tGenKey Standard properties
These properties are used to configure tGenKey running in the Standard Job framework.
The Standard tGenKey component belongs to the Data Quality family.
The component in this framework is available in Talend Data Management Platform, Talend Big Data Platform, Talend Real-Time Big Data Platform, Talend Data Services Platform, and in Talend Data Fabric.
Basic settings
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Schema and Edit schema |
A schema is a row description. It defines the number of fields (columns) to be processed and passed on to the next component. When you create a Spark Job, avoid the reserved word line when naming the fields. Click Sync columns to retrieve the schema from the previous component connected in the Job. |
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Built-In: You create and store the schema locally for this component only. |
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Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job designs. |
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Click the import icon to import blocking keys from the match rules that are defined and saved in the Talend Studio repository. When you click the import icon, a Match Rule Selector wizard is opened to help you import blocking keys from the match rules listed in the Talend Studio repository and use them in your Job. You can import blocking keys only from match rules that are defined with the VSR algorithm and saved in the Talend Studio repository. For further information, see Importing match rules from the Talend Studio repository |
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Column |
Select the columns from the main flow on which you want to define certain algorithms to set the functional key. Information noteNote: When you select a date column on which to apply an algorithm or a matching
algorithm, you can decide what to compare in the date format.
For example, if you want to only compare the year in the date, in the component schema set the type of the date column to Date and then enter "yyyy" in the Date Pattern field. The component then converts the date format to a string according to the pattern defined in the schema before starting a string comparison. |
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Pre-Algorithm |
If required, select the relevant matching algorithm from the list: Remove diacritical marks: removes any diacritical mark. Remove diacritical marks and lower case: removes any diacritical mark and converts to lower case before generating the code of the column. Remove diacritical marks and upper case: removes any diacritical mark and converts to upper case before generating the code of the column. Lower case: converts the field to lower case before applying the key algorithm. Upper case: converts the field to upper case before applying the key algorithm. Add left position character: enables you to add a character to the left of the column. Add right position character: enables you to add a character to the right of the column. |
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Value |
Set the algorithm value, where applicable. |
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Algorithm |
Select the relevant algorithm from the list: First character of each word: includes in the functional key the first character of each word in the column. When using Japanese characters in the input data, the input text should be tokenized. For more information, see tJapaneseTokenize. First N characters of each word: includes in the functional key first N characters of each word in the column. When using Japanese characters in the input data, the input text should be tokenized. For more information, see tJapaneseTokenize. First N characters of the string: includes in the functional key first N characters of the string. Last N characters of the string: includes in the functional key last N characters of the string. First N consonants of the string: includes in the functional key first N consonants of the string. Japanese and Chinese characters are not supported. First N vowels of the string: includes in the functional key first N vowels of the string. Japanese and Chinese characters are not supported. Pick characters: includes in the functional key the characters located at a fixed position (corresponding to the set digital/range). Exact: includes in the functional key the full string. Substring(a,b): includes in the functional key character according to the set index. Soundex code: generates a code according to a standard English phonetic algorithm. This code represents the character string that will be included in the functional key. Japanese and Chinese characters are not supported. Metaphone code: generates a code according to the character pronunciation. This code represents the character string that will be included in the functional key. Japanese and Chinese characters are not supported. Double-metaphone code: generates a code according to the character pronunciation using a new version of the Metaphone phonetic algorithm, that produces more accurate results than the original algorithm. This code represents the character string that will be included in the functional key. Japanese and Chinese characters are not supported.
Fingerprint key: generates the functional key from a
string value through the following sequential process:
nGramkey: this algorithm is similar to the fingerPrintkey method described above. But instead of using
whitespace separated tokens, it uses n-grams, where the n can be
specified by the user. This method generates the functional key from a string value through
the following sequential process:
Information noteNote:
If the column on which you want to use the nGramkey algorithm can have data, with only 0 or 1 characters, you must filter this data before generating the functional key. This way you avoid potentially comparing records to each other that should not be match candidates. Cologne phonetics: a Soundex phonetic algorithm optimized for the German language. It encodes a string into a Cologne phonetic value. This code represents the character string that will be included in the functional key. Japanese and Chinese characters are not supported. |
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Value |
Set the algorithm value, where applicable. If you do not set a value for the algorithms which need one, the Job runs with a compilation error. |
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Post-Algorithm |
If required, select the relevant matching algorithm from the list: Use default value (string): enables you to choose a string to replace null or empty data. Add left position character: enables you to add a character to the left of the column. Add right position character: enables you to add a character to the right of the column. |
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Value |
Set the option value, where applicable. |
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Show help |
Select this check box to display instructions on how to set algorithms/options parameters. |
Advanced settings
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tStat Catcher Statistics |
Select this check box to gather the Job processing metadata at the Job level as well as at each component level. Note that this check box is not available in the Map/Reduce version of the component. |
Global Variables
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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 more information about variables, see Using contexts and variables. |
Usage
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Usage rule |
This component is usually used as an intermediate component, and it requires an input component and an output component. This component can be used with other components, such as tMatchGroup, in order to create a blocking key. |