Uses of Package
org.apache.druid.segment.column

Packages that use org.apache.druid.segment.column

Package	Description
org.apache.druid.data.input
org.apache.druid.data.input.impl
org.apache.druid.data.input.impl.systemfield
org.apache.druid.frame.field
org.apache.druid.frame.key
org.apache.druid.frame.processor
org.apache.druid.frame.read
org.apache.druid.frame.read.columnar
org.apache.druid.frame.segment
org.apache.druid.frame.segment.columnar
org.apache.druid.frame.segment.row
org.apache.druid.frame.util
org.apache.druid.frame.wire
org.apache.druid.frame.write
org.apache.druid.frame.write.cast
org.apache.druid.frame.write.columnar
org.apache.druid.java.util.common.io.smoosh
org.apache.druid.math.expr
org.apache.druid.math.expr.vector
org.apache.druid.query
org.apache.druid.query.aggregation
org.apache.druid.query.aggregation.any
org.apache.druid.query.aggregation.cardinality
org.apache.druid.query.aggregation.cardinality.types
org.apache.druid.query.aggregation.cardinality.vector
org.apache.druid.query.aggregation.firstlast
org.apache.druid.query.aggregation.firstlast.first
org.apache.druid.query.aggregation.firstlast.last
org.apache.druid.query.aggregation.hyperloglog
org.apache.druid.query.aggregation.mean
org.apache.druid.query.aggregation.post
org.apache.druid.query.dimension
org.apache.druid.query.filter
org.apache.druid.query.filter.vector
org.apache.druid.query.groupby
org.apache.druid.query.groupby.epinephelinae
org.apache.druid.query.groupby.epinephelinae.column
org.apache.druid.query.groupby.epinephelinae.vector
org.apache.druid.query.metadata.metadata
org.apache.druid.query.operator
org.apache.druid.query.operator.window.value
org.apache.druid.query.rowsandcols
org.apache.druid.query.rowsandcols.column
org.apache.druid.query.rowsandcols.column.accessor
org.apache.druid.query.rowsandcols.concrete
org.apache.druid.query.rowsandcols.semantic
org.apache.druid.query.scan
org.apache.druid.query.timeboundary
org.apache.druid.query.timeseries
org.apache.druid.query.topn
org.apache.druid.query.topn.types
org.apache.druid.query.union
org.apache.druid.segment
org.apache.druid.segment.column
org.apache.druid.segment.data
org.apache.druid.segment.file
org.apache.druid.segment.filter
org.apache.druid.segment.generator
org.apache.druid.segment.incremental
org.apache.druid.segment.index
org.apache.druid.segment.index.semantic
org.apache.druid.segment.join
org.apache.druid.segment.join.filter
org.apache.druid.segment.join.lookup
org.apache.druid.segment.join.table
org.apache.druid.segment.nested
org.apache.druid.segment.projections
org.apache.druid.segment.serde
org.apache.druid.segment.shim
org.apache.druid.segment.vector
org.apache.druid.segment.virtual

Classes in org.apache.druid.segment.column used by org.apache.druid.data.input

Class	Description
RowSignature	Type signature for a row in a Druid datasource or query result.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.data.input.impl

Class	Description
ColumnType	Native Druid types.
TypeSignature	This interface serves as a common foundation for Druids native type system, and provides common methods for reasoning about and handling type matters.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.data.input.impl.systemfield

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.field

Class	Description
ColumnType	Native Druid types.
RowSignature	Type signature for a row in a Druid datasource or query result.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.key

Class	Description
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.processor

Class	Description
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.
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.read

Class	Description
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.
ColumnType	Native Druid types.
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.read.columnar

Class	Description
BaseColumn
BaseColumnHolder	Specialized holder for BaseColumn (physical column).
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.
ColumnHolder
ColumnIndexSupplier	Provides indexes and information about them (ColumnIndexCapabilities) for a column.
ColumnType	Native Druid types.
SelectableColumn	Class returned by ColumnHolder.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.segment

Class	Description
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.segment.columnar

Class	Description
BaseColumnHolder	Specialized holder for BaseColumn (physical column).
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.
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.segment.row

Class	Description
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.
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.util

Class	Description
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.wire

Class	Description
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.write

Class	Description
ColumnType	Native Druid types.
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.write.cast

Class	Description
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.
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.frame.write.columnar

Class	Description
ColumnCapabilities.Capable
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.java.util.common.io.smoosh

Class	Description
ColumnDescriptor

Classes in org.apache.druid.segment.column used by org.apache.druid.math.expr

Class	Description
BaseTypeSignature
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.
ColumnIndexSupplier	Provides indexes and information about them (ColumnIndexCapabilities) for a column.
ColumnType	Native Druid types.
TypeDescriptor	This is a bridge between ValueType and ExprType, so that they can both be used with TypeSignature.
TypeFactory	Create TypeSignature of a TypeDescriptor.
Types.IncompatibleTypeException
Types.InvalidCastException
TypeSignature	This interface serves as a common foundation for Druids native type system, and provides common methods for reasoning about and handling type matters.
TypeStrategy	TypeStrategy provides value comparison and binary serialization for Druid types.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.math.expr.vector

Class	Description
NullableTypeStrategy	Wrapper of TypeStrategy for nullable types, which stores TypeStrategies.IS_NULL_BYTE or TypeStrategies.IS_NOT_NULL_BYTE in the leading byte of any value, as appropriate.

