ibessonov commented on code in PR #5686:
URL: https://github.com/apache/ignite-3/pull/5686#discussion_r2071394218
##########
modules/storage-api/src/main/java/org/apache/ignite/internal/storage/util/StorageUtils.java:
##########
@@ -291,4 +292,19 @@ public static BinaryTupleComparator
binaryTupleComparator(List<StorageSortedInde
return new BinaryTupleComparator(columnCollation, columnTypes);
}
+
+ /**
+ * Creates a comparator for a Sorted Index identified by the given columns
descriptors.
+ */
+ public static PartialBinaryTupleComparator
partialBinaryTupleComparator(List<StorageSortedIndexColumnDescriptor> columns) {
+ List<CatalogColumnCollation> columnCollation = new
ArrayList<>(columns.size());
+ List<NativeType> columnTypes = new ArrayList<>(columns.size());
+
+ for (StorageSortedIndexColumnDescriptor col : columns) {
+ columnCollation.add(CatalogColumnCollation.get(col.asc(),
!col.asc()));
Review Comment:
Please add a comment that would explain why `nullsFirst` is `!col.asc()`,
it's not really obvious
##########
modules/core/src/main/java/org/apache/ignite/internal/util/ByteUtils.java:
##########
@@ -412,4 +413,23 @@ public static UUID bytesToUuid(byte[] bytes, int offset) {
return new UUID(higher, lower);
}
+
+ /**
+ * Truncates a byte array to the size specified.
+ *
+ * @param bytes Origin byte array.
+ * @param maxLength Length of truncate.
+ * @return Truncated array.
+ */
+ public static byte @Nullable [] trimToSize(byte[] bytes, int maxLength) {
+ if (bytes == null) {
+ return null;
+ }
+
+ if (maxLength <= 0) {
+ return new byte[0];
Review Comment:
```suggestion
return ArrayUtils.BYTE_EMPTY_ARRAY;
```
##########
modules/schema/src/main/java/org/apache/ignite/internal/schema/BinaryTupleComparatorUtils.java:
##########
@@ -0,0 +1,305 @@
+/*
+ * 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.
+ */
+
+package org.apache.ignite.internal.schema;
+
+import static java.lang.Integer.signum;
+import static
org.apache.ignite.internal.binarytuple.BinaryTupleCommon.EQUALITY_FLAG;
+import static org.apache.ignite.internal.lang.IgniteStringFormatter.format;
+
+import java.math.BigDecimal;
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+import org.apache.ignite.internal.binarytuple.BinaryTupleReader;
+import org.apache.ignite.internal.type.NativeTypeSpec;
+
+/**
+ * The utility class has methods to use to compare fields in binary
representation.
+ */
+class BinaryTupleComparatorUtils {
+ /**
+ * Compares individual fields of two tuples using ascending order.
+ */
+ @SuppressWarnings("DataFlowIssue")
+ static int compareFieldValue(NativeTypeSpec typeSpec, BinaryTupleReader
tuple1, int index1, BinaryTupleReader tuple2, int index2) {
+ switch (typeSpec) {
+ case INT8:
+ case BOOLEAN:
+ return Byte.compare(tuple1.byteValue(index1),
tuple2.byteValue(index2));
+
+ case INT16:
+ return Short.compare(tuple1.shortValue(index1),
tuple2.shortValue(index2));
+
+ case INT32:
+ return Integer.compare(tuple1.intValue(index1),
tuple2.intValue(index2));
+
+ case INT64:
+ return Long.compare(tuple1.longValue(index1),
tuple2.longValue(index2));
+
+ case FLOAT:
+ return Float.compare(tuple1.floatValue(index1),
tuple2.floatValue(index2));
+
+ case DOUBLE:
+ return Double.compare(tuple1.doubleValue(index1),
tuple2.doubleValue(index2));
+
+ case BYTES:
+ return Arrays.compareUnsigned(tuple1.bytesValue(index1),
tuple2.bytesValue(index2));
+
+ case UUID:
+ return
tuple1.uuidValue(index1).compareTo(tuple2.uuidValue(index2));
+
+ case STRING:
+ return
tuple1.stringValue(index1).compareTo(tuple2.stringValue(index2));
+
+ case DECIMAL:
+ BigDecimal numeric1 = tuple1.decimalValue(index1,
Integer.MIN_VALUE);
+ BigDecimal numeric2 = tuple2.decimalValue(index2,
Integer.MIN_VALUE);
+
+ return numeric1.compareTo(numeric2);
+
+ case TIMESTAMP:
+ return
tuple1.timestampValue(index1).compareTo(tuple2.timestampValue(index2));
+
+ case DATE:
+ return
tuple1.dateValue(index1).compareTo(tuple2.dateValue(index2));
+
+ case TIME:
+ return
tuple1.timeValue(index1).compareTo(tuple2.timeValue(index2));
+
+ case DATETIME:
+ return
tuple1.dateTimeValue(index1).compareTo(tuple2.dateTimeValue(index2));
+
+ default:
+ throw new IllegalArgumentException(format("Unsupported column
type in binary tuple comparator. [type={}]", typeSpec));
+ }
+ }
+
+ static boolean isFlagSet(ByteBuffer tuple, int flag) {
+ return (tuple.get(0) & flag) != 0;
+ }
+
+ static int equalityFlag(ByteBuffer tuple) {
+ return isFlagSet(tuple, EQUALITY_FLAG) ? 1 : -1;
+ }
+
+ /**
+ * Compares a value in a binary tuple, interpreted as a string, with a
given string.
+ * The comparison can be performed as case-sensitive or case-insensitive.
+ * The method first attempts a fast comparison for ASCII sequences and
falls back
+ * to Unicode comparison if non-ASCII characters are detected.
+ *
+ * @param tuple The BinaryTupleReader containing the tuple to be compared.
+ * @param colIndex The column index in the tuple to retrieve the value for
comparison.
+ * @param cmp The string to compare the value in the tuple against.
+ * @param ignoreCase Flag indicating whether the comparison should ignore
case differences.
+ * @return 0 if the strings are equal, a negative value if the tuple
string is lexicographically
+ * less than the given string, or a positive value if it is
greater.
+ */
+ static int compareAsString(BinaryTupleReader tuple, int colIndex, String
cmp, boolean ignoreCase) {
+ tuple.seek(colIndex);
+ int begin = tuple.begin();
+ int end = tuple.end();
+
+ ByteBuffer buf = tuple.byteBuffer();
+ int fullSrtLength = end - begin;
+ int trimmedSize = Math.min(fullSrtLength, buf.capacity() - begin);
+ byte[] bytes = new byte[trimmedSize];
+
+ buf.duplicate().position(begin).limit(begin + trimmedSize).get(bytes);
+
+ char[] cmpArray = cmp.toCharArray();
Review Comment:
I'm not really convinced that we need to copy these arrays, especially in
case of `cmpArray`. I presume that version without copying was slower, is that
the case? Please add some small comment
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