tExternalSortRow – Docs for ESB 5.x

Component family

Processing

Function

Uses an external sort application to sort input data based on one
or several columns, by sort type and order

Purpose

Helps create metrics and classification table.

Basic settings

Schema and Edit
Schema

A schema is a row description, it defines the number of fields to be processed and
passed on to the next component. The schema is either Built-in or stored remotely in the
Repository.

Since version 5.6, both the Built-In mode and the Repository mode are
available in any of the Talend solutions.

Click Edit schema to make changes to the schema. If the
current schema is of the Repository type, three options are
available:

Click Sync columns to retrieve
the schema from the previous component connected in the Job.

Built-in: The schema will be
created and stored locally for this component only. Related topic:
see Talend Studio User Guide.

Repository: The schema already
exists and is stored in the Repository, hence can be reused in
various projects and Job flowcharts. Related topic: see
Talend Studio User
Guide.

File Name

Name or path to the file to be processed and/or the variable to be
used.

For further information about how to define and use a variable in
a Job, see Talend Studio
User Guide.

Field separator

Character, string or regular expression to separate fields.

External command “sort” path

Enter the path to the external file containing the sorting
algorithm to use.

Criteria

Click the plus button to add as many lines as required for the
sort to be complete. By default the first column defined in your
schema is selected.

Schema column: Select the column
label from your schema, which the sort will be based on. Note that
the order is essential as it determines the sorting priority.

Sort type: Numerical and
Alphabetical order are proposed. More sorting types to come.

Order: Ascending or descending
order.

Advanced settings

Maximum memory

Type in the size of physical memory you want to allocate to sort
processing.

Temporary directory

Specify the temporary directory to process the sorting
command.

Set temporary input file directory

Select the check box to activate the field in which you can
specify the directory to handle your temporary input file.

Add a dummy EOF line

Select this check box when using the tAggregateSortedRow component.

tStatCatcher Statistics

Select this check box to gather the Job processing metadata at the
Job level as well as at each component level.

Global Variables

ERROR_MESSAGE: the error message generated by the
component when an error occurs. This is an After variable and it returns a string. This
variable functions only if the Die on error check box is
cleared, if the component has this check box.

NB_LINE: the number of rows read by an input component or
transferred to an output component. This is an After variable and it returns an
integer.

A Flow variable functions during the execution of a component while an After variable
functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl +
Space to access the variable list and choose the variable to use from it.

For further information about variables, see Talend Studio
User Guide.

Usage

This component handles flow of data therefore it requires input
and output, hence is defined as an intermediary step.

Limitation

n/a