Examples with IndexSample org.neo4j.kernel.api.index.IndexSample used on opensource projects

Example 16 with IndexSample

use of org.neo4j.kernel.api.index.IndexSample in project neo4j by neo4j.

the class UniqueDatabaseIndexPopulatingUpdaterTest method verifySamplingResult.

private static void verifySamplingResult(UniqueIndexSampler sampler, long expectedValue) {
    IndexSample sample = sampler.result();
    assertEquals(expectedValue, sample.indexSize());
    assertEquals(expectedValue, sample.uniqueValues());
    assertEquals(expectedValue, sample.sampleSize());
}

Example 17 with IndexSample

use of org.neo4j.kernel.api.index.IndexSample in project neo4j by neo4j.

the class PartitionedValueIndexReaderTest method samplingOverPartitions.

@Test
void samplingOverPartitions() throws IndexNotFoundKernelException {
    PartitionedValueIndexReader indexReader = createPartitionedReaderFromReaders();
    when(indexReader1.createSampler()).thenReturn(new SimpleSampler(1));
    when(indexReader2.createSampler()).thenReturn(new SimpleSampler(2));
    when(indexReader3.createSampler()).thenReturn(new SimpleSampler(3));
    IndexSampler sampler = indexReader.createSampler();
    assertEquals(new IndexSample(6, 6, 6), sampler.sampleIndex(NULL));
}

Example 18 with IndexSample

use of org.neo4j.kernel.api.index.IndexSample in project neo4j by neo4j.

the class AggregatingIndexSamplerTest method samplePartitionedIndex.

@Test
void samplePartitionedIndex() {
    List<IndexSampler> samplers = Arrays.asList(createSampler(1), createSampler(2));
    AggregatingIndexSampler partitionedSampler = new AggregatingIndexSampler(samplers);
    IndexSample sample = partitionedSampler.sampleIndex(NULL);
    assertEquals(new IndexSample(3, 3, 6), sample);
}

Example 19 with IndexSample

use of org.neo4j.kernel.api.index.IndexSample in project neo4j by neo4j.

the class AllStoreHolder method indexUniqueValuesSelectivity.

@Override
public double indexUniqueValuesSelectivity(IndexDescriptor index) throws IndexNotFoundKernelException {
    assertValidIndex(index);
    acquireSharedSchemaLock(index);
    ktx.assertOpen();
    // Throws if the index has been dropped.
    assertIndexExists(index);
    final IndexSample indexSample = indexStatisticsStore.indexSample(index.getId());
    long unique = indexSample.uniqueValues();
    long size = indexSample.sampleSize();
    return size == 0 ? 1.0d : ((double) unique) / ((double) size);
}

Example 20 with IndexSample

use of org.neo4j.kernel.api.index.IndexSample in project neo4j by neo4j.

the class IndexingServiceTest method setUp.

@BeforeEach
void setUp() throws IndexNotFoundKernelException {
    when(populator.sample(any(CursorContext.class))).thenReturn(new IndexSample());
    when(indexStatisticsStore.indexSample(anyLong())).thenReturn(new IndexSample());
    when(storeViewFactory.createTokenIndexStoreView(any())).thenReturn(storeView);
    when(storeView.newPropertyAccessor(any(CursorContext.class), any())).thenReturn(propertyAccessor);
    ValueIndexReader indexReader = mock(ValueIndexReader.class);
    IndexSampler indexSampler = mock(IndexSampler.class);
    when(indexSampler.sampleIndex(any())).thenReturn(new IndexSample());
    when(indexReader.createSampler()).thenReturn(indexSampler);
    when(accessor.newValueReader()).thenReturn(indexReader);
}