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* the union keys for each side.
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* If spl_ldatum_exists and spl_rdatum_exists are true, then we are performing
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* decisions have already been made about a page split, and the set of tuples
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* being passed to PickSplit is just the tuples about which we are undecided.
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* spl_ldatum/spl_rdatum then contain the union keys for the tuples already
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* keys into account while deciding what to do with the remaining tuples, ie
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* it should try to "build out" from those unions so as to minimally expand
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* them. If it does so, it should union the given tuples' keys into the