, 3 3, 3 2, 2 2)), ((1 1, 2 1, 2 2, 1 2, 1 1)))') AS MULTILINESTRING));
--echo #
--echo #################################################
--echo # Requirement F-11e: #
--echo # CAST(geometrycollection AS MULTILINESTRING) #
--echo #################################################
--echo #
--echo # Casting from GEOMETRYCOLLECTION with only linestrings to MULTILINESTRING is allowed.
--echo # Must return MULTILINESTRING.
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(LINESTRING(1 1, 2 2), LINESTRING(3 3, 4 4))') AS MULTILINESTRING));
--echo # Must return 1.
SELECT ST_EQUALS(ST_GEOMFROMTEXT('MULTILINESTRING((1 1, 2 2), (3 3, 4 4))'), CAST(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(LINESTRING(1 1, 2 2), LINESTRING(3 3, 4 4))') AS MULTILINESTRING));
--echo #
--echo # Casting from empty GEOMETRYCOLLECTION to MULTILINESTRING is not allowed.
--echo # Must raise error.
--error ER_INVALID_CAST_TO_GEOMETRY
DO ST_ASTEXT(CAST(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION()') AS MULTILINESTRING));
--echo #
--echo # Casting from GEOMETRYCOLLECTION with not only linestrings to MULTILINESTRING is not allowed.
--echo # Must raise error.
--error ER_INVALID_CAST_TO_GEOMETRY
DO ST_ASTEXT(CAST(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(LINESTRING(1 1, 2 2), LINESTRING(3 3, 4 4), GEOMETRYCOLLECTION())') AS MULTILINESTRING));
--echo #
--echo ############################################
--echo # Requirement F-11f: #
--echo # Disallowed casts to MULTILINESTRING #
--echo ############################################
--echo #
--echo # Casting from POINT to MULTILINESTRING is not allowed.
--echo # Must raise error.
--error ER_INVALID_CAST_TO_GEOMETRY
DO ST_ASTEXT(CAST(ST_GEOMFROMTEXT('POINT(1 1)') AS MULTILINESTRING));
--echo #
--echo # Casting from MULTIPOINT to MULTILINESTRING is not allowed.
--echo # Must raise error.
--error ER_INVALID_CAST_TO_GEOMETRY
DO ST_ASTEXT(CAST(ST_GEOMFROMTEXT('MULTIPOINT((1 1), (2 2))') AS MULTILINESTRING));
--echo #
--echo #############################################
--echo # Testing result of WKT input #
--echo #############################################
--echo #
--echo # Casting from ST_GEOMFROMTEXT(<WKT>) to MULTILINESTRING must return expected linestring.
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('LINESTRING(1 1, 2 2)') AS MULTILINESTRING));
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('POLYGON((3 3, 4 3, 4 4, 3 4, 3 3))') AS MULTILINESTRING));
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('MULTILINESTRING((5 5, 6 6), (7 7, 8 8))') AS MULTILINESTRING));
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('MULTIPOLYGON(((9 9, 10 9, 10 10, 9 10, 9 9)), ((11 11, 12 11, 12 12, 12 12, 11 11)))') AS MULTILINESTRING));
SELECT ST_ASTEXT(CAST(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(LINESTRING(13 13, 14 14), LINESTRING(15 15, 16 16))') AS MULTILINESTRING));
--echo #
--echo #############################################
--echo # Testing result of user variable input #
--echo #############################################
--echo #
SET @linestring = ST_GEOMFROMTEXT('LINESTRING(1 1, 2 2)');
SET @polygon = ST_GEOMFROMTEXT('POLYGON((3 3, 4 3, 4 4, 3 4, 3 3))');
SET @multilinestring = ST_GEOMFROMTEXT('MULTILINESTRING((5 5, 6 6), (7 7, 8 8))');
SET @multipolygon = ST_GEOMFROMTEXT('MULTIPOLYGON(((9 9, 10 9, 10 10, 9 10, 9 9)), ((11 11, 12 11, 12 12, 12 12, 11 11)))');
SET @geomcollection = ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(LINESTRING(13 13, 14 14), LINESTRING(15 15, 16 16))');
--echo #
--echo # Casting from geometry in user variable to MULTILINESTRING must return expected multilinestring.
SELECT ST_ASTEXT(CAST(@linestring AS MULTILINESTRING));
SELECT ST_ASTEXT(CAST(@polygon AS MULTILINESTRING));
SELECT ST_ASTEXT(CAST(@multilinestring AS MULTILINESTRING));
SELECT ST_ASTEXT(CAST(@multipolygon AS MULTILINESTRING));
SELECT ST_ASTEXT(CAST(@geomcollection AS MULTILINESTRING));
--echo #
--echo #############################################
--echo # Testing result of table column input #
--echo #############################################
--echo #
CREATE TABLE gis_multilinestring_castable (fid INTEGER NOT NULL PRIMARY KEY, g GEOMETRY);
INSERT INTO gis_multilinestring_castable VALUES
(101, ST_GEOMFROMTEXT('LINESTRING(1 1, 2 2)')),
(102, ST_GEOMFROMTEXT('POLYGON((3 3, 4 3, 4 4, 3 4, 3 3))')),
(103, ST_GEOMFROMTEXT('MULTILINESTRING((5 5, 6 6), (7 7, 8 8))')),
(104, ST_GEOMFROMTEXT('MULTIPOLYGON(((9 9, 10 9, 10 10, 9 10, 9 9)), ((11 11, 12 11, 12 12, 12 12, 11 11)))')),
(105, ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(LINESTRING(13 13, 14 14), LINESTRING(15 15, 16 16))'));
--echo #
--echo # Casting from geometry column to MULTILINESTRING must return expected multilinestring.
SELECT ST_ASTEXT(CAST(g AS MULTILINESTRING)) FROM gis_multilinestring_castable;
--echo #
--echo # Cleanup.
DROP TABLE gis_multilinestring_castable;
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