feat(avro): expose Avro reader via registerAvro and readAvro (#60) · coderfender/datafusion-java@fe4414a · GitHub
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feat(avro): expose Avro reader via registerAvro and readAvro (apache#60)
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‎core/pom.xml‎

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‎core/src/main/java/org/apache/datafusion/AvroReadOptions.java‎

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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.apache.datafusion;
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import org.apache.arrow.vector.types.pojo.Schema;
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import org.apache.datafusion.protobuf.AvroReadOptionsProto;
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/**
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* Configuration knobs for Avro sources passed to {@link SessionContext#registerAvro(String, String,
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* AvroReadOptions)} and {@link SessionContext#readAvro(String, AvroReadOptions)}.
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*
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* <p>Mirrors the subset of DataFusion's {@code AvroReadOptions} that maps onto the Java surface
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* today: {@code fileExtension} (default {@code ".avro"}) and an explicit Arrow {@code schema} that
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* bypasses on-read schema inference. {@code tablePartitionCols} is intentionally deferred -- no
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* other Java reader exposes Hive-style partitioning yet.
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*
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* <p>Avro carries its own per-block compression (snappy, deflate, bzip2, xz, zstandard) inside the
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* object container itself, negotiated when the file is written, so unlike CSV / NDJSON there is no
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* {@code FileCompressionType} setter.
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*/
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public final class AvroReadOptions {
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private String fileExtension = ".avro";
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private Schema schema;
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public AvroReadOptions fileExtension(String ext) {
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this.fileExtension = ext;
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return this;
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}
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public AvroReadOptions schema(Schema schema) {
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this.schema = schema;
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return this;
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}
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byte[] toBytes() {
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return AvroReadOptionsProto.newBuilder().setFileExtension(fileExtension).build().toByteArray();
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}
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Schema schema() {
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return schema;
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}
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}

‎core/src/main/java/org/apache/datafusion/SessionContext.java‎

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@@ -362,6 +362,70 @@ public DataFrame readArrow(String path, ArrowReadOptions options) {
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return new DataFrame(dfHandle);
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}
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/** Register an Avro file (or directory of Avro files) as a table. */
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public void registerAvro(String name, String path) {
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registerAvro(name, path, new AvroReadOptions());
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}
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/**
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* Register an Avro file (or directory of Avro files) as a table with the supplied {@link
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* AvroReadOptions}.
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*
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* @throws IllegalArgumentException if any of {@code name}, {@code path}, or {@code options} is
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* {@code null}.
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* @throws RuntimeException if registration fails (path not found, schema mismatch, etc.).
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*/
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public void registerAvro(String name, String path, AvroReadOptions options) {
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if (nativeHandle == 0) {
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throw new IllegalStateException("SessionContext is closed");
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}
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if (name == null) {
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throw new IllegalArgumentException("registerAvro name must be non-null");
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}
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if (path == null) {
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throw new IllegalArgumentException("registerAvro path must be non-null");
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}
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if (options == null) {
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throw new IllegalArgumentException("registerAvro options must be non-null");
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}
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registerAvroWithOptions(
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nativeHandle,
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name,
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path,
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options.toBytes(),
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options.schema() != null ? serializeSchemaIpc(options.schema()) : null);
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}
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/** Read an Avro file as a {@link DataFrame} without registering it. */
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public DataFrame readAvro(String path) {
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return readAvro(path, new AvroReadOptions());
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}
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/**
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* Read an Avro file as a {@link DataFrame} with the supplied {@link AvroReadOptions}.
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*
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* @throws IllegalArgumentException if {@code path} or {@code options} is {@code null}.
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* @throws RuntimeException if the read fails.
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*/
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public DataFrame readAvro(String path, AvroReadOptions options) {
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if (nativeHandle == 0) {
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throw new IllegalStateException("SessionContext is closed");
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}
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if (path == null) {
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throw new IllegalArgumentException("readAvro path must be non-null");
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}
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if (options == null) {
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throw new IllegalArgumentException("readAvro options must be non-null");
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}
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long dfHandle =
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readAvroWithOptions(
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nativeHandle,
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path,
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options.toBytes(),
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options.schema() != null ? serializeSchemaIpc(options.schema()) : null);
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return new DataFrame(dfHandle);
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}
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/**
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* Register a Java-implemented scalar UDF. After registration, the function can be invoked by SQL
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* via the UDF's name or referenced in DataFusion plans deserialised with {@link #fromProto}.
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private static native long readArrowWithOptions(
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long handle, String path, byte[] optionsBytes, byte[] schemaIpcBytes);
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private static native void registerAvroWithOptions(
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long handle, String name, String path, byte[] optionsBytes, byte[] schemaIpcBytes);
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private static native long readAvroWithOptions(
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long handle, String path, byte[] optionsBytes, byte[] schemaIpcBytes);
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private static native void registerJsonWithOptions(
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long handle, String name, String path, byte[] optionsBytes, byte[] schemaIpcBytes);
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‎core/src/test/java/org/apache/datafusion/AvroReadOptionsTest.java‎

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