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Historically guc.c has just refused examples like set work_mem = '30.1GB', but it seems more useful for it to take that and round off the value to some reasonable approximation of what the user said. Just rounding to the parameter's native unit would work, but it would lead to rather silly-looking settings, such as 31562138kB for this example. Instead let's round to the nearest multiple of the next smaller unit (if any), producing 30822MB. Also, do the units conversion math in floating point and round to integer (if needed) only at the end. This produces saner results for inputs that aren't exact multiples of the parameter's native unit, and removes another difference in the behavior for integer vs. float parameters. In passing, document the ability to use hex or octal input where it ought to be documented. Discussion: https://postgr.es/m/1798.1552165479@sss.pgh.pa.us
PostgreSQL tests ================ This directory contains a variety of test infrastructure as well as some of the tests in PostgreSQL. Not all tests are here -- in particular, there are more in individual contrib/ modules and in src/bin. Not all these tests get run by "make check". Check src/test/Makefile to see which tests get run automatically. authentication/ Tests for authentication examples/ Demonstration programs for libpq that double as regression tests via "make check" isolation/ Tests for concurrent behavior at the SQL level locale/ Sanity checks for locale data, encodings, etc mb/ Tests for multibyte encoding (UTF-8) support modules/ Extensions used only or mainly for test purposes, generally not suitable for installing in production databases perl/ Infrastructure for Perl-based TAP tests recovery/ Test suite for recovery and replication regress/ PostgreSQL's main regression test suite, pg_regress ssl/ Tests to exercise and verify SSL certificate handling subscription/ Tests for logical replication thread/ A thread-safety-testing utility used by configure