Adds ST_SIMPLIFY geo spatial function

docs/changelog/136309.yaml

@@ -0,0 +1,5 @@
+pr: 136309
+summary: Adds ST_SIMPLIFY geo spatial function
+area: ES|QL
+type: enhancement
+issues: []

x-pack/plugin/esql-core/build.gradle

@@ -16,6 +16,7 @@ base {
 dependencies {
   api "org.antlr:antlr4-runtime:${versions.antlr4}"
   api project(path: xpackModule('mapper-version'))
+  api "org.locationtech.jts:jts-core:${versions.jts}"
   compileOnly project(path: xpackModule('core'))
   testApi(project(xpackModule('esql-core:test-fixtures'))) {
     exclude group: 'org.elasticsearch.plugin', module: 'esql-core'

x-pack/plugin/esql-core/licenses/jts-core-LICENSE.txt

@@ -0,0 +1,31 @@
+Eclipse Distribution License - v 1.0
+
+Copyright (c) 2007, Eclipse Foundation, Inc. and its licensors.
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+  Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+  Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+  Neither the name of the Eclipse Foundation, Inc. nor the names of its
+  contributors may be used to endorse or promote products derived from this
+  software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+

x-pack/plugin/esql-core/licenses/jts-core-NOTICE.txt

@@ -0,0 +1 @@
+

x-pack/plugin/esql-core/src/main/java/org/elasticsearch/xpack/esql/core/util/SpatialCoordinateTypes.java

@@ -16,6 +16,9 @@
 import org.elasticsearch.geometry.utils.GeometryValidator;
 import org.elasticsearch.geometry.utils.WellKnownBinary;
 import org.elasticsearch.geometry.utils.WellKnownText;
+import org.locationtech.jts.io.ParseException;
+import org.locationtech.jts.io.WKTReader;
+import org.locationtech.jts.io.WKTWriter;
 
 import java.nio.ByteOrder;
 
@@ -125,4 +128,17 @@ public String wkbToWkt(BytesRef wkb) {
     public Geometry wkbToGeometry(BytesRef wkb) {
         return WellKnownBinary.fromWKB(validator(), false, wkb.bytes, wkb.offset, wkb.length);
     }
+
+    public org.locationtech.jts.geom.Geometry wkbToJtsGeometry(BytesRef wkb) throws ParseException {
+        String wkt = wkbToWkt(wkb);
+        WKTReader reader = new WKTReader();
+        return reader.read(wkt);
+    }
+
+    public BytesRef jtsGeometryToWkb(org.locationtech.jts.geom.Geometry jtsGeometry) {
+        WKTWriter writer = new WKTWriter();
+        String wkt = writer.write(jtsGeometry);
+        return wktToWkb(wkt);
+    }
+
 }

