Examples with ColumnStatistics io.trino.spi.statistics.ColumnStatistics used on opensource projects

Example 1 with ColumnStatistics

use of io.trino.spi.statistics.ColumnStatistics in project trino by trinodb.

the class MetastoreHiveStatisticsProvider method calculateDataSize.

@VisibleForTesting
static Estimate calculateDataSize(String column, Collection<PartitionStatistics> partitionStatistics, double totalRowCount) {
    List<PartitionStatistics> statisticsWithKnownRowCountAndDataSize = partitionStatistics.stream().filter(statistics -> {
        if (statistics.getBasicStatistics().getRowCount().isEmpty()) {
            return false;
        }
        HiveColumnStatistics columnStatistics = statistics.getColumnStatistics().get(column);
        if (columnStatistics == null) {
            return false;
        }
        return columnStatistics.getTotalSizeInBytes().isPresent();
    }).collect(toImmutableList());
    if (statisticsWithKnownRowCountAndDataSize.isEmpty()) {
        return Estimate.unknown();
    }
    long knownRowCount = 0;
    long knownDataSize = 0;
    for (PartitionStatistics statistics : statisticsWithKnownRowCountAndDataSize) {
        long rowCount = statistics.getBasicStatistics().getRowCount().orElseThrow(() -> new VerifyException("rowCount is not present"));
        verify(rowCount >= 0, "rowCount must be greater than or equal to zero");
        HiveColumnStatistics columnStatistics = statistics.getColumnStatistics().get(column);
        verifyNotNull(columnStatistics, "columnStatistics is null");
        long dataSize = columnStatistics.getTotalSizeInBytes().orElseThrow(() -> new VerifyException("totalSizeInBytes is not present"));
        verify(dataSize >= 0, "dataSize must be greater than or equal to zero");
        knownRowCount += rowCount;
        knownDataSize += dataSize;
    }
    if (totalRowCount == 0) {
        return Estimate.zero();
    }
    if (knownRowCount == 0) {
        return Estimate.unknown();
    }
    double averageValueDataSizeInBytes = ((double) knownDataSize) / knownRowCount;
    return Estimate.of(averageValueDataSizeInBytes * totalRowCount);
}

Example 2 with ColumnStatistics

use of io.trino.spi.statistics.ColumnStatistics in project trino by trinodb.

the class MetastoreHiveStatisticsProvider method createZeroStatistics.

private TableStatistics createZeroStatistics(Map<String, ColumnHandle> columns, Map<String, Type> columnTypes) {
    TableStatistics.Builder result = TableStatistics.builder();
    result.setRowCount(Estimate.of(0));
    columns.forEach((columnName, columnHandle) -> {
        Type columnType = columnTypes.get(columnName);
        verifyNotNull(columnType, "columnType is missing for column: %s", columnName);
        ColumnStatistics.Builder columnStatistics = ColumnStatistics.builder();
        columnStatistics.setNullsFraction(Estimate.of(0));
        columnStatistics.setDistinctValuesCount(Estimate.of(0));
        if (hasDataSize(columnType)) {
            columnStatistics.setDataSize(Estimate.of(0));
        }
        result.setColumnStatistics(columnHandle, columnStatistics.build());
    });
    return result.build();
}

Example 3 with ColumnStatistics

use of io.trino.spi.statistics.ColumnStatistics in project trino by trinodb.

the class TestDeltaLakeMetastoreStatistics method testStatisticsNaNWithMultipleFiles.

@Test
public void testStatisticsNaNWithMultipleFiles() {
    // Stats with NaN values cannot be used. This transaction combines a file with NaN min/max values with one with 0.0 min/max values
    DeltaLakeTableHandle tableHandle = registerTable("nan_multi_file");
    TableStatistics stats = deltaLakeMetastore.getTableStatistics(SESSION, tableHandle, Constraint.alwaysTrue());
    ColumnStatistics columnStatistics = stats.getColumnStatistics().get(COLUMN_HANDLE);
    assertEquals(columnStatistics.getRange(), Optional.empty());
}

Example 4 with ColumnStatistics

use of io.trino.spi.statistics.ColumnStatistics in project trino by trinodb.

the class TestDeltaLakeMetastoreStatistics method testStatisticsZeroAndNegativeInfinity.

@Test
public void testStatisticsZeroAndNegativeInfinity() {
    DeltaLakeTableHandle tableHandle = registerTable("zero_negative_infinity");
    TableStatistics stats = deltaLakeMetastore.getTableStatistics(SESSION, tableHandle, Constraint.alwaysTrue());
    ColumnStatistics columnStatistics = stats.getColumnStatistics().get(COLUMN_HANDLE);
    assertEquals(columnStatistics.getRange().get().getMin(), NEGATIVE_INFINITY);
    assertEquals(columnStatistics.getRange().get().getMax(), 0.0);
}

Example 5 with ColumnStatistics

use of io.trino.spi.statistics.ColumnStatistics in project trino by trinodb.

the class TestDeltaLakeMetastoreStatistics method testStatisticsZeroAndNaN.

@Test
public void testStatisticsZeroAndNaN() {
    // Stats with NaN values cannot be used
    DeltaLakeTableHandle tableHandle = registerTable("zero_nan");
    TableStatistics stats = deltaLakeMetastore.getTableStatistics(SESSION, tableHandle, Constraint.alwaysTrue());
    ColumnStatistics columnStatistics = stats.getColumnStatistics().get(COLUMN_HANDLE);
    assertEquals(columnStatistics.getRange().get().getMin(), 0.0);
    assertEquals(columnStatistics.getRange().get().getMax(), POSITIVE_INFINITY);
}