@Description("Returns a geometry that represents the point set union of the input geometries.")
    @ScalarFunction("ST_Union")
    @SqlType(GEOMETRY_TYPE_NAME)
    public static Slice stUnion(@SqlType(GEOMETRY_TYPE_NAME) Slice left, @SqlType(GEOMETRY_TYPE_NAME) Slice right)
    {
        return stUnion(ImmutableList.of(left, right));
    }
@Test
    public void testSTUnion()
    {
        List<String> emptyWkts =
                ImmutableList.of(
                        "POINT EMPTY",
                        "MULTIPOINT EMPTY",
                        "LINESTRING EMPTY",
                        "MULTILINESTRING EMPTY",
                        "POLYGON EMPTY",
                        "MULTIPOLYGON EMPTY",
                        "GEOMETRYCOLLECTION EMPTY");
        List<String> simpleWkts =
                ImmutableList.of(
                        "POINT (1 2)",
                        "MULTIPOINT ((1 2), (3 4))",
                        "LINESTRING (0 0, 2 2, 4 4)",
                        "MULTILINESTRING ((0 0, 2 2, 4 4), (5 5, 7 7, 9 9))",
                        "POLYGON ((0 0, 0 1, 1 1, 1 0, 0 0))",
                        "MULTIPOLYGON (((1 1, 1 3, 3 3, 3 1, 1 1)), ((2 4, 2 6, 6 6, 6 4, 2 4)))",
                        "GEOMETRYCOLLECTION (LINESTRING (0 5, 5 5), POLYGON ((1 1, 1 3, 3 3, 3 1, 1 1)))");

        // empty geometry
        for (String emptyWkt : emptyWkts) {
            for (String simpleWkt : simpleWkts) {
                assertUnion(emptyWkt, simpleWkt, simpleWkt);
            }
        }

        // self union
        for (String simpleWkt : simpleWkts) {
            assertUnion(simpleWkt, simpleWkt, simpleWkt);
        }

        // touching union
        assertUnion("POINT (1 2)", "MULTIPOINT ((1 2), (3 4))", "MULTIPOINT ((1 2), (3 4))");
        assertUnion("MULTIPOINT ((1 2))", "MULTIPOINT ((1 2), (3 4))", "MULTIPOINT ((1 2), (3 4))");
        assertUnion("LINESTRING (0 1, 1 2)", "LINESTRING (1 2, 3 4)", "LINESTRING (0 1, 1 2, 3 4)");
        assertUnion("MULTILINESTRING ((0 0, 2 2, 4 4), (5 5, 7 7, 9 9))", "MULTILINESTRING ((5 5, 7 7, 9 9), (11 11, 13 13, 15 15))", "MULTILINESTRING ((0 0, 2 2, 4 4), (5 5, 7 7, 9 9), (11 11, 13 13, 15 15))");
        assertUnion("POLYGON ((0 0, 0 1, 1 1, 1 0, 0 0))", "POLYGON ((1 0, 2 0, 2 1, 1 1, 1 0))", "POLYGON ((0 0, 0 1, 1 1, 2 1, 2 0, 1 0, 0 0))");
        assertUnion("MULTIPOLYGON (((0 0, 0 1, 1 1, 1 0, 0 0)))", "MULTIPOLYGON (((1 0, 2 0, 2 1, 1 1, 1 0)))", "POLYGON ((0 0, 0 1, 1 1, 2 1, 2 0, 1 0, 0 0))");
        assertUnion("GEOMETRYCOLLECTION (POLYGON ((0 0, 0 1, 1 1, 1 0, 0 0)), POINT (1 2))", "GEOMETRYCOLLECTION (POLYGON ((1 0, 2 0, 2 1, 1 1, 1 0)), MULTIPOINT ((1 2), (3 4)))", "GEOMETRYCOLLECTION (MULTIPOINT ((1 2), (3 4)), POLYGON ((0 0, 0 1, 1 1, 2 1, 2 0, 1 0, 0 0)))");

        // within union
        assertUnion("MULTIPOINT ((20 20), (25 25))", "POINT (25 25)", "MULTIPOINT ((20 20), (25 25))");
        assertUnion("LINESTRING (20 20, 30 30)", "POINT (25 25)", "LINESTRING (20 20, 25 25, 30 30)");
