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[HUDI-3981] Flink engine support for comprehensive schema evolution (a…
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hudi-flink-datasource/hudi-flink/src/main/java/org/apache/hudi/table/format/CastMap.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.hudi.table.format; | ||
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| import org.apache.hudi.common.util.Option; | ||
| import org.apache.hudi.util.RowDataCastProjection; | ||
| import org.apache.hudi.util.RowDataProjection; | ||
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| import org.apache.flink.annotation.VisibleForTesting; | ||
| import org.apache.flink.table.data.DecimalData; | ||
| import org.apache.flink.table.data.binary.BinaryStringData; | ||
| import org.apache.flink.table.types.DataType; | ||
| import org.apache.flink.table.types.logical.DecimalType; | ||
| import org.apache.flink.table.types.logical.LogicalType; | ||
| import org.apache.flink.table.types.logical.LogicalTypeRoot; | ||
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| import javax.annotation.Nullable; | ||
| import java.io.Serializable; | ||
| import java.math.BigDecimal; | ||
| import java.time.LocalDate; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.function.Function; | ||
| import java.util.stream.Collectors; | ||
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| import static org.apache.flink.table.types.logical.LogicalTypeRoot.BIGINT; | ||
| import static org.apache.flink.table.types.logical.LogicalTypeRoot.DATE; | ||
| import static org.apache.flink.table.types.logical.LogicalTypeRoot.DECIMAL; | ||
| import static org.apache.flink.table.types.logical.LogicalTypeRoot.DOUBLE; | ||
| import static org.apache.flink.table.types.logical.LogicalTypeRoot.FLOAT; | ||
| import static org.apache.flink.table.types.logical.LogicalTypeRoot.INTEGER; | ||
| import static org.apache.flink.table.types.logical.LogicalTypeRoot.VARCHAR; | ||
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| /** | ||
| * CastMap is responsible for conversion of flink types when full schema evolution enabled. | ||
| * Supported cast conversions: | ||
| * Integer => Long, Float, Double, Decimal, String | ||
| * Long => Float, Double, Decimal, String | ||
| * Float => Double, Decimal, String | ||
| * Double => Decimal, String | ||
| * Decimal => Decimal, String | ||
| * String => Decimal, Date | ||
| * Date => String | ||
| */ | ||
| public final class CastMap implements Serializable { | ||
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| private static final long serialVersionUID = 1L; | ||
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| // Maps position to corresponding cast | ||
| private final Map<Integer, Cast> castMap = new HashMap<>(); | ||
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| private DataType[] fileFieldTypes; | ||
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| public Option<RowDataProjection> toRowDataProjection(int[] selectedFields) { | ||
| if (castMap.isEmpty()) { | ||
| return Option.empty(); | ||
| } | ||
| LogicalType[] requiredType = new LogicalType[selectedFields.length]; | ||
| for (int i = 0; i < selectedFields.length; i++) { | ||
| requiredType[i] = fileFieldTypes[selectedFields[i]].getLogicalType(); | ||
| } | ||
| return Option.of(new RowDataCastProjection(requiredType, this)); | ||
| } | ||
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| public Object castIfNeeded(int pos, Object val) { | ||
| Cast cast = castMap.get(pos); | ||
| if (cast == null) { | ||
| return val; | ||
| } | ||
| return cast.convert(val); | ||
| } | ||
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| public DataType[] getFileFieldTypes() { | ||
| return fileFieldTypes; | ||
| } | ||
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| public void setFileFieldTypes(DataType[] fileFieldTypes) { | ||
| this.fileFieldTypes = fileFieldTypes; | ||
| } | ||
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| @VisibleForTesting | ||
| void add(int pos, LogicalType fromType, LogicalType toType) { | ||
| Function<Object, Object> conversion = getConversion(fromType, toType); | ||
| if (conversion == null) { | ||
