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How does JR determine which key to use.

Hi,

I'm frequently confused by the key choice of Jetreports(JR). When for instance, I do a row lookup with filters on 3 specific fields, sometimes JR will choose to use a key in which only field3 is included while there is a key that covers both field1 and field2 which would be the most logical key to use performance wise. Only after switching the order of the keys, trial and error wise, I seem to be able to get it to pick the correct key.

What is the rule JR uses to determine which key to use?

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