Postgres数据库获取所有的索引信息的SQL

SELECT
A.SCHEMANAME,
A.TABLENAME,
A.INDEXNAME,
A.TABLESPACE,
A.INDEXDEF,
B.AMNAME,
C.INDEXRELID,
C.INDNATTS,
C.INDISUNIQUE,
C.INDISPRIMARY,
C.INDISCLUSTERED,
D.DESCRIPTION
FROM
PG_AM B
LEFT JOIN PG_CLASS F ON B.OID = F.RELAM
LEFT JOIN PG_STAT_ALL_INDEXES E ON F.OID = E.INDEXRELID
LEFT JOIN PG_INDEX C ON E.INDEXRELID = C.INDEXRELID
LEFT OUTER JOIN PG_DESCRIPTION D ON C.INDEXRELID = D.OBJOID,
PG_INDEXES A
WHERE
A.SCHEMANAME = E.SCHEMANAME AND A.TABLENAME = E.RELNAME AND A.INDEXNAME = E.INDEXRELNAME