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Add Delta Lake source to the Java Managed API #38902
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142 changes: 142 additions & 0 deletions
142
...io/delta/src/main/java/org/apache/beam/sdk/io/delta/DeltaReadSchemaTransformProvider.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| /* | ||
| * 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.beam.sdk.io.delta; | ||
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| import static org.apache.beam.sdk.io.delta.DeltaReadSchemaTransformProvider.Configuration; | ||
| import static org.apache.beam.sdk.util.construction.BeamUrns.getUrn; | ||
|
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| import com.google.auto.service.AutoService; | ||
| import com.google.auto.value.AutoValue; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import org.apache.beam.model.pipeline.v1.ExternalTransforms; | ||
| import org.apache.beam.sdk.io.delta.DeltaReadSchemaTransformProvider.Configuration; | ||
| import org.apache.beam.sdk.schemas.AutoValueSchema; | ||
| import org.apache.beam.sdk.schemas.NoSuchSchemaException; | ||
| import org.apache.beam.sdk.schemas.SchemaRegistry; | ||
| import org.apache.beam.sdk.schemas.annotations.DefaultSchema; | ||
| import org.apache.beam.sdk.schemas.annotations.SchemaFieldDescription; | ||
| import org.apache.beam.sdk.schemas.transforms.SchemaTransform; | ||
| import org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider; | ||
| import org.apache.beam.sdk.schemas.transforms.TypedSchemaTransformProvider; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
| import org.apache.beam.sdk.values.PCollectionRowTuple; | ||
| import org.apache.beam.sdk.values.Row; | ||
| import org.checkerframework.checker.nullness.qual.Nullable; | ||
|
|
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| /** | ||
| * SchemaTransform implementation for {@link DeltaIO#readRows}. Reads records from Delta Lake and | ||
| * outputs a {@link org.apache.beam.sdk.values.PCollection} of Beam {@link | ||
| * org.apache.beam.sdk.values.Row}s. | ||
| */ | ||
| @AutoService(SchemaTransformProvider.class) | ||
| public class DeltaReadSchemaTransformProvider extends TypedSchemaTransformProvider<Configuration> { | ||
| static final String OUTPUT_TAG = "output"; | ||
|
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| @Override | ||
| protected SchemaTransform from(Configuration configuration) { | ||
| return new DeltaReadSchemaTransform(configuration); | ||
| } | ||
|
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| @Override | ||
| public List<String> outputCollectionNames() { | ||
| return Collections.singletonList(OUTPUT_TAG); | ||
| } | ||
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| @Override | ||
| public String identifier() { | ||
| return getUrn(ExternalTransforms.ManagedTransforms.Urns.DELTA_LAKE_READ); | ||
| } | ||
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| static class DeltaReadSchemaTransform extends SchemaTransform { | ||
| private final Configuration configuration; | ||
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| DeltaReadSchemaTransform(Configuration configuration) { | ||
| this.configuration = | ||
| java.util.Objects.requireNonNull(configuration, "configuration cannot be null"); | ||
| } | ||
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| Row getConfigurationRow() { | ||
| try { | ||
| return SchemaRegistry.createDefault() | ||
| .getToRowFunction(Configuration.class) | ||
| .apply(configuration) | ||
| .sorted() | ||
| .toSnakeCase(); | ||
| } catch (NoSuchSchemaException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public PCollectionRowTuple expand(PCollectionRowTuple input) { | ||
| DeltaIO.ReadRows read = DeltaIO.readRows().from(configuration.getTable()); | ||
| if (configuration.getVersion() != null) { | ||
| read = read.withVersion(configuration.getVersion()); | ||
| } | ||
| if (configuration.getTimestamp() != null) { | ||
| read = read.withTimestamp(configuration.getTimestamp()); | ||
| } | ||
| Map<String, String> hadoopConfig = configuration.getHadoopConfig(); | ||
| if (hadoopConfig != null) { | ||
| read = read.withConfig(hadoopConfig); | ||
| } | ||
|
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| PCollection<Row> output = input.getPipeline().apply(read); | ||
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| return PCollectionRowTuple.of(OUTPUT_TAG, output); | ||
| } | ||
| } | ||
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| @DefaultSchema(AutoValueSchema.class) | ||
| @AutoValue | ||
| public abstract static class Configuration { | ||
| static Builder builder() { | ||
| return new AutoValue_DeltaReadSchemaTransformProvider_Configuration.Builder(); | ||
| } | ||
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| @SchemaFieldDescription("Identifier of the Delta Lake table.") | ||
| abstract String getTable(); | ||
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| @SchemaFieldDescription("Version of the Delta Lake table to read.") | ||
| @Nullable | ||
| abstract Long getVersion(); | ||
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| @SchemaFieldDescription("Timestamp of the Delta Lake table to read.") | ||
| @Nullable | ||
| abstract String getTimestamp(); | ||
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| @SchemaFieldDescription("Properties passed to the Hadoop Configuration.") | ||
| @Nullable | ||
| abstract Map<String, String> getHadoopConfig(); | ||
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| @AutoValue.Builder | ||
| abstract static class Builder { | ||
| abstract Builder setTable(String table); | ||
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| abstract Builder setVersion(@Nullable Long version); | ||
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| abstract Builder setTimestamp(@Nullable String timestamp); | ||
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| abstract Builder setHadoopConfig(@Nullable Map<String, String> hadoopConfig); | ||
|
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| abstract Configuration build(); | ||
| } | ||
| } | ||
| } | ||
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