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Tom Lane ea1268f630 Avoid generating extra subre tree nodes for capturing parentheses. ... Previously, each pair of capturing parentheses gave rise to a separate subre tree node, whose only function was to identify that we ought to capture the match details for this particular sub-expression. In most cases we don't really need that, since we can perfectly well put a "capture this" annotation on the child node that does the real matching work. As with the two preceding commits, the main value of this is to avoid generating and optimizing an NFA for a tree node that's not really pulling its weight. The chosen data representation only allows one capture annotation per subre node. In the legal-per-spec, but seemingly not very useful, case where there are multiple capturing parens around the exact same bit of the regex (i.e. "((xyz))"), wrap the child node in N-1 capture nodes that act the same as before. We could work harder at that but I'll refrain, pending some evidence that such cases are worth troubling over. In passing, improve the comments in regex.h to say what all the different re_info bits mean. Some of them were pretty obvious but others not so much, so reverse-engineer some documentation. This is part of a patch series that in total reduces the regex engine's runtime by about a factor of four on a large corpus of real-world regexes. Patch by me, reviewed by Joel Jacobson Discussion: https://postgr.es/m/1340281.1613018383@sss.pgh.pa.us		5 years ago
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backend	Avoid generating extra subre tree nodes for capturing parentheses.	5 years ago
bin	Fix psql's ON_ERROR_ROLLBACK so that it handles COMMIT AND CHAIN.	5 years ago
common	Add result size as argument of pg_cryptohash_final() for overflow checks	5 years ago
fe_utils	Generalize parallel slot result handling.	5 years ago
include	Avoid generating extra subre tree nodes for capturing parentheses.	5 years ago
interfaces	Allow specifying CRL directory	5 years ago
makefiles	Remove libpq.rc, use win32ver.rc for libpq	6 years ago
pl	Remove extra increment of plpgsql's statement counter for FOR loops.	5 years ago
port	pg_attribute_no_sanitize_alignment() macro	5 years ago
template	Further tweaking of PG_SYSROOT heuristics for macOS.	5 years ago
test	Fix bug in COMMIT AND CHAIN command.	5 years ago
timezone	Update time zone data files to tzdata release 2021a.	5 years ago
tools	Allow multiple xacts during table sync in logical replication.	5 years ago
tutorial	Doc, more or less: uncomment tutorial example that was fixed long ago.	5 years ago
.gitignore	…
DEVELOPERS	…
Makefile	Remove the option to build thread_test.c outside configure.	5 years ago
Makefile.global.in	Introduce --with-ssl={openssl} as a configure option	5 years ago
Makefile.shlib	Add PostgreSQL home page to --help output	6 years ago
nls-global.mk	NLS: Fix backend gettext triggers	6 years ago