kumarvishal09 commented on a change in pull request #3193: [CARBONDATA-3365] Integrate apache arrow vector filling to carbon SDK
URL:
https://github.com/apache/carbondata/pull/3193#discussion_r285079896
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File path: store/sdk/src/main/java/org/apache/carbondata/sdk/file/arrow/ArrowConverter.java
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@@ -0,0 +1,136 @@
+/*
+ * 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.sdk.file.arrow;
+
+import java.io.IOException;
+import java.nio.channels.Channels;
+import java.util.TimeZone;
+
+import org.apache.carbondata.sdk.file.Schema;
+
+import org.apache.arrow.memory.BufferAllocator;
+import org.apache.arrow.vector.VectorLoader;
+import org.apache.arrow.vector.VectorSchemaRoot;
+import org.apache.arrow.vector.VectorUnloader;
+import org.apache.arrow.vector.ipc.ArrowFileReader;
+import org.apache.arrow.vector.ipc.ArrowFileWriter;
+import org.apache.arrow.vector.util.ByteArrayReadableSeekableByteChannel;
+
+public class ArrowConverter {
+
+ private final BufferAllocator allocator;
+ private VectorSchemaRoot root;
+ private ArrowWriter arrowWriter;
+ private org.apache.arrow.vector.types.pojo.Schema arrowSchema;
+ private ExtendedByteArrayOutputStream out;
+ private ArrowFileWriter writer;
+
+ public ArrowConverter(Schema schema, int initialSize) {
+ this.arrowSchema = ArrowUtils.toArrowSchema(schema, TimeZone.getDefault().getID());
+ this.allocator =
+ ArrowUtils.rootAllocator.newChildAllocator("toArrowBuffer", initialSize, Long.MAX_VALUE);
+ this.root = VectorSchemaRoot.create(arrowSchema, allocator);
+ this.arrowWriter = ArrowWriter.create(root);
+ // currently blocklet level read and set initial value to 32 MB.
+ this.out = new ExtendedByteArrayOutputStream(32 * 1024 * 1024);
+ this.writer = new ArrowFileWriter(root, null, Channels.newChannel(out));
+ }
+
+ /**
+ * write batch of row objects to Arrow vectors
+ *
+ * @param data
+ */
+ public void addToArrowBuffer(Object[] data) {
+ int i = 0;
+ while (i < data.length) {
+ arrowWriter.write((Object[]) data[i]);
+ i += 1;
+ }
+ }
+
+ /**
+ * To serialize arrow vectors to byte[]
+ *
+ * @return
+ * @throws IOException
+ */
+ public byte[] toSerializeArray() throws IOException {
+ arrowWriter.finish();
+ writer.writeBatch();
+ this.writer.close();
+ arrowWriter.reset();
+ writer.close();
+ this.root.close();
+ final byte[] bytes = out.toByteArray();
Review comment:
directly return the byte array no need to create any variable
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