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apacheGH-39484: [Java] Support 256 bit decimals in JdbcToArrowUtils (a…
…pache#39485) ### Rationale for this change This PR allows users of `JdbcToArrowUtils` to convert 256 bit decimals. ### What changes are included in this PR? Add a `Decimal256Consumer` and logic to ### Are these changes tested? No, at this point there are no good tests for JDBC consumers. ### Are there any user-facing changes? Converting 256 bit decimals and ints bigger than 64 bit should now work * Closes: apache#39484 Authored-by: Diego Fernandez <aiguo.fernandez@gmail.com> Signed-off-by: David Li <li.davidm96@gmail.com>
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...adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/consumer/Decimal256Consumer.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.arrow.adapter.jdbc.consumer; | ||
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| import java.math.BigDecimal; | ||
| import java.math.RoundingMode; | ||
| import java.sql.ResultSet; | ||
| import java.sql.SQLException; | ||
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| import org.apache.arrow.vector.Decimal256Vector; | ||
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| /** | ||
| * Consumer which consume decimal type values from {@link ResultSet}. | ||
| * Write the data to {@link org.apache.arrow.vector.Decimal256Vector}. | ||
| */ | ||
| public abstract class Decimal256Consumer extends BaseConsumer<Decimal256Vector> { | ||
| private final RoundingMode bigDecimalRoundingMode; | ||
| private final int scale; | ||
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| /** | ||
| * Constructs a new consumer. | ||
| * | ||
| * @param vector the underlying vector for the consumer. | ||
| * @param index the column id for the consumer. | ||
| */ | ||
| public Decimal256Consumer(Decimal256Vector vector, int index) { | ||
| this(vector, index, null); | ||
| } | ||
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| /** | ||
| * Constructs a new consumer, with optional coercibility. | ||
| * @param vector the underlying vector for the consumer. | ||
| * @param index the column index for the consumer. | ||
| * @param bigDecimalRoundingMode java.math.RoundingMode to be applied if the BigDecimal scale does not match that | ||
| * of the target vector. Set to null to retain strict matching behavior (scale of | ||
| * source and target vector must match exactly). | ||
| */ | ||
| public Decimal256Consumer(Decimal256Vector vector, int index, RoundingMode bigDecimalRoundingMode) { | ||
| super(vector, index); | ||
| this.bigDecimalRoundingMode = bigDecimalRoundingMode; | ||
| this.scale = vector.getScale(); | ||
| } | ||
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| /** | ||
| * Creates a consumer for {@link Decimal256Vector}. | ||
| */ | ||
| public static JdbcConsumer<Decimal256Vector> createConsumer( | ||
| Decimal256Vector vector, | ||
| int index, | ||
| boolean nullable, | ||
| RoundingMode bigDecimalRoundingMode | ||
| ) { | ||
| if (nullable) { | ||
| return new NullableDecimal256Consumer(vector, index, bigDecimalRoundingMode); | ||
| } else { | ||
| return new NonNullableDecimal256Consumer(vector, index, bigDecimalRoundingMode); | ||
| } | ||
| } | ||
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| protected void set(BigDecimal value) { | ||
| if (bigDecimalRoundingMode != null && value.scale() != scale) { | ||
| value = value.setScale(scale, bigDecimalRoundingMode); | ||
| } | ||
| vector.set(currentIndex, value); | ||
| } | ||
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| /** | ||
| * Consumer for nullable decimal. | ||
| */ | ||
| static class NullableDecimal256Consumer extends Decimal256Consumer { | ||
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| /** | ||
| * Instantiate a Decimal256Consumer. | ||
| */ | ||
| public NullableDecimal256Consumer(Decimal256Vector vector, int index, RoundingMode bigDecimalRoundingMode) { | ||
| super(vector, index, bigDecimalRoundingMode); | ||
| } | ||
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| @Override | ||
| public void consume(ResultSet resultSet) throws SQLException { | ||
| BigDecimal value = resultSet.getBigDecimal(columnIndexInResultSet); | ||
| if (!resultSet.wasNull()) { | ||
| // for fixed width vectors, we have allocated enough memory proactively, | ||
| // so there is no need to call the setSafe method here. | ||
| set(value); | ||
| } | ||
| currentIndex++; | ||
| } | ||
| } | ||
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| /** | ||
| * Consumer for non-nullable decimal. | ||
| */ | ||
| static class NonNullableDecimal256Consumer extends Decimal256Consumer { | ||
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| /** | ||
| * Instantiate a Decimal256Consumer. | ||
| */ | ||
| public NonNullableDecimal256Consumer(Decimal256Vector vector, int index, RoundingMode bigDecimalRoundingMode) { | ||
| super(vector, index, bigDecimalRoundingMode); | ||
| } | ||
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| @Override | ||
| public void consume(ResultSet resultSet) throws SQLException { | ||
| BigDecimal value = resultSet.getBigDecimal(columnIndexInResultSet); | ||
| // for fixed width vectors, we have allocated enough memory proactively, | ||
| // so there is no need to call the setSafe method here. | ||
| set(value); | ||
| currentIndex++; | ||
| } | ||
| } | ||
| } |