rdblue commented on code in PR #5513: URL: https://github.com/apache/iceberg/pull/5513#discussion_r945205282
########## spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/functions/BucketFunction.java: ########## @@ -0,0 +1,303 @@ +/* + * 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.iceberg.spark.functions; + +import java.nio.ByteBuffer; +import java.util.Set; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableSet; +import org.apache.iceberg.util.BucketUtil; +import org.apache.spark.sql.catalyst.InternalRow; +import org.apache.spark.sql.connector.catalog.functions.BoundFunction; +import org.apache.spark.sql.connector.catalog.functions.ScalarFunction; +import org.apache.spark.sql.connector.catalog.functions.UnboundFunction; +import org.apache.spark.sql.types.BinaryType; +import org.apache.spark.sql.types.ByteType; +import org.apache.spark.sql.types.DataType; +import org.apache.spark.sql.types.DataTypes; +import org.apache.spark.sql.types.DateType; +import org.apache.spark.sql.types.Decimal; +import org.apache.spark.sql.types.DecimalType; +import org.apache.spark.sql.types.IntegerType; +import org.apache.spark.sql.types.LongType; +import org.apache.spark.sql.types.ShortType; +import org.apache.spark.sql.types.StringType; +import org.apache.spark.sql.types.StructField; +import org.apache.spark.sql.types.StructType; +import org.apache.spark.sql.types.TimestampType; +import org.apache.spark.unsafe.types.UTF8String; + +/** + * A Spark function implementation for the Iceberg bucket transform. + * + * <p>Example usage: {@code SELECT system.bucket(128, 'abc')}, which returns the bucket 122. + * + * <p>Note that for performance reasons, the given input number of buckets is not validated in the + * implementations used in code-gen. The number of buckets must be positive to give meaningful + * results. + */ +public class BucketFunction implements UnboundFunction { + private static final int NUM_BUCKETS_ORDINAL = 0; + private static final int VALUE_ORDINAL = 1; + private static final Set<DataType> SUPPORTED_NUM_BUCKETS_TYPES = + ImmutableSet.of(DataTypes.ByteType, DataTypes.ShortType, DataTypes.IntegerType); + + @Override + public BoundFunction bind(StructType inputType) { + if (inputType.size() != 2) { + throw new UnsupportedOperationException( + "Wrong number of inputs (expected numBuckets and value)"); + } + + StructField numBucketsField = inputType.fields()[NUM_BUCKETS_ORDINAL]; + StructField valueField = inputType.fields()[VALUE_ORDINAL]; + + if (!SUPPORTED_NUM_BUCKETS_TYPES.contains(numBucketsField.dataType())) { + throw new UnsupportedOperationException( + "Expected number of buckets to be tinyint, shortint or int"); + } + + // TODO - Support UUID type. Review Comment: There is no UUID type in Spark, so I don't think there is a way to expose this. You can probably remove the TODO. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
