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6cfaffc0dd
postgresql/contrib/pg_trgm
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Tom Lane 6cfaffc0dd Fix regexport.c to behave sanely with lookaround constraints. 
regexport.c thought it could just ignore LACON arcs, but the correct
behavior is to treat them as satisfiable while consuming zero input
(rather reminiscently of commit 9f1e642d5).  Otherwise, the emitted
simplified-NFA representation may contain no paths leading from initial
to final state, which unsurprisingly confuses pg_trgm, as seen in
bug #14623 from Jeff Janes.

Since regexport's output representation has no concept of an arc that
consumes zero input, recurse internally to find the next normal arc(s)
after any LACON transitions.  We'd be forced into changing that
representation if a LACON could be the last arc reaching the final
state, but fortunately the regex library never builds NFAs with such
a configuration, so there always is a next normal arc.

Back-patch to 9.3 where this logic was introduced.

Discussion: https://postgr.es/m/20170413180503.25948.94871@wrigleys.postgresql.org
2017-04-13 17:18:35 -04:00
..
data Add files forgotten in f576b17cd6 2016-03-16 19:23:41 +03:00
expected Fix regexport.c to behave sanely with lookaround constraints. 2017-04-13 17:18:35 -04:00
sql Fix regexport.c to behave sanely with lookaround constraints. 2017-04-13 17:18:35 -04:00
.gitignore Support "make check" in contrib 2011-04-25 22:27:11 +03:00
Makefile Handle contrib's GIN/GIST support function signature changes honestly. 2016-06-09 16:44:25 -04:00
pg_trgm--1.0--1.1.sql Fix typo in update scripts for some contrib modules. 2013-07-19 04:13:01 +09:00
pg_trgm--1.1--1.2.sql Add word_similarity to pg_trgm contrib module. 2016-03-16 18:59:21 +03:00
pg_trgm--1.2--1.3.sql pg_trgm's set_limit() function is parallel unsafe, not parallel restricted. 2016-06-20 11:29:54 -04:00
pg_trgm--1.3.sql pg_trgm's set_limit() function is parallel unsafe, not parallel restricted. 2016-06-20 11:29:54 -04:00
pg_trgm--unpackaged--1.0.sql Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:37 +02:00
pg_trgm.control Handle contrib's GIN/GIST support function signature changes honestly. 2016-06-09 16:44:25 -04:00
trgm_gin.c Use wrappers of PG_DETOAST_DATUM_PACKED() more. 2017-03-12 19:35:34 -04:00
trgm_gist.c Use wrappers of PG_DETOAST_DATUM_PACKED() more. 2017-03-12 19:35:34 -04:00
trgm_op.c Use wrappers of PG_DETOAST_DATUM_PACKED() more. 2017-03-12 19:35:34 -04:00
trgm_regexp.c Fix contrib/pg_trgm's extraction of trigrams from regular expressions. 2017-02-22 15:04:26 -05:00
trgm.h Add word_similarity to pg_trgm contrib module. 2016-03-16 18:59:21 +03:00