## Uses of Interface
org.apache.storm.streams.operations.PairFunction

- Packages that use PairFunction
  Package | Description
  --- | ---
  org.apache.storm.sql.runtime.streams.functions |
  org.apache.storm.streams |
  org.apache.storm.streams.operations.mappers |

- - ### Uses of PairFunction in org.apache.storm.sql.runtime.streams.functions

    Classes in org.apache.storm.sql.runtime.streams.functions that implement PairFunction
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `StreamInsertMapToPairFunction` |

  - ### Uses of PairFunction in org.apache.storm.streams

    Methods in org.apache.storm.streams with parameters of type PairFunction
    Modifier and Type | Method | Description
    --- | --- | ---
    `<K,​V> PairStream<K,​V>` | Stream.`mapToPair​(PairFunction<? super T,​? extends K,​? extends V> function)` | Returns a stream of key-value pairs by applying a `PairFunction` on each value of this stream.

  - ### Uses of PairFunction in org.apache.storm.streams.operations.mappers

    Classes in org.apache.storm.streams.operations.mappers that implement PairFunction
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `PairValueMapper<K,​V>` | Extracts a typed key-value pair from a tuple.