Package org.apache.druid.segment.column

Interface SelectableColumn

All Known Subinterfaces:
BaseColumn, ComplexColumn, DictionaryEncodedColumn<ActualType>, NestedCommonFormatColumn, NumericColumn
All Known Implementing Classes:
CompressedComplexColumn, CompressedNestedDataComplexColumn, ConstantTimeColumn, DoublesColumn, FeaturelessSelectableColumn, FloatsColumn, GenericIndexedBasedComplexColumn, LongsColumn, NestedDataColumnV3, NestedDataColumnV4, NestedDataColumnV5, NestedDataComplexColumn, NestedFieldDictionaryEncodedColumn, NumericArrayFrameColumnReader.NumericArrayFrameColumn, ScalarDoubleColumn, ScalarLongColumn, SerializablePairLongDoubleComplexColumn, SerializablePairLongFloatComplexColumn, SerializablePairLongLongComplexColumn, SerializablePairLongStringComplexColumn, StringUtf8DictionaryEncodedColumn, UnknownTypeComplexColumn, VariantColumn
public interface SelectableColumn
Class returned by ColumnHolder. Represents a physical or virtual column that can potentially be used in specialized ways. Currently, this class has no ability to directly make selectors, so it doesn't provide a way to unify e.g. VirtualColumn.makeColumnValueSelector(java.lang.String, org.apache.druid.segment.ColumnSelectorFactory, org.apache.druid.segment.ColumnSelector, org.apache.druid.segment.data.ReadableOffset) and BaseColumn.makeColumnValueSelector(org.apache.druid.segment.data.ReadableOffset). This may be added in the future, but for now it happens as part of the creation of a Cursor.

  • Method Summary

    Modifier and Type
    Method
    Description
    default <T> T
    as(Class<T> clazz)
    Request an implementation of a particular interface.