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)` In fact, reg expression is the part `LINESTRING (120.199242 30.324464, 120.190359 30.315388)`, UDF can receive one or more LINESTRING in first input parameter. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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