org.apache.drill.exec.record.metadata

Class RepeatedListBuilder

java.lang.Object

org.apache.drill.exec.record.metadata.RepeatedListBuilder

public class RepeatedListBuilder
extends Object

Builder for a repeated list. Drill's metadata represents a repeated list as a chain of materialized fields and that is the pattern used here. It would certainly be cleaner to have a single field, with the number of dimensions as a property, but that is not how Drill evolved.

An instance can be created with and without parent container. In the first case, a column is added to the parent container during creation and all resumeXXX methods return qualified parent container. In the second case column is created without parent container as a stand-alone entity. The resumeXXX methods do not produce any action and return null. To access built column buildColumn() should be used.

Constructor Summary

Constructors

Constructor and Description
RepeatedListBuilder(org.apache.drill.exec.record.metadata.SchemaContainer parent, String name)
RepeatedListBuilder(String name)

Method Summary

Modifier and Type	Method and Description
RepeatedListBuilder	addArray(TypeProtos.MinorType type)
RepeatedListBuilder	addArray(TypeProtos.MinorType type, int width)
RepeatedListBuilder	addArray(TypeProtos.MinorType type, int precision, int scale)
void	addColumn(ColumnMetadata column)
DictBuilder	addDictArray()
RepeatedListBuilder	addDimension()
UnionBuilder	addList()
MapBuilder	addMapArray()
void	build()
RepeatedListColumnMetadata	buildColumn()
DictBuilder	resumeDict()
RepeatedListBuilder	resumeList()
MapBuilder	resumeMap()
SchemaBuilder	resumeSchema()
UnionBuilder	resumeUnion()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RepeatedListBuilder

public RepeatedListBuilder(String name)

RepeatedListBuilder

public RepeatedListBuilder(org.apache.drill.exec.record.metadata.SchemaContainer parent,
                           String name)

Method Detail

addDimension

public RepeatedListBuilder addDimension()

addMapArray

public MapBuilder addMapArray()

addDictArray

public DictBuilder addDictArray()

addArray

public RepeatedListBuilder addArray(TypeProtos.MinorType type)

addArray

public RepeatedListBuilder addArray(TypeProtos.MinorType type,
                                    int width)

addArray

public RepeatedListBuilder addArray(TypeProtos.MinorType type,
                                    int precision,
                                    int scale)

addList

public UnionBuilder addList()

buildColumn

public RepeatedListColumnMetadata buildColumn()

build

public void build()

resumeList

public RepeatedListBuilder resumeList()

resumeSchema

public SchemaBuilder resumeSchema()

resumeUnion

public UnionBuilder resumeUnion()

resumeMap

public MapBuilder resumeMap()

resumeDict

public DictBuilder resumeDict()

addColumn

public void addColumn(ColumnMetadata column)