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| 1 | +/* |
| 2 | + * Licensed to the Apache Software Foundation (ASF) under one or more |
| 3 | + * contributor license agreements. See the NOTICE file distributed with |
| 4 | + * this work for additional information regarding copyright ownership. |
| 5 | + * The ASF licenses this file to You under the Apache License, Version 2.0 |
| 6 | + * (the "License"); you may not use this file except in compliance with |
| 7 | + * the License. You may obtain a copy of the License at |
| 8 | + * |
| 9 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | + * |
| 11 | + * Unless required by applicable law or agreed to in writing, software |
| 12 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | + * See the License for the specific language governing permissions and |
| 15 | + * limitations under the License. |
| 16 | + */ |
| 17 | + |
| 18 | +package org.apache.arrow.vector.compare; |
| 19 | + |
| 20 | +import org.apache.arrow.memory.util.ByteFunctionHelpers; |
| 21 | +import org.apache.arrow.vector.BaseFixedWidthVector; |
| 22 | +import org.apache.arrow.vector.BaseVariableWidthVector; |
| 23 | +import org.apache.arrow.vector.ValueVector; |
| 24 | +import org.apache.arrow.vector.complex.BaseRepeatedValueVector; |
| 25 | +import org.apache.arrow.vector.complex.FixedSizeListVector; |
| 26 | +import org.apache.arrow.vector.complex.ListVector; |
| 27 | +import org.apache.arrow.vector.complex.NonNullableStructVector; |
| 28 | + |
| 29 | +/** |
| 30 | + * Utility to compare two single values in two vectors with same type. |
| 31 | + */ |
| 32 | +public class CompareUtility { |
| 33 | + |
| 34 | + /** |
| 35 | + * Compare {@link BaseFixedWidthVector} value equals with given indices and vectors. |
| 36 | + * @param left left vector to compare |
| 37 | + * @param leftIndex left index |
| 38 | + * @param right right vector to compare |
| 39 | + * @param rightIndex right index |
| 40 | + * @return true if equals, otherwise false |
| 41 | + */ |
| 42 | + public static boolean compare(BaseFixedWidthVector left, int leftIndex, BaseFixedWidthVector right, int rightIndex) { |
| 43 | + |
| 44 | + boolean isNull = left.isNull(leftIndex); |
| 45 | + |
| 46 | + if (isNull != right.isNull(rightIndex)) { |
| 47 | + return false; |
| 48 | + } |
| 49 | + |
| 50 | + int typeWidth = left.getTypeWidth(); |
| 51 | + if (!isNull) { |
| 52 | + int startByteLeft = typeWidth * leftIndex; |
| 53 | + int endByteLeft = typeWidth * (leftIndex + 1); |
| 54 | + |
| 55 | + int startByteRight = typeWidth * rightIndex; |
| 56 | + int endByteRight = typeWidth * (rightIndex + 1); |
| 57 | + |
| 58 | + int ret = ByteFunctionHelpers.equal(left.getDataBuffer(), startByteLeft, endByteLeft, |
| 59 | + right.getDataBuffer(), startByteRight, endByteRight); |
| 60 | + |
| 61 | + if (ret == 0) { |
| 62 | + return false; |
| 63 | + } |
| 64 | + |
| 65 | + } |
| 66 | + return true; |
| 67 | + } |
| 68 | + |
| 69 | + /** |
| 70 | + * Compare {@link BaseVariableWidthVector} value equals with given indices and vectors. |
| 71 | + * @param left left vector to compare |
| 72 | + * @param leftIndex left index |
| 73 | + * @param right right vector to compare |
| 74 | + * @param rightIndex right index |
| 75 | + * @return true if equals, otherwise false |
| 76 | + */ |
| 77 | + public static boolean compare(BaseVariableWidthVector left, int leftIndex, |
| 78 | + BaseVariableWidthVector right, int rightIndex) { |
| 79 | + |
| 80 | + boolean isNull = left.isNull(leftIndex); |
| 81 | + if (isNull != right.isNull(rightIndex)) { |
| 82 | + return false; |
| 83 | + } |
| 84 | + |
| 85 | + int offsetWidth = BaseVariableWidthVector.OFFSET_WIDTH; |
| 86 | + |
| 87 | + if (!isNull) { |
| 88 | + final int start1 = left.getOffsetBuffer().getInt(leftIndex * offsetWidth); |
| 89 | + final int end1 = left.getOffsetBuffer().getInt((leftIndex + 1) * offsetWidth); |
| 90 | + |
| 91 | + final int start2 = right.getOffsetBuffer().getInt(rightIndex * offsetWidth); |
| 92 | + final int end2 = right.getOffsetBuffer().getInt((rightIndex + 1) * offsetWidth); |
| 93 | + |
| 94 | + int ret = ByteFunctionHelpers.equal(left.getDataBuffer(), start1, end1, |
| 95 | + right.getDataBuffer(), start2, end2); |
| 96 | + |
| 97 | + if (ret == 0) { |
| 98 | + return false; |
| 99 | + } |
| 100 | + } |
| 101 | + return true; |
| 102 | + } |
| 103 | + |
| 104 | + /** |
| 105 | + * Compare {@link ListVector} value equals with given indices and vectors. |
| 106 | + * @param left left vector to compare |
| 107 | + * @param leftIndex left index |
| 108 | + * @param right right vector to compare |
| 109 | + * @param rightIndex right index |
| 110 | + * @return true if equals, otherwise false |
| 111 | + */ |