Classes in org.apache.druid.segment.column used by org.apache.druid.query

Class	Description
ColumnConfig
ColumnType	Native Druid types.
RowSignature	Type signature for a row in a Druid datasource or query result.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation

Class	Description
BaseColumn
ColumnBuilder
ColumnType	Native Druid types.
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.
SelectableColumn	Class returned by ColumnHolder.
TypeStrategy	TypeStrategy provides value comparison and binary serialization for Druid types.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation.any

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation.cardinality

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation.cardinality.types

Class	Description
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation.cardinality.vector

Class	Description
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation.firstlast

Class	Description
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation.firstlast.first

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation.firstlast.last

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation.hyperloglog

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation.mean

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.aggregation.post

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.dimension

Class	Description
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.
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.filter

Class	Description
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.
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.
ColumnType	Native Druid types.
TypeSignature	This interface serves as a common foundation for Druids native type system, and provides common methods for reasoning about and handling type matters.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.filter.vector

Class	Description
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.
ColumnType	Native Druid types.
TypeSignature	This interface serves as a common foundation for Druids native type system, and provides common methods for reasoning about and handling type matters.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.groupby

Class	Description
RowSignature	Type signature for a row in a Druid datasource or query result.
RowSignature.Finalization

Classes in org.apache.druid.segment.column used by org.apache.druid.query.groupby.epinephelinae

Class	Description
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.
RowSignature.Finalization

Classes in org.apache.druid.segment.column used by org.apache.druid.query.groupby.epinephelinae.column

Class	Description
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.
ColumnType	Native Druid types.
NullableTypeStrategy	Wrapper of TypeStrategy for nullable types, which stores TypeStrategies.IS_NULL_BYTE or TypeStrategies.IS_NOT_NULL_BYTE in the leading byte of any value, as appropriate.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.groupby.epinephelinae.vector

Class	Description
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.
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.metadata.metadata

Class	Description
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.
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.operator

Class	Description
RowSignature	Type signature for a row in a Druid datasource or query result.
RowSignature.Finalization

Classes in org.apache.druid.segment.column used by org.apache.druid.query.operator.window.value

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.rowsandcols

Class	Description
ColumnType	Native Druid types.
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.rowsandcols.column

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.rowsandcols.column.accessor

Class	Description
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.rowsandcols.concrete

Class	Description
BaseColumn
BaseColumnHolder	Specialized holder for BaseColumn (physical column).
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.rowsandcols.semantic

Class	Description
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.
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.scan

Class	Description
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.
ColumnType	Native Druid types.
RowSignature	Type signature for a row in a Druid datasource or query result.
RowSignature.Finalization

Classes in org.apache.druid.segment.column used by org.apache.druid.query.timeboundary

Class	Description
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.timeseries

Class	Description
RowSignature	Type signature for a row in a Druid datasource or query result.
RowSignature.Finalization

Classes in org.apache.druid.segment.column used by org.apache.druid.query.topn

Class	Description
ColumnType	Native Druid types.
RowSignature	Type signature for a row in a Druid datasource or query result.
RowSignature.Finalization

Classes in org.apache.druid.segment.column used by org.apache.druid.query.topn.types

Class	Description
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.
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.query.union

Class	Description
RowSignature	Type signature for a row in a Druid datasource or query result.
RowSignature.Finalization

Classes in org.apache.druid.segment.column used by org.apache.druid.segment

Class	Description
BaseColumnHolder	Specialized holder for BaseColumn (physical column).
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.
ColumnConfig
ColumnDescriptor
ColumnFormat	Abstraction for the physical storage components of a column, allowing us to decouple a columns logical type from how it is actually stored in a segment.
ColumnHolder
ColumnIndexSupplier	Provides indexes and information about them (ColumnIndexCapabilities) for a column.
ColumnType	Native Druid types.
RowSignature	Type signature for a row in a Druid datasource or query result.
SelectableColumn	Class returned by ColumnHolder.
StringBitmapIndexType
StringEncodingStrategy
TypeSignature	This interface serves as a common foundation for Druids native type system, and provides common methods for reasoning about and handling type matters.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.column

