shenjiayu17 commented on a change in pull request #4012:
URL:
https://github.com/apache/carbondata/pull/4012#discussion_r533974578##########
File path: geo/src/main/java/org/apache/carbondata/geo/scan/expression/PolylineListExpression.java
##########
@@ -0,0 +1,202 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *
http://www.apache.org/licenses/LICENSE-2.0+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.carbondata.geo.scan.expression;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.apache.carbondata.common.annotations.InterfaceAudience;
+import org.apache.carbondata.core.datastore.block.SegmentProperties;
+import org.apache.carbondata.core.metadata.datatype.DataTypes;
+import org.apache.carbondata.core.scan.expression.ColumnExpression;
+import org.apache.carbondata.core.scan.expression.Expression;
+import org.apache.carbondata.core.scan.expression.ExpressionResult;
+import org.apache.carbondata.core.scan.expression.UnknownExpression;
+import org.apache.carbondata.core.scan.expression.conditional.ConditionalExpression;
+import org.apache.carbondata.core.scan.filter.executer.FilterExecutor;
+import org.apache.carbondata.core.scan.filter.intf.ExpressionType;
+import org.apache.carbondata.core.scan.filter.intf.RowIntf;
+import org.apache.carbondata.core.scan.filter.resolver.FilterResolverIntf;
+import org.apache.carbondata.core.scan.filter.resolver.RowLevelFilterResolverImpl;
+import org.apache.carbondata.core.util.CustomIndex;
+import org.apache.carbondata.geo.GeoConstants;
+import org.apache.carbondata.geo.GeoHashIndex;
+import org.apache.carbondata.geo.GeoHashUtils;
+import org.apache.carbondata.geo.GeoOperationType;
+import org.apache.carbondata.geo.scan.filter.executor.PolygonFilterExecutorImpl;
+
+import org.locationtech.jts.geom.Coordinate;
+import org.locationtech.jts.geom.Geometry;
+import org.locationtech.jts.geom.GeometryFactory;
+import org.locationtech.jts.geom.LineString;
+import org.locationtech.jts.geom.Polygon;
+import org.locationtech.jts.io.WKTReader;
+import org.locationtech.jts.operation.buffer.BufferParameters;
+
+/**
+ * InPolylineList expression processor. It inputs the InPolylineList string to the Geo
+ * implementation's query method, gets a list of range of IDs from each polygon and
+ * calculates the and/or/diff range list to filter as an output. And then, build
+ * InExpression with list of all the IDs present in those list of ranges.
+ */
+@InterfaceAudience.Internal
+public class PolylineListExpression extends UnknownExpression
+ implements ConditionalExpression {
+
+ private static final GeometryFactory geoFactory = new GeometryFactory();
+
+ private String polylineString;
+
+ private Float bufferInMeter;
+
+ private GeoHashIndex instance;
+
+ private List<Long[]> ranges = new ArrayList<Long[]>();
+
+ private ColumnExpression column;
+
+ private static final ExpressionResult trueExpRes =
+ new ExpressionResult(DataTypes.BOOLEAN, true);
+
+ private static final ExpressionResult falseExpRes =
+ new ExpressionResult(DataTypes.BOOLEAN, false);
+
+ public PolylineListExpression(String polylineString, Float bufferInMeter, String columnName,
+ CustomIndex indexInstance) {
+ this.polylineString = polylineString;
+ this.bufferInMeter = bufferInMeter;
+ this.instance = (GeoHashIndex) indexInstance;
+ this.column = new ColumnExpression(columnName, DataTypes.LONG);
+ }
+
+ private void processExpression() {
+ try {
+ // transform the distance unit meter to degree
+ double buffer = bufferInMeter / GeoConstants.CONVERSION_FACTOR_OF_METER_TO_DEGREE;
+
+ // 1. parse the polyline list string and get polygon from each polyline
+ List<Geometry> polygonList = new ArrayList<>();
+ WKTReader wktReader = new WKTReader();
+ Pattern pattern = Pattern.compile(GeoConstants.POLYLINE_REG_EXPRESSION);
+ Matcher matcher = pattern.matcher(polylineString);
+ while (matcher.find()) {
+ String matchedStr = matcher.group();
+ LineString polylineCreatedFromStr = (LineString) wktReader.read(matchedStr);
+ Polygon polygonFromPolylineBuffer = (Polygon) polylineCreatedFromStr.buffer(
+ buffer, 0, BufferParameters.CAP_SQUARE);
+ polygonList.add(polygonFromPolylineBuffer);
+ }
+ // 2. get the range list of each polygon
+ if (polygonList.size() > 0) {
Review comment:
`IN_POLYLINE_LIST('LINESTRING (120.199242 30.324464, 120.190359 30.315388)', 65)`
Actually, reg expression is to match the part `LINESTRING (120.199242 30.324464, 120.190359 30.315388)` and get the string in `LINESTRING ()`, UDF can receive one or more LINESTRING in first parameter of IN_POLYLINE_LIST.
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