Package org.apache.druid.query.rowsandcols

Class AppendableMapOfColumns

java.lang.Object

org.apache.druid.query.rowsandcols.AppendableMapOfColumns

All Implemented Interfaces:

RowsAndColumns, AppendableRowsAndColumns

public class AppendableMapOfColumns
extends Object
implements AppendableRowsAndColumns

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.druid.query.rowsandcols.RowsAndColumns

RowsAndColumns.RowsAndColumnsDeserializer, RowsAndColumns.RowsAndColumnsSerializer

Constructor Summary

Constructors

Constructor	Description
AppendableMapOfColumns(RowsAndColumns base)

Method Summary

Modifier and Type	Method	Description
void	addColumn(String name, Column column)	Mutates the RowsAndColumns by appending the requested Column.
Column	findColumn(String name)	Finds a column by name.
Collection<String>	getColumnNames()	The set of column names available from the RowsAndColumns
int	numRows()	The number of rows in the RowsAndColumns object

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.query.rowsandcols.RowsAndColumns

as

Constructor Details

AppendableMapOfColumns

public AppendableMapOfColumns(RowsAndColumns base)

Method Details

addColumn

public void addColumn(String name,
 Column column)

Description copied from interface: AppendableRowsAndColumns

Mutates the RowsAndColumns by appending the requested Column.

Specified by:

addColumn in interface AppendableRowsAndColumns

Parameters:

name - the name of the new column

column - the Column object representing the new column

getColumnNames

public Collection<String> getColumnNames()

Description copied from interface: RowsAndColumns

The set of column names available from the RowsAndColumns

Specified by:

getColumnNames in interface RowsAndColumns

Returns:

The set of column names available from the RowsAndColumns

numRows

public int numRows()

Description copied from interface: RowsAndColumns

The number of rows in the RowsAndColumns object

Specified by:

numRows in interface RowsAndColumns

Returns:

the integer number of rows

findColumn

public Column findColumn(String name)

Description copied from interface: RowsAndColumns

Finds a column by name. null is returned if the column is not found. The RowsAndColumns object should not attempt to default not-found columns to pretend as if they exist, instead the user of the RowsAndColumns object should decide the correct semantic interpretation of a column that does not exist. It is expected that most locations will choose to believe that the column does exist and is always null, but there are often optimizations that can effect this same assumption without doing a lot of extra work if the calling code knows that it does not exist.

Specified by:

findColumn in interface RowsAndColumns

Parameters:

name - the name of the column to find

Returns:

the Column, if found. null if not found.