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[HUDI-3981] Flink engine support for comprehensive schema evolution #5830
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220 changes: 220 additions & 0 deletions
220
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 | ||
*/ | ||
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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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Add pre-condition check in case of null values.
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replaced with
isPresent()