Version

    CrossJoin

    Short Description
    Ports
    Metadata
    CrossJoin Attributes
    Details
    Examples
    Best Practices
    Compatibility
    See also

    Short Description

    CrossJoin creates a Cartesian product of records from connected input ports.

    ComponentSame input metadataSorted inputsSlave inputsOutputsOutput for driver without slaveOutput for slaves without driverJoining based on equalityAuto-propagated metadata
    CrossJoin
    no
    no
    		0-n1
    no
    no
    no
    yes

    Ports

    Port typeNumberRequiredDescriptionMetadata
    Input0
    yes
    		Master input portAny1
    1-n
    no
    		Slave input port(s)Any2
    Output0
    yes
    		For output data recordsAny3

    Metadata

    CrossJoin automatically generates metadata on the output port from metadata on its input ports. The generated metadata can be seen as a dynamic template.

    CrossJoin Attributes

    AttributeReqDescriptionPossible values
    Advanced
    Transform[1]A transformation in CTL or Java defined in the graph. 
    Transform URL[1]An external file defining the transformation in CTL or Java. 
    Transform class[1]An external transformation class. 
    Transform source charset Encoding of an external file defining the transformation.e.g. UTF-8

    [1] At most one of these attributes can be set.

    Details

    CrossJoin creates a Cartesian product of input records.

    It works in the following way: the component takes the first record from the first port, the first record from the second port (...) and the first record from the last port and generates the output record. Subsequently, it takes the first record from the first port, the first record from the second port (...) and the second record from the last port. It continues with the third record from the last input port and so on.

    Processing Large Number of Records

    If you process a very large number of records, temporary files with the swapped records may be created on your hard drive. This prevents excessive memory usage.

    Examples

    Simple CrossJoin Example

    Given a list of customers and a list of products of "All on the Store Ltd."

    Customers:

    Brown
Smith
Jones

    Goods:

    Pineapple
Turnip
Spaceship

    Create a list containing all possibilities.

    Solution

    You only need to connect sources of data with CrossJoin component. No setup of attributes of the component is necessary.

    The result is

    Brown|Pineapple
Brown|Turnip
Brown|Spaceship
Smith|Pineapple
Smith|Turnip
Smith|Spaceship
Jones|Pineapple
Jones|Turnip
Jones|Spaceship

    Best Practices

    The edge giving the most records should be connected to the first input port.

    If the transformation is specified in an external file (with Transform URL), we recommend users to explicitly specify Transform source charset.

    Compatibility

    VersionCompatibility Notice
    4.1.0-M1The CrossJoin component is available since 4.1.0-M1.