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* Internal routine to fetch the next tuple in either forward or back
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*direction into *stup.Returnsfalse if no more tuples.
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* Internal routine to fetch the nextindextuple in either forward or back direction.
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* ReturnsNULL if no more tuples. Returned tuple belongs to tuplesort memory context. Caller may not rely on tuple remaining valid after any further manipulation of tuplesort.
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* If *should_free is set, the caller must pfree stup.tuple when done with it.
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*
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* NOTE: in PG 10 and newertuplesort_gettuple_common allocatestuple in tuplesort
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*context and itshould not be freed by caller.
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* NOTE: in PG 10 and newertuple is always allocatedtuple in tuplesort context and