In the SQL Creator transformer, what is meant by 'attributes to expose'. When do I need to use it? For example if I have a query which extracts fields, wouldn't the attributes be exposed from the query itself.
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No, the SQLCreator and the SQLExecutor don't expose the attributes by themselves. You have to use the 'attributes to expose' parameter.
In that parameter you have a button that can import the attribute names from the SQL sentence you have written.