Class	Description
BaseColumn
BaseColumnHolder	Specialized holder for BaseColumn (physical column).
BaseTypeSignature
BitmapIndexType
BitmapIndexType.DictionaryEncodedValueIndex
BitmapIndexType.NullValueIndex
BitmapIndexType.Writer	Interface to serialize bitmap index.
CapabilitiesBasedFormat	Legacy fallback column format used by columns which do not directly implement ColumnFormat.
ColumnBuilder
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.Capable
ColumnCapabilities.CoercionLogic	This interface defines the shape of a mechanism 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.
ColumnCapabilitiesImpl
ColumnConfig
ColumnDescriptor
ColumnDescriptor.Builder
ColumnFormat	Abstraction for the physical storage components of a column, allowing us to decouple a columns logical type from how it is actually stored in a segment.
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.
ColumnType	Native Druid types.
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
DoublesColumn
FloatsColumn
LongsColumn
NullableTypeStrategy	Wrapper of TypeStrategy for nullable types, which stores TypeStrategies.IS_NULL_BYTE or TypeStrategies.IS_NOT_NULL_BYTE in the leading byte of any value, as appropriate.
NumericColumn
RowSignature	Type signature for a row in a Druid datasource or query result.
RowSignature.Builder
RowSignature.Finalization
SelectableColumn	Class returned by ColumnHolder.
StringBitmapIndexType
StringBitmapIndexType.DictionaryEncodedValueIndex
StringBitmapIndexType.NoIndex
StringEncodingStrategy
StringEncodingStrategy.Utf8
TypeDescriptor	This is a bridge between ValueType and ExprType, so that they can both be used with TypeSignature.
TypeFactory	Create TypeSignature of a TypeDescriptor.
Types.IncompatibleTypeException
TypeSignature	This interface serves as a common foundation for Druids native type system, and provides common methods for reasoning about and handling type matters.
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.NestedDataTypeStrategy
TypeStrategies.StringTypeStrategy	Read and write non-null UTF8 encoded String values.
TypeStrategy	TypeStrategy provides value comparison and binary serialization for Druid types.
UnknownTypeComplexColumn
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.data

Class	Description
StringEncodingStrategy
TypeStrategy	TypeStrategy provides value comparison and binary serialization for Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.file

Class	Description
ColumnDescriptor

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.filter

Class	Description
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.
ColumnType	Native Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.generator

Class	Description
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.incremental

Class	Description
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.
ColumnCapabilitiesImpl
ColumnFormat	Abstraction for the physical storage components of a column, allowing us to decouple a columns logical type from how it is actually stored in a segment.
ColumnType	Native Druid types.
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.index

Class	Description
ColumnIndexCapabilities	Sort of like ColumnCapabilities, except for indexes supplied by ColumnIndexSelector, provides information for how query processing may use indexes.
TypeSignature	This interface serves as a common foundation for Druids native type system, and provides common methods for reasoning about and handling type matters.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.index.semantic

Class	Description
TypeSignature	This interface serves as a common foundation for Druids native type system, and provides common methods for reasoning about and handling type matters.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.join

Class	Description
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.
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.join.filter

Class	Description
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.join.lookup

Class	Description
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.join.table

Class	Description
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.
ColumnType	Native Druid types.
RowSignature	Type signature for a row in a Druid datasource or query result.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.nested

Class	Description
BaseColumn
BaseColumnHolder	Specialized holder for BaseColumn (physical column).
BitmapIndexType
ColumnBuilder
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.
ColumnConfig
ColumnFormat	Abstraction for the physical storage components of a column, allowing us to decouple a columns logical type from how it is actually stored in a segment.
ColumnIndexSupplier	Provides indexes and information about them (ColumnIndexCapabilities) for a column.
ColumnType	Native Druid types.
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
SelectableColumn	Class returned by ColumnHolder.
StringEncodingStrategy
TypeStrategy	TypeStrategy provides value comparison and binary serialization for Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.projections

Class	Description
BaseColumn
BaseColumnHolder	Specialized holder for BaseColumn (physical column).
NumericColumn
SelectableColumn	Class returned by ColumnHolder.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.serde

Class	Description
BaseColumn
BitmapIndexType
ColumnBuilder
ColumnConfig
ColumnHolder
ColumnIndexSupplier	Provides indexes and information about them (ColumnIndexCapabilities) for a column.
ColumnType	Native Druid types.
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
NumericColumn
SelectableColumn	Class returned by ColumnHolder.
StringEncodingStrategy
TypeStrategy	TypeStrategy provides value comparison and binary serialization for Druid types.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.shim

Class	Description
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.
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.vector

Class	Description
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.

Classes in org.apache.druid.segment.column used by org.apache.druid.segment.virtual

Class	Description
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.
ColumnIndexSupplier	Provides indexes and information about them (ColumnIndexCapabilities) for a column.
ColumnType	Native Druid types.
SelectableColumn	Class returned by ColumnHolder.