org.apache.drill.exec.physical.resultSet.model

Class BaseTupleModel

java.lang.Object

org.apache.drill.exec.physical.resultSet.model.BaseTupleModel

All Implemented Interfaces:

TupleModel

public abstract class BaseTupleModel
extends Object
implements TupleModel

Base implementation for a tuple model which is common to the "single" and "hyper" cases. Deals primarily with the structure of the model, which is common between the two physical implementations.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BaseTupleModel.BaseColumnModel

Nested classes/interfaces inherited from interface org.apache.drill.exec.physical.resultSet.model.TupleModel

TupleModel.ColumnModel, TupleModel.RowSetModel

Field Summary

Fields

Modifier and Type	Field and Description
protected List<TupleModel.ColumnModel>	columns Columns within the tuple.
protected TupleMetadata	schema Descriptive schema associated with the columns above.

Constructor Summary

Constructors

Constructor and Description
BaseTupleModel()
BaseTupleModel(TupleMetadata schema, List<TupleModel.ColumnModel> columns)

Method Summary

Modifier and Type	Method and Description
protected void	addBaseColumn(BaseTupleModel.BaseColumnModel column) Perform the work of keeping the list of columns and schema in-sync as columns are added.
TupleModel.ColumnModel	column(int index)
TupleModel.ColumnModel	column(String name)
TupleMetadata	schema()
int	size()

Methods inherited from class java.lang.Object

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

Field Detail

columns

protected final List<TupleModel.ColumnModel> columns

Columns within the tuple. Columns may, themselves, be represented as tuples.

schema

protected final TupleMetadata schema

Descriptive schema associated with the columns above. Unlike a VectorContainer, this abstraction keeps the schema in sync with vectors as columns are added.

Constructor Detail

BaseTupleModel

public BaseTupleModel()

BaseTupleModel

public BaseTupleModel(TupleMetadata schema,
                      List<TupleModel.ColumnModel> columns)

Method Detail

schema

public TupleMetadata schema()

Specified by:

schema in interface TupleModel

size

public int size()

Specified by:

size in interface TupleModel

column

public TupleModel.ColumnModel column(int index)

Specified by:

column in interface TupleModel

column

public TupleModel.ColumnModel column(String name)

Specified by:

column in interface TupleModel

addBaseColumn

protected void addBaseColumn(BaseTupleModel.BaseColumnModel column)

Perform the work of keeping the list of columns and schema in-sync as columns are added. This is protected because derived classes must add logic to keep the new column in sync with the underlying container or map vector.

Parameters:

column - column implementation to add