@EverythingIsNonnullByDefault

Package org.apache.druid.segment.column

Interface Summary

Interface	Description
BaseColumn
ColumnCapabilities	This interface is used to expose information about columns that is interesting to know for all matters dealing with reading from columns, including query planning and optimization, creating readers to merge segments at ingestion time, and probably nearly anything else you can imagine.
ColumnCapabilities.CoercionLogic	This interface defines the shape of a mechnism to allow for bespoke coercion of ColumnCapabilities.Capable.UNKNOWN into ColumnCapabilities.Capable.TRUE or ColumnCapabilities.Capable.FALSE for each ColumnCapabilities.Capable of a ColumnCapabilities, as is appropriate for the situation of the caller.
ColumnConfig
ColumnFormat
ColumnHolder
ColumnIndexCapabilities	Sort of like ColumnCapabilities, except for indexes supplied by ColumnIndexSelector, provides information for how query processing may use indexes.
ColumnIndexSupplier	Provides indexes and information about them (ColumnIndexCapabilities) for a column.
ComplexColumn	This interface represents a complex column and can be implemented by druid extension writer of a custom column with arbitrary serialization instead of a custom column that serializes rows of objects serialized using GenericIndexed class which is default implementation of "writeToXXX" methods in ComplexColumnSerializer.
DictionaryEncodedColumn<ActualType extends Comparable<? super ActualType>>
NumericColumn
StringEncodingStrategy
TypeDescriptor	This is a bridge between ValueType and ExprType, so that they can both be used with TypeSignature.
TypeFactory<Type extends TypeSignature<? extends TypeDescriptor>>	Create TypeSignature of a TypeDescriptor.
TypeSignature<Type extends TypeDescriptor>	This interface serves as a common foundation for Druids native type system, and provides common methods for reasoning about and handling type matters.
TypeStrategy<T>	TypeStrategy provides value comparison and binary serialization for Druid types.

Class Summary

Class	Description
BaseTypeSignature<Type extends TypeDescriptor>
CapabilitiesBasedFormat
ColumnBuilder
ColumnCapabilitiesImpl
ColumnDescriptor
ColumnDescriptor.Builder
ColumnType	Native Druid types.
ColumnTypeFactory
DoublesColumn
FloatsColumn
GenericIndexedBasedComplexColumn	Implementation of ComplexColumn to be used when complex column serialization is done by using GenericIndexed by using default implementations of "writeToXXX" methods in ComplexColumnSerializer
LongsColumn
NullableTypeStrategy<T>	Wrapper of TypeStrategy for nullable types, which stores NullHandling.IS_NULL_BYTE or NullHandling.IS_NOT_NULL_BYTE in the leading byte of any value, as appropriate.
ObjectStrategyComplexTypeStrategy<T>	Default implementation of TypeStrategy for all ComplexMetricSerde implementations that just wraps the ObjectStrategy they are required to implement.
RowSignature	Type signature for a row in a Druid datasource or query result.
RowSignature.Builder
SimpleColumnIndexCapabilities
StringEncodingStrategies
StringEncodingStrategies.Utf8ToStringIndexed	Adapter to convert Indexed with utf8 encoded bytes into Indexed to be friendly to consumers.
StringEncodingStrategy.FrontCoded
StringEncodingStrategy.Utf8
StringUtf8DictionaryEncodedColumn	DictionaryEncodedColumn for a column which has a ByteBuffer based UTF-8 dictionary.
StringUtf8DictionaryEncodedColumn.MultiValueStringVectorObjectSelector	Base type for a VectorObjectSelector for a dictionary encoded ColumnType.STRING built around a ColumnarMultiInts.
StringUtf8DictionaryEncodedColumn.StringMultiValueDimensionVectorSelector	Base type for a MultiValueDimensionVectorSelector for a dictionary encoded ColumnType.STRING built around a ColumnarMultiInts.
StringUtf8DictionaryEncodedColumn.StringSingleValueDimensionVectorSelector	Base type for a SingleValueDimensionVectorSelector for a dictionary encoded ColumnType.STRING built around a ColumnarInts.
StringUtf8DictionaryEncodedColumn.StringVectorObjectSelector	Base type for a VectorObjectSelector for a dictionary encoded ColumnType.STRING built around a ColumnarInts.
Types
TypeStrategies
TypeStrategies.ArrayTypeStrategy	Read and write a non-null ARRAY which is permitted to have null elements (all elements are always read and written with a NullableTypeStrategy wrapper on the TypeStrategy of the TypeSignature.getElementType().
TypeStrategies.DoubleTypeStrategy	Read and write non-null DOUBLE values.
TypeStrategies.FloatTypeStrategy	Read and write non-null FLOAT values.
TypeStrategies.LongTypeStrategy	Read and write non-null LONG values.
TypeStrategies.StringTypeStrategy	Read and write non-null UTF8 encoded String values.
UnknownTypeComplexColumn
ValueTypes

Enum Summary

Enum	Description
ColumnCapabilities.Capable
RowSignature.Finalization
ValueType	This enumeration defines the high level classification of the Druid type system, used by ColumnType to indicate the type of data stored in columns and produced by expressions and aggregations, used to allow query processing engine algorithms to compute results, used to compute query result row signatures, and all other type needs.

Exception Summary

Exception	Description
Types.IncompatibleTypeException
Types.InvalidCastBooleanException
Types.InvalidCastException