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[core] Introduce metadata.stats-dense-store to reduce meta size for m…
…ultiple columns table (#4322)
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paimon-common/src/main/java/org/apache/paimon/utils/ProjectedArray.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.paimon.utils; | ||
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| import org.apache.paimon.data.BinaryString; | ||
| import org.apache.paimon.data.Decimal; | ||
| import org.apache.paimon.data.InternalArray; | ||
| import org.apache.paimon.data.InternalMap; | ||
| import org.apache.paimon.data.InternalRow; | ||
| import org.apache.paimon.data.Timestamp; | ||
| import org.apache.paimon.types.DataType; | ||
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| /** | ||
| * An implementation of {@link InternalArray} which provides a projected view of the underlying | ||
| * {@link InternalArray}. | ||
| * | ||
| * <p>Projection includes both reducing the accessible fields and reordering them. | ||
| * | ||
| * <p>Note: This class supports only top-level projections, not nested projections. | ||
| */ | ||
| public class ProjectedArray implements InternalArray { | ||
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| private final int[] indexMapping; | ||
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| private InternalArray array; | ||
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| private ProjectedArray(int[] indexMapping) { | ||
| this.indexMapping = indexMapping; | ||
| } | ||
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| /** | ||
| * Replaces the underlying {@link InternalArray} backing this {@link ProjectedArray}. | ||
| * | ||
| * <p>This method replaces the row data in place and does not return a new object. This is done | ||
| * for performance reasons. | ||
| */ | ||
| public ProjectedArray replaceArray(InternalArray array) { | ||
| this.array = array; | ||
| return this; | ||
| } | ||
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| // --------------------------------------------------------------------------------------------- | ||
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| @Override | ||
| public int size() { | ||
| return indexMapping.length; | ||
| } | ||
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| @Override | ||
| public boolean isNullAt(int pos) { | ||
| if (indexMapping[pos] < 0) { | ||
| return true; | ||
| } | ||
| return array.isNullAt(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public boolean getBoolean(int pos) { | ||
| return array.getBoolean(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public byte getByte(int pos) { | ||
| return array.getByte(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public short getShort(int pos) { | ||
| return array.getShort(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public int getInt(int pos) { | ||
| return array.getInt(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public long getLong(int pos) { | ||
| return array.getLong(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public float getFloat(int pos) { | ||
| return array.getFloat(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public double getDouble(int pos) { | ||
| return array.getDouble(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public BinaryString getString(int pos) { | ||
| return array.getString(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public Decimal getDecimal(int pos, int precision, int scale) { | ||
| return array.getDecimal(indexMapping[pos], precision, scale); | ||
| } | ||
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| @Override | ||
| public Timestamp getTimestamp(int pos, int precision) { | ||
| return array.getTimestamp(indexMapping[pos], precision); | ||
| } | ||
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| @Override | ||
| public byte[] getBinary(int pos) { | ||
| return array.getBinary(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public InternalArray getArray(int pos) { | ||
| return array.getArray(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public InternalMap getMap(int pos) { | ||
| return array.getMap(indexMapping[pos]); | ||
| } | ||
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| @Override | ||
| public InternalRow getRow(int pos, int numFields) { | ||
| return array.getRow(indexMapping[pos], numFields); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| throw new UnsupportedOperationException("Projected row data cannot be compared"); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| throw new UnsupportedOperationException("Projected row data cannot be hashed"); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| throw new UnsupportedOperationException("Projected row data cannot be toString"); | ||
| } | ||
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| /** | ||
| * Create an empty {@link ProjectedArray} starting from a {@code projection} array. | ||
| * | ||
| * <p>The array represents the mapping of the fields of the original {@link DataType}. For | ||
| * example, {@code [0, 2, 1]} specifies to include in the following order the 1st field, the 3rd | ||
| * field and the 2nd field of the row. | ||
| * | ||
| * @see Projection | ||
| * @see ProjectedArray | ||
| */ | ||
| public static ProjectedArray from(int[] projection) { | ||
| return new ProjectedArray(projection); | ||
| } | ||
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| @Override | ||
| public boolean[] toBooleanArray() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public byte[] toByteArray() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public short[] toShortArray() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public int[] toIntArray() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public long[] toLongArray() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public float[] toFloatArray() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public double[] toDoubleArray() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
| } |
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