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[FLINK-3786] [core] [api-extending] Add BigDecimal and BigInteger as …
…Basic types This closes apache#1928.
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118 changes: 118 additions & 0 deletions
118
flink-core/src/main/java/org/apache/flink/api/common/typeutils/base/BigDecComparator.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 | ||
| * | ||
| * https://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.flink.api.common.typeutils.base; | ||
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| import java.io.IOException; | ||
| import java.math.BigDecimal; | ||
| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.core.memory.DataInputView; | ||
| import org.apache.flink.core.memory.MemorySegment; | ||
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| /** | ||
| * Comparator for comparing BigDecimal values. Does not support null values. | ||
| */ | ||
| @Internal | ||
| public final class BigDecComparator extends BasicTypeComparator<BigDecimal> { | ||
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| private static final long serialVersionUID = 1L; | ||
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| private static final long SMALLEST_MAGNITUDE = Integer.MAX_VALUE; | ||
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| private static final long LARGEST_MAGNITUDE = ((long) Integer.MIN_VALUE) - Integer.MAX_VALUE + 1; | ||
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| public BigDecComparator(boolean ascending) { | ||
| super(ascending); | ||
| } | ||
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| @Override | ||
| public int compareSerialized(DataInputView firstSource, DataInputView secondSource) throws IOException { | ||
| BigDecimal bd1 = BigDecSerializer.readBigDecimal(firstSource); | ||
| BigDecimal bd2 = BigDecSerializer.readBigDecimal(secondSource); | ||
| int comp = bd1.compareTo(bd2); // null is not supported | ||
| return ascendingComparison ? comp : -comp; | ||
| } | ||
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| @Override | ||
| public boolean supportsNormalizedKey() { | ||
| return true; | ||
| } | ||
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| @Override | ||
| public boolean supportsSerializationWithKeyNormalization() { | ||
| return false; | ||
| } | ||
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| @Override | ||
| public int getNormalizeKeyLen() { | ||
| return 5; | ||
| } | ||
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| @Override | ||
| public boolean isNormalizedKeyPrefixOnly(int keyBytes) { | ||
| return true; | ||
| } | ||
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| /** | ||
| * Adds a normalized key containing a normalized order of magnitude of the given record. | ||
| * 2 bits determine the sign (negative, zero, positive), 33 bits determine the magnitude. | ||
| * This method adds at most 5 bytes that contain information. | ||
| */ | ||
| @Override | ||
| public void putNormalizedKey(BigDecimal record, MemorySegment target, int offset, int len) { | ||
| final long signum = record.signum(); | ||
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| // order of magnitude | ||
| // smallest: | ||
| // scale = Integer.MAX, precision = 1 => SMALLEST_MAGNITUDE | ||
| // largest: | ||
| // scale = Integer.MIN, precision = Integer.MAX => LARGEST_MAGNITUDE | ||
| final long mag = ((long) record.scale()) - ((long) record.precision()) + 1; | ||
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| // normalize value range: from 0 to (SMALLEST_MAGNITUDE + -1*LARGEST_MAGNITUDE) | ||
| final long normMag = -1L * LARGEST_MAGNITUDE + mag; | ||
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| // normalize value range dependent on sign: | ||
| // 0 to (SMALLEST_MAGNITUDE + -1*LARGEST_MAGNITUDE) | ||
| // OR (SMALLEST_MAGNITUDE + -1*LARGEST_MAGNITUDE) to 0 | ||
| // --> uses at most 33 bit (5 least-significant bytes) | ||
| long signNormMag = signum < 0 ? normMag : (SMALLEST_MAGNITUDE + -1L * LARGEST_MAGNITUDE - normMag); | ||
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| // zero has no magnitude | ||
| // set 34th bit to flag zero | ||
| if (signum == 0) { | ||
| signNormMag = 0L; | ||
| signNormMag |= (1L << 34); | ||
| } | ||
| // set 35th bit to flag positive sign | ||
| else if (signum > 0) { | ||
| signNormMag |= (1L << 35); | ||
| } | ||
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| // add 5 least-significant bytes that contain value to target | ||
| for (int i = 0; i < 5 && len > 0; i++, len--) { | ||
| final byte b = (byte) (signNormMag >>> (8 * (4 - i))); | ||
| target.put(offset++, b); | ||
| } | ||
| } | ||
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| @Override | ||
| public BigDecComparator duplicate() { | ||
| return new BigDecComparator(ascendingComparison); | ||
| } | ||
| } |
141 changes: 141 additions & 0 deletions
