tkalkirill commented on code in PR #1407:
URL: https://github.com/apache/ignite-3/pull/1407#discussion_r1044185709
##########
modules/storage-api/src/testFixtures/java/org/apache/ignite/internal/storage/index/AbstractSortedIndexStorageTest.java:
##########
@@ -579,6 +585,401 @@ void testNullValues(ColumnDefinition columnDefinition)
throws Exception {
}
}
+ /**
+ * Checks simple scenarios for a scanning cursor.
+ */
+ @Test
+ void testScanSimple() {
+ SortedIndexDefinition indexDefinition =
SchemaBuilders.sortedIndex("TEST_IDX")
+
.addIndexColumn(ColumnType.INT32.typeSpec().name()).asc().done()
+ .build();
+
+ SortedIndexStorage indexStorage = createIndexStorage(indexDefinition);
+
+ BinaryTupleRowSerializer serializer = new
BinaryTupleRowSerializer(indexStorage.indexDescriptor());
+
+ for (int i = 0; i < 5; i++) {
+ put(indexStorage, serializer.serializeRow(new Object[]{i}, new
RowId(TEST_PARTITION)));
+ }
+
+ // Checking without borders.
+ assertThat(
+ scan(indexStorage, null, null, 0).stream().map(objects ->
objects[0]).collect(toList()),
+ contains(0, 1, 2, 3, 4)
+ );
+
+ // Let's check without borders.
+ assertThat(
+ indexStorage.scan(
+ serializer.serializeRowPrefix(0),
+ serializer.serializeRowPrefix(4),
+ (GREATER_OR_EQUAL | LESS_OR_EQUAL)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(0, 1, 2, 3, 4)
+ );
+
+ assertThat(
+ indexStorage.scan(
+ serializer.serializeRowPrefix(0),
+ serializer.serializeRowPrefix(4),
+ (GREATER_OR_EQUAL | LESS)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(0, 1, 2, 3)
+ );
+
+ assertThat(
+ indexStorage.scan(
+ serializer.serializeRowPrefix(0),
+ serializer.serializeRowPrefix(4),
+ (GREATER | LESS_OR_EQUAL)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(1, 2, 3, 4)
+ );
+
+ assertThat(
+ indexStorage.scan(
+ serializer.serializeRowPrefix(0),
+ serializer.serializeRowPrefix(4),
+ (GREATER | LESS)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(1, 2, 3)
+ );
+
+ // Let's check only with the lower bound.
+ assertThat(
+ indexStorage.scan(
+ serializer.serializeRowPrefix(1),
+ null,
+ (GREATER_OR_EQUAL | LESS_OR_EQUAL)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(1, 2, 3, 4)
+ );
+
+ assertThat(
+ indexStorage.scan(
+ serializer.serializeRowPrefix(1),
+ null,
+ (GREATER_OR_EQUAL | LESS)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(1, 2, 3, 4)
+ );
+
+ assertThat(
+ indexStorage.scan(
+ serializer.serializeRowPrefix(1),
+ null,
+ (GREATER | LESS_OR_EQUAL)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(2, 3, 4)
+ );
+
+ assertThat(
+ indexStorage.scan(
+ serializer.serializeRowPrefix(1),
+ null,
+ (GREATER | LESS)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(2, 3, 4)
+ );
+
+ // Let's check only with the upper bound.
+ assertThat(
+ indexStorage.scan(
+ null,
+ serializer.serializeRowPrefix(3),
+ (GREATER_OR_EQUAL | LESS_OR_EQUAL)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(0, 1, 2, 3)
+ );
+
+ assertThat(
+ indexStorage.scan(
+ null,
+ serializer.serializeRowPrefix(3),
+ (GREATER_OR_EQUAL | LESS)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(0, 1, 2)
+ );
+
+ assertThat(
+ indexStorage.scan(
+ null,
+ serializer.serializeRowPrefix(3),
+ (GREATER | LESS_OR_EQUAL)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(0, 1, 2, 3)
+ );
+
+ assertThat(
+ indexStorage.scan(
+ null,
+ serializer.serializeRowPrefix(3),
+ (GREATER | LESS)
+ ).stream()
+ .map(indexRow ->
serializer.deserializeColumns(indexRow)[0])
+ .collect(toList()),
+ contains(0, 1, 2)
+ );
+ }
+
+ @Test
+ void testScanContractForEmptyIndex() {
+ SortedIndexDefinition indexDefinition =
SchemaBuilders.sortedIndex("TEST_IDX")
+
.addIndexColumn(ColumnType.INT32.typeSpec().name()).asc().done()
+ .build();
+
+ SortedIndexStorage indexStorage = createIndexStorage(indexDefinition);
+
+ BinaryTupleRowSerializer serializer = new
BinaryTupleRowSerializer(indexStorage.indexDescriptor());
+
+ Cursor<IndexRow> scanBeforeHashNext = indexStorage.scan(null, null, 0);
+
+ Cursor<IndexRow> scanAfterHasNext = indexStorage.scan(null, null, 0);
+
+ assertFalse(scanAfterHasNext.hasNext());
+
+ Cursor<IndexRow> scanWithoutHasNext = indexStorage.scan(null, null, 0);
+
+ put(indexStorage, serializer.serializeRow(new Object[]{0}, new
RowId(TEST_PARTITION)));
+
+ assertTrue(scanBeforeHashNext.hasNext());
+ assertFalse(scanAfterHasNext.hasNext());
+
+ assertEquals(0,
serializer.deserializeColumns(scanBeforeHashNext.next())[0]);
+
+ assertThrows(NoSuchElementException.class, scanAfterHasNext::next);
Review Comment:
Method `java.util.Iterator#hasNext` and `java.util.Iterator#next` should be
consistent, I don't think it needs to be described in the documentation.
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