Big Data Management User Guide

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Creating A Nested Complex Port

Use the

Create Nested Complex Port

wizard to convert data that passes through one or more ports in two transformations to a struct data that references a nested data type definition. You specify the transformations from which the wizard creates the parent and child complex data type definitions.

Open the mapping or mapplet in which you want to create a nested complex port.

Press Ctrl and select the ports in the two transformations that you want to convert as elements of the nested complex port.

The mapping contains two Read transformations and two Expression transformations. The Read transformations contain ports that pass employee and bank details. The Expression transformation shows the selected ports from which you want to create nested complex port.

Right-click the selected ports, and select

Hierarchical Conversions

Create Nested Complex Port

The

Create Nested Complex Port

wizard appears.

The first page of the wizard contains the name of the transformations from which you selected the ports. You must choose the parent transformation and select the parent and child key. The first transformation is selected as the parent transformation by default. The first port in each transformation is selected as the join key by default.

Choose the transformation that contains ports for the parent complex data type definition and select the join keys to join the tables.

The image shows the second transformation as the parent transformation. The first port in each transformation is selected as the join key by default.

Click

The wizard page to create child complex data type definition appears.

The second page of the wizard shows a default name for the child complex data type definition. The page also displays the ports that will be added as the elements of the complex data type definition.

Optionally, change the name of the child complex data type definition and make any changes to the elements.

The image shows the changed name of the child complex data type definition and the list of elements to be added.

Click

The wizard page to select group by port from the parent transformation appears.

Click

Choose

The

Ports

dialog box appears.

Select a group by port from the parent transformation and click

The selected port appears on the wizard page.

The page displays the group by port that you selected.

Click

The final wizard page to create parent complex data type definition and nested complex port appears.

The last page of the wizard shows a default name for the parent complex data type definition. The page also displays the ports that will be added as the elements of the complex data type definition.

Optionally, change the name of the parent complex data type definition and make any changes to the elements.

You cannot delete the port that you selected as the group by port.

The image shows the changed name of the parent complex data type definition and the list of elements to be added.

Click

Finish

You can see the following changes in the mapping:

The mapping contains a new Joiner transformation

Join_<transformation1>_<transformation1>

that joins the two tables.

The Joiner transformation shows the ports in the output, master, and detail groups. The output group contains the joined ports from the two transformations.

The mapping contains a new Expression transformation

Create_ChildStruct

with a struct output port and a dynamic port with ports from the upstream transformation.

The Expression transformation contains a struct output port and a dynamic port.

The type definition library contains the new child complex data type definition. The struct output port references the child complex data type definition.

The image shows a child complex data type definition that contains four elements. Two elements are of type integer and two elements are of type string.

The output port contains an expression with the STRUCT_AS function:

STRUCT_AS(:Type.Type_Definition_Library.<child_typedef>,<comma_delimited_child_elements>)

The mapping contains a new Aggregator transformation

Agg_ArrayOfStruct

with the group by port to group the child structs into an array.

The Aggregator transformation contains an array output port and a dynamic port.

The mapping contains a new Expression transformation

Final_NestedComplexPort

with a struct output port and a dynamic port with ports from the upstream transformation.

The final Expression transformation contains the nested struct port and a dynamic port.

The type definition library contains the new parent complex data type definition, which is a nested data type definition. The struct output port references the parent complex data type definition.

The nested data type definition shows the child and parent complex data type definitions.

The output port contains an expression with the STRUCT_AS function:

STRUCT_AS(:Type.Type_Definition_Library.<parent_typedef>,<comma_delimited_struct_elements>)

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Table of Contents

Big Data Management User Guide

Big Data Management User Guide

Creating A Nested Complex Port

Creating A Nested Complex Port