Tom Lane cbe25dcff7 Disallow making an empty lexeme via array_to_tsvector(). ... The tsvector data type has always forbidden lexemes to be empty. However, array_to_tsvector() didn't get that memo, and would allow an empty-string array element to become an empty lexeme. This could result in dump/restore failures later, not to mention whatever semantic issues might be behind the original prohibition. However, other functions that take a plain text input directly as a lexeme value do not need a similar restriction, because they only match the string against existing tsvector entries. In particular it'd be a bad idea to make ts_delete() reject empty strings, since that is the most convenient way to clean up any bad data that might have gotten into a tsvector column via this bug. Reflecting on that, let's also remove the prohibition against NULL array elements in tsvector_delete_arr and tsvector_setweight_by_filter. It seems more consistent to ignore them, as an empty-string element would be ignored. There's a case for back-patching this, since it's clearly a bug fix. On balance though, it doesn't seem like something to change in a minor release. Jean-Christophe Arnu Discussion: https://postgr.es/m/CAHZmTm1YVndPgUVRoag2WL0w900XcoiivDDj-gTTYBsG25c65A@mail.gmail.com		2021-11-06 13:28:53 -04:00
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src	Disallow making an empty lexeme via array_to_tsvector().	2021-11-06 13:28:53 -04:00
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