x-pack/plugin/esql/qa/testFixtures/src/main/resources/spatial.csv-spec

@@ -3024,3 +3024,123 @@ wkt:keyword                |pt:cartesian_point
 "POINT(111)"               |null
 // end::to_cartesianpoint-str-parse-error-result[]
 ;
+
+###############################################
+# Tests for ST_SIMPLIFY
+###############################################
+
+stSimplifyMultiRow
+required_capability: st_simplify
+
+FROM airports
+| SORT name
+| LIMIT 5
+| EVAL result = st_simplify(TO_GEOSHAPE("POLYGON((-10 -60, 120 -60, 120 60, -10 60, -10 -60))"), 1.0)
+| KEEP name, result
+;
+
+name:text                | result:geo_shape
+Aba Tenna D. Yilma Int'l | POLYGON ((-10.0 -60.0, -10.0 60.0, 120.0 60.0, 120.0 -60.0, -10.0 -60.0))
+Abdul Rachman Saleh      | POLYGON ((-10.0 -60.0, -10.0 60.0, 120.0 60.0, 120.0 -60.0, -10.0 -60.0))
+Abidjan Port Bouet       | POLYGON ((-10.0 -60.0, -10.0 60.0, 120.0 60.0, 120.0 -60.0, -10.0 -60.0))
+Abu Dhabi Int'l          | POLYGON ((-10.0 -60.0, -10.0 60.0, 120.0 60.0, 120.0 -60.0, -10.0 -60.0))
+Abuja Int'l              | POLYGON ((-10.0 -60.0, -10.0 60.0, 120.0 60.0, 120.0 -60.0, -10.0 -60.0))
+;
+
+stSimplifyMultiRowWithPoints
+required_capability: st_simplify
+
+FROM airports
+| SORT name
+| LIMIT 5
+| EVAL result = st_simplify(location, 0.0)
+| KEEP location, result
+;
+
+location:geo_point                         | result:geo_shape
+POINT (41.857756722253 9.61267784753569)   | POINT (41.857756722253 9.61267784753569)
+POINT (112.711418617258 -7.92998002840567) | POINT (112.711418617258 -7.92998002840567)
+POINT (-3.93221929167636 5.2543984451492)  | POINT (-3.93221929167636 5.2543984451492)
+POINT (54.6463293225558 24.4272271529764)  | POINT (54.6463293225558 24.4272271529764)
+POINT (7.27025993974356 9.00437659781094)  | POINT (7.27025993974356 9.00437659781094)
+;
+
+stSimplifyNoSimplification
+required_capability: st_simplify
+
+ROW geo_shape = TO_GEOSHAPE("POLYGON((0 0, 1 0.1, 2 0, 2 2, 1 1.9, 0 2, 0 0))") 
+| EVAL result = st_simplify(geo_shape, 0.01)
+| KEEP result
+;
+
+result:geo_shape
+POLYGON ((0.0 0.0, 0.0 2.0, 1.0 1.9, 2.0 2.0, 2.0 0.0, 1.0 0.1, 0.0 0.0))
+;
+
+stSimplifyWithSimplification
+required_capability: st_simplify
+
+ROW geo_shape = TO_GEOSHAPE("POLYGON((0 0, 1 0.1, 2 0, 2 2, 1 1.9, 0 2, 0 0))") 
+| EVAL result = st_simplify(geo_shape, 0.2)
+| KEEP result
+;
+
+result:geo_shape
+POLYGON ((0.0 0.0, 0.0 2.0, 2.0 2.0, 2.0 0.0, 0.0 0.0))
+;
+
+stSimplifyEmptySimplification
+required_capability: st_simplify
+
+ROW geo_shape = TO_GEOSHAPE("POLYGON((0 0, 1 0.1, 2 0, 2 2, 1 1.9, 0 2, 0 0))") 
+| EVAL result = st_simplify(geo_shape, 2.0)
+| KEEP result
+;
+
+result:geo_shape
+POLYGON EMPTY
+;
+
+stSimplifyNull
+required_capability: st_simplify
+
+ROW geo_shape = NULL
+| EVAL result = st_simplify(geo_shape, 2.0)
+| KEEP result
+;
+
+result:geo_shape
+NULL
+;
+
+stSimplifyCartesianPoint
+required_capability: st_simplify
+
+# TODO Why cannot we use a latitud outside of -90, 90 when there are tests
+# that use the TO_CARTESIANPOINT that are doing it already?
+ROW wkt = ["POINT(97.11 75.53)", "POINT(80.93 72.77)"]
+| MV_EXPAND wkt
+| EVAL pt = TO_CARTESIANPOINT(wkt)
+| EVAL result = st_simplify(pt, 2.0)
+| KEEP result
+;
+
+result:geo_shape
+POINT (97.11 75.53)
+POINT (80.93 72.77)
+;
+
+stSimplifyCartesianShape
+required_capability: st_simplify
+
+ROW wkt = ["POINT(97.11 75.53)", "POLYGON((0 0, 1 0.1, 2 0, 2 2, 1 1.9, 0 2, 0 0))"]
+| MV_EXPAND wkt
+| EVAL geom = TO_CARTESIANSHAPE(wkt)
+| EVAL result = st_simplify(geom, 0.2)
+| KEEP result
+;
+
+result:geo_shape
+POINT (97.11 75.53)
+POLYGON ((0.0 0.0, 0.0 2.0, 2.0 2.0, 2.0 0.0, 0.0 0.0))
+;