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Backpatch-through: certain files through 9.4
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Backpatch-through: certain files through 9.3
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It's buggy. If somebody needs this later, they'll need to put back
a non-buggy vesion of it.
Discussion: CAM3SWZT-i6R9JU5YXa8MJUou2_r3LfGJZpQ9tYa1BYxfkj0=cQ@mail.gmail.com
Discussion: CAM3SWZRUOLsYoTT83QgdUy9D8ehYWm_nvbrrfcOOzikiRfFY7g@mail.gmail.com
Peter Geoghegan
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New functions initHyperLogLogError() and freeHyperLogLog() simplify
using this module from elsewhere.
Author: Tomáš Vondra
Review: Peter Geoghegan
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Backpatch certain files through 9.1
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MSVC generates a warning here; we hope this will make it happy.
Report by Michael Paquier. Patch by David Rowley.
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This commit extends the SortSupport infrastructure to allow operator
classes the option to provide abbreviated representations of Datums;
in the case of text, we abbreviate by taking the first few characters
of the strxfrm() blob. If the abbreviated comparison is insufficent
to resolve the comparison, we fall back on the normal comparator.
This can be much faster than the old way of doing sorting if the
first few bytes of the string are usually sufficient to resolve the
comparison.
There is the potential for a performance regression if all of the
strings to be sorted are identical for the first 8+ characters and
differ only in later positions; therefore, the SortSupport machinery
now provides an infrastructure to abort the use of abbreviation if
it appears that abbreviation is producing comparatively few distinct
keys. HyperLogLog, a streaming cardinality estimator, is included in
this commit and used to make that determination for text.
Peter Geoghegan, reviewed by me.
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