Package org.apache.drill.exec.record.metadata

Class MapColumnMetadata

java.lang.Object

org.apache.drill.exec.record.metadata.AbstractPropertied

org.apache.drill.exec.record.metadata.AbstractColumnMetadata

org.apache.drill.exec.record.metadata.AbstractMapColumnMetadata

org.apache.drill.exec.record.metadata.MapColumnMetadata

All Implemented Interfaces:

ColumnMetadata, Propertied

public class MapColumnMetadata
extends AbstractMapColumnMetadata

Describes a map and repeated map. Both are tuples that have a tuple schema as part of the column definition.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.drill.exec.record.metadata.ColumnMetadata

ColumnMetadata.StructureType

Field Summary

Fields inherited from class org.apache.drill.exec.record.metadata.AbstractMapColumnMetadata

parentTuple, schema

Fields inherited from class org.apache.drill.exec.record.metadata.AbstractColumnMetadata

mode, name, precision, scale, type

Fields inherited from interface org.apache.drill.exec.record.metadata.ColumnMetadata

BLANK_AS_NULL, BLANK_AS_PROP, BLANK_AS_ZERO, DEFAULT_ARRAY_SIZE, DEFAULT_VALUE_PROP, EXCLUDE_FROM_WILDCARD, EXPECTED_CARDINALITY_PROP, EXPECTED_WIDTH_PROP, FORMAT_PROP, IMPLICIT_COL_TYPE, IMPLICIT_FILENAME, IMPLICIT_FILEPATH, IMPLICIT_FQN, IMPLICIT_PARTITION_PREFIX, IMPLICIT_SUFFIX

Fields inherited from interface org.apache.drill.exec.record.metadata.Propertied

DRILL_PROP_PREFIX

Constructor Summary

Constructors

Constructor	Description
MapColumnMetadata(String name, TypeProtos.DataMode mode, TupleSchema tupleSchema)
MapColumnMetadata(MaterializedField schema)	Build a new map column from the field provided
MapColumnMetadata(MapColumnMetadata from)

Method Summary

Modifier and Type	Method	Description
ColumnMetadata	cloneEmpty()	Create an empty version of this column.
ColumnMetadata	copy()
protected String	internalTypeString()	Returns specific type string representation of the type that extends this class.
boolean	isMap()

Methods inherited from class org.apache.drill.exec.record.metadata.AbstractMapColumnMetadata

appendContents, bind, emptySchema, expectedWidth, isEquivalent, parentTuple, schema, structureType, tupleSchema, typeString

Methods inherited from class org.apache.drill.exec.record.metadata.AbstractColumnMetadata

childSchema, columnString, createColumnMetadata, dateTimeFormatter, decodeDefaultValue, defaultValue, dimensions, equals, equalsWithProperties, equalsWithProperties, escapeSpecialSymbols, expectedElementCount, format, isArray, isDict, isDynamic, isMultiList, isNullable, isScalar, isVariableWidth, isVariant, majorType, mode, name, precision, properties, scale, setDefaultValue, setExpectedElementCount, setExpectedWidth, setFormat, toString, type, valueFromString, valueToString, variantSchema

Methods inherited from class org.apache.drill.exec.record.metadata.AbstractPropertied

booleanProperty, booleanProperty, hashCode, hasProperties, intProperty, intProperty, property, property, removeProperty, setBooleanProperty, setIntProperty, setProperties, setProperty

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.drill.exec.record.metadata.Propertied

booleanProperty, booleanProperty, hasProperties, intProperty, intProperty, property, property, removeProperty, setBooleanProperty, setIntProperty, setProperties, setProperty

Constructor Details

MapColumnMetadata

public MapColumnMetadata(MaterializedField schema)

Build a new map column from the field provided

Parameters:

schema - materialized field description of the map

MapColumnMetadata

public MapColumnMetadata(MapColumnMetadata from)

MapColumnMetadata

public MapColumnMetadata(String name,
 TypeProtos.DataMode mode,
 TupleSchema tupleSchema)

Method Details

copy

public ColumnMetadata copy()

cloneEmpty

public ColumnMetadata cloneEmpty()

Description copied from interface: ColumnMetadata

Create an empty version of this column. If the column is a scalar, produces a simple copy. If a map, produces a clone without child columns.

Returns:

empty clone of this column

isMap

public boolean isMap()

Specified by:

isMap in interface ColumnMetadata

Overrides:

isMap in class AbstractColumnMetadata

internalTypeString

protected String internalTypeString()

Description copied from class: AbstractMapColumnMetadata

Returns specific type string representation of the type that extends this class.

Specified by:

internalTypeString in class AbstractMapColumnMetadata

Returns:

type string representation