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Tom Lane 1925ac281a Fix misbehavior in contrib/pg_trgm with an unsatisfiable regex. ... If the regex compiler can see that a regex is unsatisfiable (for example, '$foo') then it may emit an NFA having no arcs. pg_trgm's packGraph function did the wrong thing in this case; it would access off the end of a work array, and with bad luck could produce a corrupted output data structure causing more problems later. This could end with wrong answers or crashes in queries using a pg_trgm GIN or GiST index with such a regex. Fix by not trying to de-duplicate if there aren't at least 2 arcs. Per bug #17830 from Alexander Lakhin. Back-patch to all supported branches. Discussion: https://postgr.es/m/17830-57ff5f89bdb02b09@postgresql.org		3 years ago
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pg_strict_word_trgm.out	…
pg_trgm.out	Remove redundant grouping and DISTINCT columns.	3 years ago
pg_word_trgm.out	Fix misbehavior in contrib/pg_trgm with an unsatisfiable regex.	3 years ago