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Defining which fields should appear in the output and whether and how they need to be used in matching
This is a JSON array representing the fields from the source data to be used for matching, and the kind of matching they need.
Each field denotes a column from the input. Fields have the following JSON attributes:
The name of the field from the input data schema
To be defined later. For now, please keep this as the fieldName
Type of the column - string, integer, double, etc.
The way to match the given field. Multiple match types, separated by commas, can also be used. Here are the different types supported.