| 112 | + public static boolean compare(ListVector left, int leftIndex, ListVector right, int rightIndex) { |
| 113 | + |
| 114 | + boolean isNull = left.isNull(leftIndex); |
| 115 | + if (isNull != right.isNull(rightIndex)) { |
| 116 | + return false; |
| 117 | + } |
| 118 | + |
| 119 | + int offsetWidth = BaseRepeatedValueVector.OFFSET_WIDTH; |
| 120 | + |
| 121 | + if (!isNull) { |
| 122 | + final int startByteLeft = left.getOffsetBuffer().getInt(leftIndex * offsetWidth); |
| 123 | + final int endByteLeft = left.getOffsetBuffer().getInt((leftIndex + 1) * offsetWidth); |
| 124 | + |
| 125 | + final int startByteRight = right.getOffsetBuffer().getInt(rightIndex * offsetWidth); |
| 126 | + final int endByteRight = right.getOffsetBuffer().getInt((rightIndex + 1) * offsetWidth); |
| 127 | + |
| 128 | + if ((endByteLeft - startByteLeft) != (endByteRight - startByteRight)) { |
| 129 | + return false; |
| 130 | + } |
| 131 | + |
| 132 | + ValueVector dataVector1 = left.getDataVector(); |
| 133 | + ValueVector dataVector2 = right.getDataVector(); |
| 134 | + |
| 135 | + if (!dataVector1.accept(new RangeEqualsVisitor(dataVector2, startByteLeft, |
| 136 | + startByteRight, (endByteLeft - startByteLeft)))) { |
| 137 | + return false; |
| 138 | + } |
| 139 | + } |
| 140 | + return true; |
| 141 | + } |
| 142 | + |
| 143 | + /** |
| 144 | + * Compare {@link FixedSizeListVector} value equals with given indices and vectors. |
| 145 | + * @param left left vector to compare |
| 146 | + * @param leftIndex left index |
| 147 | + * @param right right vector to compare |
| 148 | + * @param rightIndex right index |
| 149 | + * @return true if equals, otherwise false |
| 150 | + */ |
| 151 | + public static boolean compare(FixedSizeListVector left, int leftIndex, FixedSizeListVector right, int rightIndex) { |
| 152 | + boolean isNull = left.isNull(leftIndex); |
| 153 | + if (isNull != right.isNull(rightIndex)) { |
| 154 | + return false; |
| 155 | + } |
| 156 | + |
| 157 | + int listSize = left.getListSize(); |
| 158 | + |
| 159 | + if (!isNull) { |
| 160 | + final int start1 = leftIndex * listSize; |
| 161 | + final int end1 = (leftIndex + 1) * listSize; |
| 162 | + |
| 163 | + final int start2 = rightIndex * listSize; |
| 164 | + final int end2 = (rightIndex + 1) * listSize; |
| 165 | + |
| 166 | + if ((end1 - start1) != (end2 - start2)) { |
| 167 | + return false; |
| 168 | + } |
| 169 | + |
| 170 | + ValueVector dataVector1 = left.getDataVector(); |
| 171 | + ValueVector dataVector2 = right.getDataVector(); |
| 172 | + |
| 173 | + if (!dataVector1.accept(new RangeEqualsVisitor(dataVector2, start1, start2, (end1 - start1)))) { |
| 174 | + return false; |
| 175 | + } |
| 176 | + } |
| 177 | + return true; |
| 178 | + } |
| 179 | + |
| 180 | + /** |
| 181 | + * Compare {@link NonNullableStructVector} value equals with given indices and vectors. |
| 182 | + * @param left left vector to compare |
| 183 | + * @param leftIndex left index |
| 184 | + * @param right right vector to compare |
| 185 | + * @param rightIndex right index |
| 186 | + * @return true if equals, otherwise false |
| 187 | + */ |
| 188 | + public static boolean compare(NonNullableStructVector left, int leftIndex, NonNullableStructVector right, |
| 189 | + int rightIndex) { |
| 190 | + boolean isNull = left.isNull(leftIndex); |
| 191 | + if (isNull != right.isNull(rightIndex)) { |
| 192 | + return false; |
| 193 | + } |
| 194 | + |
| 195 | + if (!isNull) { |
| 196 | + if (!left.getChildFieldNames().equals(right.getChildFieldNames())) { |
| 197 | + return false; |
| 198 | + } |
| 199 | + |
| 200 | + for (String name : left.getChildFieldNames()) { |
| 201 | + if (!left.getChild(name).equals(leftIndex, right.getChild(name), rightIndex)) { |
| 202 | + return false; |
| 203 | + } |
| 204 | + } |
| 205 | + } |
| 206 | + return true; |
| 207 | + } |
| 208 | + |
| 209 | + /** |
| 210 | + * Check whether indices are valid. |
| 211 | + */ |
| 212 | + public static boolean checkIndices(ValueVector left, int leftIndex, ValueVector right, int rightIndex) { |
| 213 | + if (leftIndex < 0 || rightIndex < 0) { |
| 214 | + throw new IllegalStateException(String.format("indices must be non negative, left index: %s, right index: %s", |
| 215 | + leftIndex, rightIndex)); |
| 216 | + } |
| 217 | + |
| 218 | + if (leftIndex >= left.getValueCount() || rightIndex >= right.getValueCount()) { |
| 219 | + throw new IllegalStateException(String.format("indices mush be less than valueCount, left index: %s, " + |
| 220 | + "right index: %s, left valueCount: %s, right valueCount: %s", leftIndex, left.getValueCount(), |
| 221 | + rightIndex, right.getValueCount())); |
| 222 | + } |
| 223 | + |
| 224 | + return true; |
| 225 | + } |
| 226 | +} |
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