org.apache.druid.segment.join.table

Class RowBasedIndexBuilder

java.lang.Object

org.apache.druid.segment.join.table.RowBasedIndexBuilder

public class RowBasedIndexBuilder
extends Object

Utility class for creating IndexedTable.Index instances. Its main role is to decide which kind of implementation to use.

Constructor Summary

Constructors

Constructor and Description
RowBasedIndexBuilder(ValueType keyType)

Method Summary

Modifier and Type	Method and Description
RowBasedIndexBuilder	add(Object key) Add a key to the index.
IndexedTable.Index	build() Create the index.

Methods inherited from class java.lang.Object

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

Constructor Detail

RowBasedIndexBuilder

public RowBasedIndexBuilder(ValueType keyType)

Method Detail

add

public RowBasedIndexBuilder add(@Nullable
                                Object key)

Add a key to the index. This must be called exactly once per row, even for null values or values that are the wrong type, because the builder keeps an internal row-number counter. The builder will handle both nulls and mismatched types, so callers do not need to worry about this.

build

public IndexedTable.Index build()

Create the index. After calling this, the state of the builder is undefined, and you should discard it.