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Andrew Gierth 02ddd49932 Change floating-point output format for improved performance. ... Previously, floating-point output was done by rounding to a specific decimal precision; by default, to 6 or 15 decimal digits (losing information) or as requested using extra_float_digits. Drivers that wanted exact float values, and applications like pg_dump that must preserve values exactly, set extra_float_digits=3 (or sometimes 2 for historical reasons, though this isn't enough for float4). Unfortunately, decimal rounded output is slow enough to become a noticable bottleneck when dealing with large result sets or COPY of large tables when many floating-point values are involved. Floating-point output can be done much faster when the output is not rounded to a specific decimal length, but rather is chosen as the shortest decimal representation that is closer to the original float value than to any other value representable in the same precision. The recently published Ryu algorithm by Ulf Adams is both relatively simple and remarkably fast. Accordingly, change float4out/float8out to output shortest decimal representations if extra_float_digits is greater than 0, and make that the new default. Applications that need rounded output can set extra_float_digits back to 0 or below, and take the resulting performance hit. We make one concession to portability for systems with buggy floating-point input: we do not output decimal values that fall exactly halfway between adjacent representable binary values (which would rely on the reader doing round-to-nearest-even correctly). This is known to be a problem at least for VS2013 on Windows. Our version of the Ryu code originates from https://github.com/ulfjack/ryu/ at commit c9c3fb1979, but with the following (significant) modifications: - Output format is changed to use fixed-point notation for small exponents, as printf would, and also to use lowercase 'e', a minimum of 2 exponent digits, and a mandatory sign on the exponent, to keep the formatting as close as possible to previous output. - The output of exact midpoint values is disabled as noted above. - The integer fast-path code is changed somewhat (since we have fixed-point output and the upstream did not). - Our project style has been largely applied to the code with the exception of C99 declaration-after-statement, which has been retained as an exception to our present policy. - Most of upstream's debugging and conditionals are removed, and we use our own configure tests to determine things like uint128 availability. Changing the float output format obviously affects a number of regression tests. This patch uses an explicit setting of extra_float_digits=0 for test output that is not expected to be exactly reproducible (e.g. due to numerical instability or differing algorithms for transcendental functions). Conversions from floats to numeric are unchanged by this patch. These may appear in index expressions and it is not yet clear whether any change should be made, so that can be left for another day. This patch assumes that the only supported floating point format is now IEEE format, and the documentation is updated to reflect that. Code by me, adapting the work of Ulf Adams and other contributors. References: https://dl.acm.org/citation.cfm?id=3192369 Reviewed-by: Tom Lane, Andres Freund, Donald Dong Discussion: https://postgr.es/m/87r2el1bx6.fsf@news-spur.riddles.org.uk		6 years ago
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bit.out	Remove ruleutils.c's special case for BIT [VARYING] literals.	7 years ago
bytea.out	Add index-only scan support to btree_gist.	10 years ago
cash.out	Remove WITH OIDS support, change oid catalog column visibility.	7 years ago
char.out	Add index-only scan support to btree_gist.	10 years ago
char_1.out	Add index-only scan support to btree_gist.	10 years ago
cidr.out	…
date.out	Add index-only scan support to btree_gist.	10 years ago
enum.out	Add btree_gist support for enum types.	8 years ago
float4.out	Change floating-point output format for improved performance.	6 years ago
float8.out	Change floating-point output format for improved performance.	6 years ago
inet.out	Improve stability of recently-added regression test case.	7 years ago
init.out	Test all contrib-created operator classes with amvalidate.	9 years ago
int2.out	Be more careful about printing constants in ruleutils.c.	10 years ago
int4.out	Add index-only scan support to btree_gist.	10 years ago
int8.out	Be more careful about printing constants in ruleutils.c.	10 years ago
interval.out	Properly initialize SortSupport for ORDER BY rechecks in nodeIndexscan.c.	9 years ago
macaddr.out	Add index-only scan support to btree_gist.	10 years ago
macaddr8.out	Add support for EUI-64 MAC addresses as macaddr8	8 years ago
not_equal.out	Ensure plan stability in contrib/btree_gist regression test.	9 years ago
numeric.out	Be more careful about printing constants in ruleutils.c.	10 years ago
oid.out	Remove WITH OIDS support, change oid catalog column visibility.	7 years ago
text.out	Add index-only scan support to btree_gist.	10 years ago
text_1.out	Add index-only scan support to btree_gist.	10 years ago
time.out	Add index-only scan support to btree_gist.	10 years ago
timestamp.out	Add index-only scan support to btree_gist.	10 years ago
timestamptz.out	Add index-only scan support to btree_gist.	10 years ago
timetz.out	…
uuid.out	Add uuid to the set of types supported by contrib/btree_gist.	9 years ago
varbit.out	Remove ruleutils.c's special case for BIT [VARYING] literals.	7 years ago
varchar.out	Fixes from Janko Richter <jankorichter@yahoo.de>	20 years ago
varchar_1.out	Add alternative expected output files for cs_CZ locale for btree_gist and	16 years ago