The pg_ts_parser catalog contains entries defining text search parsers. A parser is responsible for splitting input text into lexemes and assigning a token type to each lexeme. Since a parser must be implemented by C-language-level functions, creation of new parsers is restricted to database superusers.
PostgreSQL's text search features are described at length in Chapter 12.
Table 50-53. pg_ts_parser Columns
| Name | Type | References | Description |
|---|---|---|---|
oid | oid | Row identifier (hidden attribute; must be explicitly selected) | |
prsname | name | Text search parser name | |
prsnamespace | oid | | The OID of the namespace that contains this parser |
prsstart | regproc | | OID of the parser's startup function |
prstoken | regproc | | OID of the parser's next-token function |
prsend | regproc | | OID of the parser's shutdown function |
prsheadline | regproc | | OID of the parser's headline function |
prslextype | regproc | | OID of the parser's lextype function |
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