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Tom Lane 33dd9bb3b0 Fix behavior of float aggregates for single Inf or NaN inputs. 
When there is just one non-null input value, and it is infinity or NaN,
aggregates such as stddev_pop and covar_pop should produce a NaN
result, because the calculation is not well-defined.  They used to do
so, but since we adopted Youngs-Cramer aggregation in commit e954a727f,
they produced zero instead.  That's an oversight, so fix it.  Add tests
exercising these edge cases.

Affected aggregates are

 var_pop(double precision)
 stddev_pop(double precision)
 var_pop(real)
 stddev_pop(real)
 regr_sxx(double precision,double precision)
 regr_syy(double precision,double precision)
 regr_sxy(double precision,double precision)
 regr_r2(double precision,double precision)
 regr_slope(double precision,double precision)
 regr_intercept(double precision,double precision)
 covar_pop(double precision,double precision)
 corr(double precision,double precision)

Back-patch to v12 where the behavior change was accidentally introduced.

Report and patch by me; thanks to Dean Rasheed for review.

Discussion: https://postgr.es/m/353062.1591898766@sss.pgh.pa.us
2020-06-13 13:43:40 -04:00
config Update config.guess and config.sub 2020-04-30 09:06:49 +02:00
contrib Spelling adjustments 2020-06-09 10:42:28 +02:00
doc doc: remove xreflabels used in PG 13 relnotes 2020-06-11 18:27:59 -04:00
src Fix behavior of float aggregates for single Inf or NaN inputs. 2020-06-13 13:43:40 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
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aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
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README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.