Choose the best access path for this Optimizable.
@param optimizer Optimizer to use.
@param predList The predicate list to optimize against
@param outerCost The CostEstimate for the outer tables in the join order,telling how many times this Optimizable will be scanned.
@param rowOrdering The row ordering for all the tables in thejoin order, including this one.
@return The optimizer's estimated cost of the best access path.
@exception StandardException Thrown on error
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