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https://github.com/element-hq/synapse
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Tweak the ranking of PG user dir search
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parent
a837765e8c
commit
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1 changed files with 40 additions and 13 deletions
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@ -391,11 +391,14 @@ class UserDirectoryStore(SQLBaseStore):
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]
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}
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"""
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search_query = _parse_query(self.database_engine, search_term)
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if isinstance(self.database_engine, PostgresEngine):
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full_query, exact_query, prefix_query = _parse_query_postgres(search_term)
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# We order by rank and then if they have profile info
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# The ranking algorithm is hand tweaked for "best" results. Broadly
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# the idea is we give a higher weight to exact matches.
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# The array of numbers are the weights for the various part of the
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# search: (domain, _, display name, localpart)
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sql = """
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SELECT user_id, display_name, avatar_url
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FROM user_directory_search
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@ -403,13 +406,27 @@ class UserDirectoryStore(SQLBaseStore):
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INNER JOIN users_in_pubic_room USING (user_id)
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WHERE vector @@ to_tsquery('english', ?)
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ORDER BY
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ts_rank_cd(vector, to_tsquery('english', ?), 1) DESC,
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2 * ts_rank_cd(
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'{0.1, 0.1, 0.9, 1.0}',
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vector,
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to_tsquery('english', ?),
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8
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)
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+ ts_rank_cd(
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'{0.1, 0.1, 0.9, 1.0}',
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vector,
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to_tsquery('english', ?),
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8
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)
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DESC,
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display_name IS NULL,
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avatar_url IS NULL
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LIMIT ?
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"""
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args = (search_query, search_query, limit + 1,)
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args = (full_query, exact_query, prefix_query, limit + 1,)
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elif isinstance(self.database_engine, Sqlite3Engine):
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search_query = _parse_query_sqlite(search_term)
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sql = """
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SELECT user_id, display_name, avatar_url
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FROM user_directory_search
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@ -439,7 +456,7 @@ class UserDirectoryStore(SQLBaseStore):
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})
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def _parse_query(database_engine, search_term):
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def _parse_query_sqlite(search_term):
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"""Takes a plain unicode string from the user and converts it into a form
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that can be passed to database.
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We use this so that we can add prefix matching, which isn't something
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@ -451,11 +468,21 @@ def _parse_query(database_engine, search_term):
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# Pull out the individual words, discarding any non-word characters.
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results = re.findall(r"([\w\-]+)", search_term, re.UNICODE)
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return " & ".join("(%s* | %s)" % (result, result,) for result in results)
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if isinstance(database_engine, PostgresEngine):
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return " & ".join("(%s:* | %s)" % (result, result,) for result in results)
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elif isinstance(database_engine, Sqlite3Engine):
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return " & ".join("(%s* | %s)" % (result, result,) for result in results)
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else:
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# This should be unreachable.
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raise Exception("Unrecognized database engine")
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def _parse_query_postgres(search_term):
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"""Takes a plain unicode string from the user and converts it into a form
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that can be passed to database.
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We use this so that we can add prefix matching, which isn't something
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that is supported by default.
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"""
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# Pull out the individual words, discarding any non-word characters.
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results = re.findall(r"([\w\-]+)", search_term, re.UNICODE)
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both = " & ".join("(%s:* | %s)" % (result, result,) for result in results)
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exact = " & ".join("%s" % (result,) for result in results)
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prefix = " & ".join("%s:*" % (result,) for result in results)
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return both, exact, prefix
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