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VenuReddy2103 commented on a change in pull request #4012:
URL:
https://github.com/apache/carbondata/pull/4012#discussion_r532569787##########
File path: geo/src/main/java/org/apache/carbondata/geo/scan/expression/PolygonListExpression.java
##########
@@ -0,0 +1,174 @@
+/*
+ * 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.scan.filter.executor.PolygonFilterExecutorImpl;
+
+/**
+ * InPolygonList expression processor. It inputs the InPolygonList 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 PolygonListExpression extends UnknownExpression implements ConditionalExpression {
+
+ private String polygonListString;
+
+ private String opType;
+
+ 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 PolygonListExpression(String polygonListString, String opType, String columnName,
+ CustomIndex indexInstance) {
+ this.polygonListString = polygonListString;
+ this.opType = opType;
+ this.instance = (GeoHashIndex)indexInstance;
+ this.column = new ColumnExpression(columnName, DataTypes.LONG);
+ }
+
+ private void processExpression() {
+ try {
+ // 1. parse the polygon list string
+ List<String> polygons = new ArrayList<>();
+ Pattern pattern = Pattern.compile(GeoConstants.POLYGON_REG_EXPRESSION);
+ Matcher matcher = pattern.matcher(polygonListString);
+ while (matcher.find()) {
+ String matchedStr = matcher.group();
+ polygons.add(matchedStr);
+ }
+ if (polygons.size() < 2) {
+ throw new RuntimeException("polygon list need at least 2 polygons, really has " +
+ polygons.size());
+ }
+ // 2. get the range list of each polygon
+ List<Long[]> processedRangeList = instance.query(polygons.get(0));
+ for (int i = 1; i < polygons.size(); i++) {
+ List<Long[]> tempRangeList = instance.query(polygons.get(i));
+ processedRangeList = GeoHashUtils.processRangeList(
+ processedRangeList, tempRangeList, opType);
+ }
+ ranges = processedRangeList;
+ GeoHashUtils.validateRangeList(ranges);
Review comment:
Intention of validateRangeList() to check if each element of List<Long[]> is only array of 2 elements(i.e., has only min and max value of range) was because `instance` class can be implemented by any user class adhering to `CustomIndex` interface. To make sure, `query()` returns list of array of only 2 elements, have this validation.
I think, we need to call `validateRangeList()` right after each call to `instance.query()`. Not required at the end after merge.
check for other places too in this PR.
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