VenuReddy2103 commented on a change in pull request #3436: [CARBONDATA-3548]Geospatial Support: Modified to create and load the table with a nonschema dimension sort column. And added InPolygon UDF
URL:
https://github.com/apache/carbondata/pull/3436#discussion_r354736160
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File path: core/src/main/java/org/apache/carbondata/core/util/CustomIndex.java
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@@ -0,0 +1,87 @@
+/*
+ * 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.core.util;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.Base64;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Abstract class for custom index handler
+ * @param <ReturnType>
+ */
+public abstract class CustomIndex<ReturnType> implements Serializable {
+ /**
+ * Initialize the custom index handler instance.
+ * @param handlerName
+ * @param properties
+ * @throws Exception
+ */
+ public abstract void init(String handlerName, Map<String, String> properties) throws Exception;
+
+ /**
+ * Generates the custom index column value from the given source columns.
+ * @param columns
+ * @return Returns generated column value
+ * @throws Exception
+ */
+ public abstract String generate(List<?> columns) throws Exception;
+
+ /**
+ * Query processor for custom index handler.
+ * @param query
+ * @return Returns list of ranges to be fetched
+ * @throws Exception
+ */
+ public abstract ReturnType query(String query) throws Exception;
+
+ /**
+ * Deserializes and returns the custom handler instance
+ * @param serializedInstance
+ * @return
+ * @throws IOException
+ * @throws ClassNotFoundException
+ */
+ public static CustomIndex getCustomInstance(String serializedInstance)
Review comment:
It is a carbon existing serialization/deserialization with `Base64` encode/decode(`ObjectSerializationUtil.convertObjectToString`/`ObjectSerializationUtil.convertStringToObject`). Concrete classes can override `writeObject()` and `readObject()` to have their custom fields to be serialized/deserialized. We will have better control even if user has their own implementation of geohash.
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