| throw new IllegalArgumentException(String.format("Cannot create cast %s => %s at pos %s", fromType, toType, pos)); | ||
| } | ||
| add(pos, new Cast(fromType, toType, conversion)); | ||
| } | ||
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| private @Nullable Function<Object, Object> getConversion(LogicalType fromType, LogicalType toType) { | ||
| LogicalTypeRoot from = fromType.getTypeRoot(); | ||
| LogicalTypeRoot to = toType.getTypeRoot(); | ||
| switch (to) { | ||
| case BIGINT: { | ||
| if (from == INTEGER) { | ||
| return val -> ((Number) val).longValue(); | ||
| } | ||
| break; | ||
| } | ||
| case FLOAT: { | ||
| if (from == INTEGER || from == BIGINT) { | ||
| return val -> ((Number) val).floatValue(); | ||
| } | ||
| break; | ||
| } | ||
| case DOUBLE: { | ||
| if (from == INTEGER || from == BIGINT) { | ||
| return val -> ((Number) val).doubleValue(); | ||
| } | ||
| if (from == FLOAT) { | ||
| return val -> Double.parseDouble(val.toString()); | ||
| } | ||
| break; | ||
| } | ||
| case DECIMAL: { | ||
| if (from == INTEGER || from == BIGINT || from == DOUBLE) { | ||
| return val -> toDecimalData((Number) val, toType); | ||
| } | ||
| if (from == FLOAT) { | ||
| return val -> toDecimalData(Double.parseDouble(val.toString()), toType); | ||
| } | ||
| if (from == VARCHAR) { | ||
| return val -> toDecimalData(Double.parseDouble(val.toString()), toType); | ||
| } | ||
| if (from == DECIMAL) { | ||
| return val -> toDecimalData(((DecimalData) val).toBigDecimal(), toType); | ||
| } | ||
| break; | ||
| } | ||
| case VARCHAR: { | ||
| if (from == INTEGER | ||
| || from == BIGINT | ||
| || from == FLOAT | ||
| || from == DOUBLE | ||
| || from == DECIMAL) { | ||
| return val -> new BinaryStringData(String.valueOf(val)); | ||
| } | ||
| if (from == DATE) { | ||
| return val -> new BinaryStringData(LocalDate.ofEpochDay(((Integer) val).longValue()).toString()); | ||
| } | ||
| break; | ||
| } | ||
| case DATE: { | ||
| if (from == VARCHAR) { | ||
| return val -> (int) LocalDate.parse(val.toString()).toEpochDay(); | ||
| } | ||
| break; | ||
| } | ||
| default: | ||
| } | ||
| return null; | ||
| } | ||
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| private void add(int pos, Cast cast) { | ||
| castMap.put(pos, cast); | ||
| } | ||
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| private DecimalData toDecimalData(Number val, LogicalType decimalType) { | ||
| BigDecimal valAsDecimal = BigDecimal.valueOf(val.doubleValue()); | ||
| return toDecimalData(valAsDecimal, decimalType); | ||
| } | ||
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| private DecimalData toDecimalData(BigDecimal valAsDecimal, LogicalType decimalType) { | ||
| return DecimalData.fromBigDecimal( | ||
| valAsDecimal, | ||
| ((DecimalType) decimalType).getPrecision(), | ||
| ((DecimalType) decimalType).getScale()); | ||
| } | ||
|
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| /** | ||
| * Fields {@link Cast#from} and {@link Cast#to} are redundant due to {@link Cast#convert(Object)} determines conversion. | ||
| * However, it is convenient to debug {@link CastMap} when {@link Cast#toString()} prints types. | ||
| */ | ||
| private static final class Cast implements Serializable { | ||
|
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| private static final long serialVersionUID = 1L; | ||
|
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| private final LogicalType from; | ||
| private final LogicalType to; | ||
| private final Function<Object, Object> conversion; | ||
|
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| Cast(LogicalType from, LogicalType to, Function<Object, Object> conversion) { | ||
| this.from = from; | ||
| this.to = to; | ||
| this.conversion = conversion; | ||
| } | ||
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| Object convert(Object val) { | ||
| return conversion.apply(val); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return from + " => " + to; | ||
| } | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return castMap.entrySet().stream() | ||
| .map(e -> e.getKey() + ": " + e.getValue()) | ||
| .collect(Collectors.joining(", ", "{", "}")); | ||
| } | ||
| } |
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