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flink-core/src/main/java/org/apache/flink/api/common/typeutils/base/BigDecSerializer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| /* | ||
| * 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 | ||
| * | ||
| * https://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.flink.api.common.typeutils.base; | ||
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| import java.io.IOException; | ||
| import java.math.BigDecimal; | ||
| import java.math.BigInteger; | ||
| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.core.memory.DataInputView; | ||
| import org.apache.flink.core.memory.DataOutputView; | ||
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| /** | ||
| * Serializer for serializing/deserializing BigDecimal values including null values. | ||
| */ | ||
| @Internal | ||
| public final class BigDecSerializer extends TypeSerializerSingleton<BigDecimal> { | ||
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| private static final long serialVersionUID = 1L; | ||
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| public static final BigDecSerializer INSTANCE = new BigDecSerializer(); | ||
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| @Override | ||
| public boolean isImmutableType() { | ||
| return true; | ||
| } | ||
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| @Override | ||
| public BigDecimal createInstance() { | ||
| return BigDecimal.ZERO; | ||
| } | ||
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| @Override | ||
| public BigDecimal copy(BigDecimal from) { | ||
| return from; | ||
| } | ||
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| @Override | ||
| public BigDecimal copy(BigDecimal from, BigDecimal reuse) { | ||
| return from; | ||
| } | ||
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| @Override | ||
| public int getLength() { | ||
| return -1; | ||
| } | ||
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| @Override | ||
| public void serialize(BigDecimal record, DataOutputView target) throws IOException { | ||
| // null value support | ||
| if (record == null) { | ||
| BigIntSerializer.writeBigInteger(null, target); | ||
| return; | ||
| } | ||
| // fast paths for 0, 1, 10 | ||
| // only reference equality is checked because equals would be too expensive | ||
| else if (record == BigDecimal.ZERO) { | ||
| BigIntSerializer.writeBigInteger(BigInteger.ZERO, target); | ||
| target.writeInt(0); | ||
| return; | ||
| } | ||
| else if (record == BigDecimal.ONE) { | ||
| BigIntSerializer.writeBigInteger(BigInteger.ONE, target); | ||
| target.writeInt(0); | ||
| return; | ||
| } | ||
| else if (record == BigDecimal.TEN) { | ||
| BigIntSerializer.writeBigInteger(BigInteger.TEN, target); | ||
| target.writeInt(0); | ||
| return; | ||
| } | ||
| // default | ||
| BigIntSerializer.writeBigInteger(record.unscaledValue(), target); | ||
| target.writeInt(record.scale()); | ||
| } | ||
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| @Override | ||
| public BigDecimal deserialize(DataInputView source) throws IOException { | ||
| return readBigDecimal(source); | ||
| } | ||
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| @Override | ||
| public BigDecimal deserialize(BigDecimal reuse, DataInputView source) throws IOException { | ||
| return readBigDecimal(source); | ||
| } | ||
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| @Override | ||
| public void copy(DataInputView source, DataOutputView target) throws IOException { | ||
| final boolean isNull = BigIntSerializer.copyBigInteger(source, target); | ||
| if (!isNull) { | ||
| final int scale = source.readInt(); | ||
| target.writeInt(scale); | ||
| } | ||
| } | ||
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| @Override | ||
| public boolean canEqual(Object obj) { | ||
| return obj instanceof BigDecSerializer; | ||
| } | ||
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| // -------------------------------------------------------------------------------------------- | ||
| // Static Helpers for BigInteger Serialization | ||
| // -------------------------------------------------------------------------------------------- | ||
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| public static BigDecimal readBigDecimal(DataInputView source) throws IOException { | ||
| final BigInteger unscaledValue = BigIntSerializer.readBigInteger(source); | ||
| if (unscaledValue == null) { | ||
| return null; | ||
| } | ||
| final int scale = source.readInt(); | ||
| // fast-path for 0, 1, 10 | ||
| if (scale == 0) { | ||
| if (unscaledValue == BigInteger.ZERO) { | ||
| return BigDecimal.ZERO; | ||
| } | ||
| else if (unscaledValue == BigInteger.ONE) { | ||
| return BigDecimal.ONE; | ||
| } | ||
| else if (unscaledValue == BigInteger.TEN) { | ||
| return BigDecimal.TEN; | ||
| } | ||
| } | ||
| // default | ||
| return new BigDecimal(unscaledValue, scale); | ||
| } | ||
| } |
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