        assertUnion("LINESTRING (20 20, 30 30)", "LINESTRING (25 25, 27 27)", "LINESTRING (20 20, 25 25, 27 27, 30 30)");
        assertUnion("POLYGON ((0 0, 0 4, 4 4, 4 0, 0 0))", "POLYGON ((1 1, 1 2, 2 2, 2 1, 1 1))", "POLYGON ((0 0, 0 4, 4 4, 4 0, 0 0))");
        assertUnion("MULTIPOLYGON (((0 0, 0 2, 2 2, 2 0, 0 0)), ((2 2, 2 4, 4 4, 4 2, 2 2)))", "POLYGON ((2 2, 2 3, 3 3, 3 2, 2 2))", "MULTIPOLYGON (((2 2, 2 3, 2 4, 4 4, 4 2, 3 2, 2 2)), ((0 0, 0 2, 2 2, 2 0, 0 0)))");
        assertUnion("GEOMETRYCOLLECTION (POLYGON ((0 0, 0 4, 4 4, 4 0, 0 0)), MULTIPOINT ((20 20), (25 25)))", "GEOMETRYCOLLECTION (POLYGON ((1 1, 1 2, 2 2, 2 1, 1 1)), POINT (25 25))", "GEOMETRYCOLLECTION (MULTIPOINT ((20 20), (25 25)), POLYGON ((0 0, 0 4, 4 4, 4 0, 0 0)))");

        // overlap union
        assertUnion("LINESTRING (1 1, 3 1)", "LINESTRING (2 1, 4 1)", "LINESTRING (1 1, 2 1, 3 1, 4 1)");
        assertUnion("MULTILINESTRING ((1 1, 3 1))", "MULTILINESTRING ((2 1, 4 1))", "LINESTRING (1 1, 2 1, 3 1, 4 1)");
        assertUnion("POLYGON ((1 1, 3 1, 3 3, 1 3, 1 1))", "POLYGON ((2 2, 4 2, 4 4, 2 4, 2 2))", "POLYGON ((1 1, 1 3, 2 3, 2 4, 4 4, 4 2, 3 2, 3 1, 1 1))");
        assertUnion("MULTIPOLYGON (((1 1, 3 1, 3 3, 1 3, 1 1)))", "MULTIPOLYGON (((2 2, 4 2, 4 4, 2 4, 2 2)))", "POLYGON ((1 1, 1 3, 2 3, 2 4, 4 4, 4 2, 3 2, 3 1, 1 1))");
        assertUnion("GEOMETRYCOLLECTION (POLYGON ((1 1, 3 1, 3 3, 1 3, 1 1)), LINESTRING (1 1, 3 1))", "GEOMETRYCOLLECTION (POLYGON ((2 2, 4 2, 4 4, 2 4, 2 2)), LINESTRING (2 1, 4 1))", "GEOMETRYCOLLECTION (LINESTRING (3 1, 4 1), POLYGON ((1 1, 1 3, 2 3, 2 4, 4 4, 4 2, 3 2, 3 1, 2 1, 1 1)))");

        // Union hanging bug: https://github.com/Esri/geometry-api-java/issues/266
        assertUnion(
                "POINT (-44.16176186699087 -19.943264803833348)",
                "LINESTRING (-44.1247493 -19.9467657, -44.1247979 -19.9468385, -44.1249043 -19.946934, -44.1251096 -19.9470651, -44.1252609 -19.9471383, -44.1254992 -19.947204, -44.1257652 -19.947229, -44.1261292 -19.9471833, -44.1268946 -19.9470098, -44.1276847 -19.9468416, -44.127831 -19.9468143, -44.1282639 -19.9467366, -44.1284569 -19.9467237, -44.1287119 -19.9467261, -44.1289437 -19.9467665, -44.1291499 -19.9468221, -44.1293856 -19.9469396, -44.1298857 -19.9471497, -44.1300908 -19.9472071, -44.1302743 -19.9472331, -44.1305029 -19.9472364, -44.1306498 -19.9472275, -44.1308054 -19.947216, -44.1308553 -19.9472037, -44.1313206 -19.9471394, -44.1317889 -19.9470854, -44.1330422 -19.9468887, -44.1337465 -19.9467083, -44.1339922 -19.9466842, -44.1341506 -19.9466997, -44.1343621 -19.9467226, -44.1345134 -19.9467855, -44.1346494 -19.9468456, -44.1347295 -19.946881, -44.1347988 -19.9469299, -44.1350231 -19.9471131, -44.1355843 -19.9478307, -44.1357802 -19.9480557, -44.1366289 -19.949198, -44.1370384 -19.9497001, -44.137386 -19.9501921, -44.1374113 -19.9502263, -44.1380888 -19.9510925, -44.1381769 -19.9513526, -44.1382509 -19.9516202, -44.1383014 -19.9522136, -44.1383889 -19.9530931, -44.1384227 -19.9538784, -44.1384512 -19.9539653, -44.1384555 -19.9539807, -44.1384901 -19.9541928, -44.1385563 -19.9543859, -44.1386656 -19.9545781, -44.1387339 -19.9546889, -44.1389219 -19.9548661, -44.1391695 -19.9550384, -44.1393672 -19.9551414, -44.1397538 -19.9552208, -44.1401714 -19.9552332, -44.1405656 -19.9551143, -44.1406198 -19.9550853, -44.1407579 -19.9550224, -44.1409029 -19.9549201, -44.1410283 -19.9548257, -44.1413902 -19.9544132, -44.141835 -19.9539274, -44.142268 -19.953484, -44.1427036 -19.9531023, -44.1436229 -19.952259, -44.1437568 -19.9521565, -44.1441783 -19.9517273, -44.144644 -19.9512109, -44.1452538 -19.9505663, -44.1453541 -19.9504774, -44.1458653 -19.9500442, -44.1463563 -19.9496473, -44.1467534 -19.9492812, -44.1470553 -19.9490028, -44.1475804 -19.9485293, -44.1479838 -19.9482096, -44.1485003 -19.9478532, -44.1489451 -19.9477314, -44.1492225 -19.9477024, -44.149453 -19.9476684, -44.149694 -19.9476387, -44.1499556 -19.9475436, -44.1501398 -19.9474234, -44.1502723 -19.9473206, -44.150421 -19.9471473, -44.1505043 -19.9470004, -44.1507664 -19.9462594, -44.150867 -19.9459518, -44.1509225 -19.9457843, -44.1511168 -19.945466, -44.1513601 -19.9452272, -44.1516846 -19.944999, -44.15197 -19.9448738, -44.1525994 -19.9447263, -44.1536614 -19.9444791, -44.1544071 -19.9442671, -44.1548978 -19.9441275, -44.1556247 -19.9438304, -44.1565996 -19.9434083, -44.1570351 -19.9432556, -44.1573142 -19.9432091, -44.1575332 -19.9431645, -44.157931 -19.9431484, -44.1586408 -19.9431504, -44.1593575 -19.9431457, -44.1596498 -19.9431562, -44.1600991 -19.9431475, -44.1602331 -19.9431567, -44.1607926 -19.9432449, -44.1609723 -19.9432499, -44.1623815 -19.9432765, -44.1628299 -19.9433645, -44.1632475 -19.9435839, -44.1633456 -19.9436559, -44.1636261 -19.9439375, -44.1638186 -19.9442439, -44.1642535 -19.9451781, -44.165178 -19.947156, -44.1652928 -19.9474016, -44.1653074 -19.9474329, -44.1654026 -19.947766, -44.1654774 -19.9481718, -44.1655699 -19.9490241, -44.1656196 -19.9491538, -44.1659735 -19.9499097, -44.1662485 -19.9504925, -44.1662996 -19.9506347, -44.1663574 -19.9512961, -44.1664094 -19.9519273, -44.1664144 -19.9519881, -44.1664799 -19.9526399, -44.1666965 -19.9532586, -44.1671191 -19.9544126, -44.1672019 -19.9545869, -44.1673344 -19.9547603, -44.1675958 -19.9550466, -44.1692349 -19.9567775, -44.1694607 -19.9569284, -44.1718843 -19.9574147, -44.1719167 -19.9574206, -44.1721627 -19.9574748, -44.1723207 -19.9575386, -44.1724439 -19.9575883, -44.1742798 -19.9583293, -44.1748841 -19.9585688, -44.1751118 -19.9586796, -44.1752554 -19.9587769, -44.1752644 -19.9587881, -44.1756052 -19.9592143, -44.1766415 -19.9602689, -44.1774912 -19.9612387, -44.177663 -19.961364, -44.177856 -19.9614494, -44.178034 -19.9615125, -44.1782475 -19.9615423, -44.1785115 -19.9615155, -44.1795404 -19.9610879, -44.1796393 -19.9610759, -44.1798873 -19.9610459, -44.1802404 -19.961036, -44.1804714 -19.9609634, -44.181059 -19.9605365, -44.1815113 -19.9602333, -44.1826712 -19.9594067, -44.1829715 -19.9592551, -44.1837201 -19.9590611, -44.1839277 -19.9590073, -44.1853022 -19.9586512, -44.1856812 -19.9585316, -44.1862915 -19.9584212, -44.1866215 -19.9583494, -44.1867651 -19.9583391, -44.1868852 -19.9583372, -44.1872523 -19.9583313, -44.187823 -19.9583281, -44.1884457 -19.958351, -44.1889559 -19.958437, -44.1893825 -19.9585816, -44.1897582 -19.9587828, -44.1901186 -19.9590453, -44.1912457 -19.9602029, -44.1916575 -19.9606307, -44.1921624 -19.9611588, -44.1925367 -19.9615872, -44.1931832 -19.9622566, -44.1938468 -19.9629343, -44.194089 -19.9631996, -44.1943924 -19.9634141, -44.1946006 -19.9635104, -44.1948789 -19.963599, -44.1957402 -19.9637569, -44.1964094 -19.9638505, -44.1965875 -19.9639188, -44.1967865 -19.9640801, -44.197096 -19.9643572, -44.1972765 -19.964458, -44.1974407 -19.9644824, -44.1976234 -19.9644668, -44.1977654 -19.9644282, -44.1980715 -19.96417, -44.1984541 -19.9638069, -44.1986632 -19.9636002, -44.1988132 -19.9634172, -44.1989542 -19.9632962, -44.1991349 -19.9631081)",
                "LINESTRING (-44.1247493 -19.9467657, -44.1247979 -19.9468385, -44.1249043 -19.946934, -44.1251096 -19.9470651, -44.1252609 -19.9471383, -44.1254992 -19.947204, -44.1257652 -19.947229, -44.1261292 -19.9471833, -44.1268946 -19.9470098, -44.1276847 -19.9468416, -44.127831 -19.9468143, -44.1282639 -19.9467366, -44.1284569 -19.9467237, -44.1287119 -19.9467261, -44.1289437 -19.9467665, -44.1291499 -19.9468221, -44.1293856 -19.9469396, -44.1298857 -19.9471497, -44.1300908 -19.9472071, -44.1302743 -19.9472331, -44.1305029 -19.9472364, -44.1306498 -19.9472275, -44.1308054 -19.947216, -44.1308553 -19.9472037, -44.1313206 -19.9471394, -44.1317889 -19.9470854, -44.1330422 -19.9468887, -44.1337465 -19.9467083, -44.1339922 -19.9466842, -44.1341506 -19.9466997, -44.1343621 -19.9467226, -44.1345134 -19.9467855, -44.1346494 -19.9468456, -44.1347295 -19.946881, -44.1347988 -19.9469299, -44.1350231 -19.9471131, -44.1355843 -19.9478307, -44.1357802 -19.9480557, -44.1366289 -19.949198, -44.1370384 -19.9497001, -44.137386 -19.9501921, -44.1374113 -19.9502263, -44.1380888 -19.9510925, -44.1381769 -19.9513526, -44.1382509 -19.9516202, -44.1383014 -19.9522136, -44.1383889 -19.9530931, -44.1384227 -19.9538784, -44.1384512 -19.9539653, -44.1384555 -19.9539807, -44.1384901 -19.9541928, -44.1385563 -19.9543859, -44.1386656 -19.9545781, -44.1387339 -19.9546889, -44.1389219 -19.9548661, -44.1391695 -19.9550384, -44.1393672 -19.9551414, -44.1397538 -19.9552208, -44.1401714 -19.9552332, -44.1405656 -19.9551143, -44.1406198 -19.9550853, -44.1407579 -19.9550224, -44.1409029 -19.9549201, -44.1410283 -19.9548257, -44.1413902 -19.9544132, -44.141835 -19.9539274, -44.142268 -19.953484, -44.1427036 -19.9531023, -44.1436229 -19.952259, -44.1437568 -19.9521565, -44.1441783 -19.9517273, -44.144644 -19.9512109, -44.1452538 -19.9505663, -44.1453541 -19.9504774, -44.1458653 -19.9500442, -44.1463563 -19.9496473, -44.1467534 -19.9492812, -44.1470553 -19.9490028, -44.1475804 -19.9485293, -44.1479838 -19.9482096, -44.1485003 -19.9478532, -44.1489451 -19.9477314, -44.1492225 -19.9477024, -44.149453 -19.9476684, -44.149694 -19.9476387, -44.1499556 -19.9475436, -44.1501398 -19.9474234, -44.1502723 -19.9473206, -44.150421 -19.9471473, -44.1505043 -19.9470004, -44.1507664 -19.9462594, -44.150867 -19.9459518, -44.1509225 -19.9457843, -44.1511168 -19.945466, -44.1513601 -19.9452272, -44.1516846 -19.944999, -44.15197 -19.9448738, -44.1525994 -19.9447263, -44.1536614 -19.9444791, -44.1544071 -19.9442671, -44.1548978 -19.9441275, -44.1556247 -19.9438304, -44.1565996 -19.9434083, -44.1570351 -19.9432556, -44.1573142 -19.9432091, -44.1575332 -19.9431645, -44.157931 -19.9431484, -44.1586408 -19.9431504, -44.1593575 -19.9431457, -44.1596498 -19.9431562, -44.1600991 -19.9431475, -44.1602331 -19.9431567, -44.1607926 -19.9432449, -44.1609723 -19.9432499, -44.16176186699087 -19.94326480383335, -44.1623815 -19.9432765, -44.1628299 -19.9433645, -44.1632475 -19.9435839, -44.1633456 -19.9436559, -44.1636261 -19.9439375, -44.1638186 -19.9442439, -44.1642535 -19.9451781, -44.165178 -19.947156, -44.1652928 -19.9474016, -44.1653074 -19.9474329, -44.1654026 -19.947766, -44.1654774 -19.9481718, -44.1655699 -19.9490241, -44.1656196 -19.9491538, -44.1659735 -19.9499097, -44.1662485 -19.9504925, -44.1662996 -19.9506347, -44.1663574 -19.9512961, -44.1664094 -19.9519273, -44.1664144 -19.9519881, -44.1664799 -19.9526399, -44.1666965 -19.9532586, -44.1671191 -19.9544126, -44.1672019 -19.9545869, -44.1673344 -19.9547603, -44.1675958 -19.9550466, -44.1692349 -19.9567775, -44.1694607 -19.9569284, -44.1718843 -19.9574147, -44.1719167 -19.9574206, -44.1721627 -19.9574748, -44.1723207 -19.9575386, -44.1724439 -19.9575883, -44.1742798 -19.9583293, -44.1748841 -19.9585688, -44.1751118 -19.9586796, -44.1752554 -19.9587769, -44.1752644 -19.9587881, -44.1756052 -19.9592143, -44.1766415 -19.9602689, -44.1774912 -19.9612387, -44.177663 -19.961364, -44.177856 -19.9614494, -44.178034 -19.9615125, -44.1782475 -19.9615423, -44.1785115 -19.9615155, -44.1795404 -19.9610879, -44.1796393 -19.9610759, -44.1798873 -19.9610459, -44.1802404 -19.961036, -44.1804714 -19.9609634, -44.181059 -19.9605365, -44.1815113 -19.9602333, -44.1826712 -19.9594067, -44.1829715 -19.9592551, -44.1837201 -19.9590611, -44.1839277 -19.9590073, -44.1853022 -19.9586512, -44.1856812 -19.9585316, -44.1862915 -19.9584212, -44.1866215 -19.9583494, -44.1867651 -19.9583391, -44.1868852 -19.9583372, -44.1872523 -19.9583313, -44.187823 -19.9583281, -44.1884457 -19.958351, -44.1889559 -19.958437, -44.1893825 -19.9585816, -44.1897582 -19.9587828, -44.1901186 -19.9590453, -44.1912457 -19.9602029, -44.1916575 -19.9606307, -44.1921624 -19.9611588, -44.1925367 -19.9615872, -44.1931832 -19.9622566, -44.1938468 -19.9629343, -44.194089 -19.9631996, -44.1943924 -19.9634141, -44.1946006 -19.9635104, -44.1948789 -19.963599, -44.1957402 -19.9637569, -44.1964094 -19.9638505, -44.1965875 -19.9639188, -44.1967865 -19.9640801, -44.197096 -19.9643572, -44.1972765 -19.964458, -44.1974407 -19.9644824, -44.1976234 -19.9644668, -44.1977654 -19.9644282, -44.1980715 -19.96417, -44.1984541 -19.9638069, -44.1986632 -19.9636002, -44.1988132 -19.9634172, -44.1989542 -19.9632962, -44.1991349 -19.9631081)");
    }