November 2019
Beginner to intermediate
470 pages
11h 59m
English
Content preview from Mastering PostgreSQL 12 - Third Edition
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Debugging your search
Sometimes, it is not quite clear why a query matches a given search string. To debug your query, PostgreSQL offers the ts_debug function. From a user's point of view, it can be used just like to_tsvector. It reveals a lot about the inner workings of the full-text search infrastructure:
test=# \x
Expanded display is on. test=# SELECT * FROM ts_debug('english', 'go to www.postgresql-support.de'); -[ RECORD 1 ]+---------------------------- alias | asciiword
description | Word, all ASCII
token | go
dictionaries | {english_stem} dictionary | english_stem lexemes | {go}
-[ RECORD 2 ]+---------------------------- alias | blank
description | Space symbols token |
dictionaries | {} dictionary | lexemes | -[ RECORD 3 ]+---------------------------- ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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