tBlockedFuzzyJoin properties - 6.1

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Component family

Data Quality

This component is deprecated and hidden from the Palette by default, but it will continue to work in Jobs you import from older releases.

You can use the tRecordMatching component in place.


tBlockedFuzzyJoin joins two tables by doing a fuzzy match on several columns. It compares columns from the main flow with reference columns from the lookup flow and outputs the match data, the possible match data and the rejected data.


Helps ensuring the data quality of any source data against a reference data source.

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.



Built-in: You create and store the schema locally for this component only. Related topic: see Talend Studio User Guide .



Repository: You have already created and stored the schema in the Repository. You can reuse it in other projects and Job designs. Related topic: see Talend Studio User Guide .


Replace output column with lookup column if matches or possible matches

Select this check box to replace the output column with the lookup column in case of match or possible match values.

Key definition

Input key attribute

Select the column(s) from the main flow that needs to be checked against the reference (lookup) key column.


Lookup key attribute

Select the lookup key columns that you will use as a reference against which to compare the columns from the input flow.


Matching type

Select the relevant matching algorithm from the list:

Exact Match: matches each processed entry to all possible reference entries that have exactly the same value.

Levenshtein: Based on the edit distance theory. It calculates the number of insertion, deletion or substitution required for an entry to match the reference entry.

Metaphone: Based on a phonetic algorithm for indexing entries by their pronunciation. It first loads the phonetics of all entries of the lookup reference and checks all entries of the main flow against the entries of the reference flow.

Double Metaphone: a new version of the Metaphone phonetic algorithm, that produces more accurate results than the original algorithm. It can return both a primary and a secondary code for a string. This accounts for some ambiguous cases as well as for multiple variants of surnames with common ancestry.


Case sensitive

Select this check box to consider the letter case.


Min. distance

Only for Levenshtein. Set the minimum number of changes allowed to match the reference. If set to 0, only perfect matches(Exact Match) are returned.


You can create and store context variables for the minimum and maximum distances and then have your Job to loop on these values in order to start from a low max number to match rows and go up to higher max number to match more possible rows. You can press Ctrl+Space to access the variable list and select the new context variables. For more information about context variables, see Talend Studio User Guide.


Max. distance

Only for Levenshtein. Set the maximum number of changes allowed to match the reference.

Advanced settings

tStatCatcher Statistics

Select this check box to collect log data at the 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.

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.


This component is not startable (green background) and it requires two input components and one or more output components.