kbendick commented on code in PR #5305: URL: https://github.com/apache/iceberg/pull/5305#discussion_r927015283
########## spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/functions/TruncateFunction.java: ########## @@ -0,0 +1,319 @@ +/* + * 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.math.BigDecimal; +import java.math.BigInteger; +import java.nio.ByteBuffer; +import java.nio.CharBuffer; +import java.nio.charset.StandardCharsets; +import org.apache.iceberg.spark.SparkSchemaUtil; +import org.apache.iceberg.types.Type; +import org.apache.iceberg.util.ByteBuffers; +import org.apache.iceberg.util.UnicodeUtil; +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.DataType; +import org.apache.spark.sql.types.DataTypes; +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.StructField; +import org.apache.spark.sql.types.StructType; +import org.apache.spark.unsafe.types.UTF8String; + +/** + * Implementation of {@link UnboundFunction} that matches the {@code truncate} transformation. + * The various implementations are registered with the {@link org.apache.iceberg.spark.SparkCatalog} + * such that the function can be used as {@code truncate(col, width)} or {@code truncate(col, 2)}. + */ +public class TruncateFunction implements UnboundFunction { + + public TruncateFunction() { + + } + + private static void validateSourceTypeUsingSparkTypes(DataType dt) { + if (!DataTypes.IntegerType.acceptsType(dt) && !DataTypes.LongType.acceptsType(dt) && + !DataTypes.StringType.acceptsType(dt) && !DataTypes.BinaryType.acceptsType(dt) && + !(dt instanceof DecimalType)) { + throw new UnsupportedOperationException( + "Cannot truncate input type. Expected one of [IntegerType, LongType, DecimalType, StringType, BinaryType], " + + "but found " + dt.catalogString()); + } + } + + private static void validateTruncationWidthType(DataType widthType) { + if (!(widthType instanceof IntegerType || + !(widthType instanceof LongType && DataTypes.IntegerType.acceptsType(widthType)))) { + throw new UnsupportedOperationException("Expected truncation width to be an integer type"); + } + } + + @Override + public BoundFunction bind(StructType inputType) { + if (inputType.fields().length != 2) { + throw new UnsupportedOperationException( + String.format("Invalid input type. Expected 2 fields but found %s", inputType.fields().length)); + } + + StructField fieldToTruncate = inputType.apply(0); + StructField truncationWidth = inputType.apply(1); + + DataType toTruncateSparkType = fieldToTruncate.dataType(); + Type sourceIcebergType = SparkSchemaUtil.convert(fieldToTruncate.dataType()); + + validateSourceTypeUsingSparkTypes(fieldToTruncate.dataType()); + validateTruncationWidthType(truncationWidth.dataType()); + + switch (sourceIcebergType.typeId()) { + case INTEGER: + return new TruncateInteger(); + case LONG: + return new TruncateLong(); + case DECIMAL: + return new TruncateDecimal( + ((DecimalType) toTruncateSparkType).precision(), + ((DecimalType) toTruncateSparkType).scale()); + case STRING: + return new TruncateString(); + case BINARY: + return new TruncateBinary(); + default: + throw new UnsupportedOperationException( + "Cannot truncate type: " + sourceIcebergType.typeId()); + } + } + + @Override + public String description() { + return "Truncate - The Iceberg truncate function used for truncate partition transformations."; + } + + @Override + public String name() { + return "truncate"; + } + + public abstract static class TruncateBase<T> implements ScalarFunction<T> { + @Override + public String name() { + return "truncate"; + } + + @Override + public boolean isResultNullable() { + return true; + } + + @Override + public boolean isDeterministic() { + return true; Review Comment: Removed the unnecessary overrides. -- This is an automated message from the Apache Git Service. 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