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Commit cf627ab4 authored by Tom Lane's avatar Tom Lane
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Further performance improvements in sorting: reduce number of comparisons

during initial run formation by keeping both current run and next-run
tuples in the same heap (yup, Knuth is smarter than I am).  And, during
merge passes, make use of available sort memory to load multiple tuples
from any one input 'tape' at a time, thereby improving locality of
access to the temp file.
parent 2a5f3869
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