Redshift Research Project

System Table Tracker

System view information_schema.columns version 1.0.55524 / 2023-08-30

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SELECT CAST(current_database() AS information_schema.sql_identifier) AS table_catalog,
       CAST(nc.nspname AS information_schema.sql_identifier) AS table_schema,
       CAST(c.relname AS information_schema.sql_identifier) AS table_name,
       CAST(a.attname AS information_schema.sql_identifier) AS column_name,
       CAST(a.attnum AS information_schema.cardinal_number) AS ordinal_position,
       CAST(ad.adsrc AS information_schema.character_data) AS column_default,
       CAST(CASE
              WHEN a.attnotnull
                OR (t.typtype = CAST('d' AS "char")
                AND t.typnotnull)
                THEN CAST('NO' AS text)
              ELSE CAST('YES' AS text)
            END AS information_schema.character_data) AS is_nullable,
       CAST(CASE
              WHEN t.typtype = CAST('d' AS "char")
                THEN CASE
                       WHEN bt.typelem <> CAST(0 AS oid)
                        AND bt.typlen = -1
                         THEN CAST('ARRAY' AS text)
                       WHEN nbt.nspname = CAST('pg_catalog' AS name)
                         THEN format_type(t.typbasetype,
                                          CAST(NULL AS integer))
                       ELSE CAST('USER-DEFINED' AS text)
                     END
              ELSE CASE
                     WHEN t.typelem <> CAST(0 AS oid)
                      AND t.typlen = -1
                       THEN CAST('ARRAY' AS text)
                     WHEN nt.nspname = CAST('pg_catalog' AS name)
                       THEN format_type(a.atttypid,
                                        CAST(NULL AS integer))
                     ELSE CAST('USER-DEFINED' AS text)
                   END
            END AS information_schema.character_data) AS data_type,
       CAST(information_schema._pg_char_max_length(information_schema._pg_truetypid(a.*, t.*),
                                                   information_schema._pg_truetypmod(a.*, t.*)) AS information_schema.cardinal_number) AS character_maximum_length,
       CAST(information_schema._pg_char_octet_length(information_schema._pg_truetypid(a.*, t.*),
                                                     information_schema._pg_truetypmod(a.*, t.*)) AS information_schema.cardinal_number) AS character_octet_length,
       CAST(information_schema._pg_numeric_precision(information_schema._pg_truetypid(a.*, t.*),
                                                     information_schema._pg_truetypmod(a.*, t.*)) AS information_schema.cardinal_number) AS numeric_precision,
       CAST(information_schema._pg_numeric_precision_radix(information_schema._pg_truetypid(a.*, t.*),
                                                           information_schema._pg_truetypmod(a.*, t.*)) AS information_schema.cardinal_number) AS numeric_precision_radix,
       CAST(information_schema._pg_numeric_scale(information_schema._pg_truetypid(a.*, t.*),
                                                 information_schema._pg_truetypmod(a.*, t.*)) AS information_schema.cardinal_number) AS numeric_scale,
       CAST(information_schema._pg_datetime_precision(information_schema._pg_truetypid(a.*, t.*),
                                                      information_schema._pg_truetypmod(a.*, t.*)) AS information_schema.cardinal_number) AS datetime_precision,
       CAST(CAST(NULL AS information_schema.character_data) AS information_schema.character_data) AS interval_type,
       CAST(CAST(NULL AS information_schema.character_data) AS information_schema.character_data) AS interval_precision,
       CAST(CAST(NULL AS information_schema.sql_identifier) AS information_schema.sql_identifier) AS character_set_catalog,
       CAST(CAST(NULL AS information_schema.sql_identifier) AS information_schema.sql_identifier) AS character_set_schema,
       CAST(CAST(NULL AS information_schema.sql_identifier) AS information_schema.sql_identifier) AS character_set_name,
       CAST(CAST(NULL AS information_schema.sql_identifier) AS information_schema.sql_identifier) AS collation_catalog,
       CAST(CAST(NULL AS information_schema.sql_identifier) AS information_schema.sql_identifier) AS collation_schema,
       CAST(CAST(NULL AS information_schema.sql_identifier) AS information_schema.sql_identifier) AS collation_name,
       CAST(CASE
              WHEN t.typtype = CAST('d' AS "char")
                THEN current_database()
              ELSE CAST(NULL AS name)
            END AS information_schema.sql_identifier) AS domain_catalog,
       CAST(CASE
              WHEN t.typtype = CAST('d' AS "char")
                THEN nt.nspname
              ELSE CAST(NULL AS name)
            END AS information_schema.sql_identifier) AS domain_schema,
       CAST(CASE
              WHEN t.typtype = CAST('d' AS "char")
                THEN t.typname
              ELSE CAST(NULL AS name)
            END AS information_schema.sql_identifier) AS domain_name,
       CAST(current_database() AS information_schema.sql_identifier) AS udt_catalog,
       CAST(COALESCE(nbt.nspname, nt.nspname) AS information_schema.sql_identifier) AS udt_schema,
       CAST(COALESCE(bt.typname, t.typname) AS information_schema.sql_identifier) AS udt_name,
       CAST(CAST(NULL AS information_schema.sql_identifier) AS information_schema.sql_identifier) AS scope_catalog,
       CAST(CAST(NULL AS information_schema.sql_identifier) AS information_schema.sql_identifier) AS scope_schema,
       CAST(CAST(NULL AS information_schema.sql_identifier) AS information_schema.sql_identifier) AS scope_name,
       CAST(CAST(NULL AS information_schema.cardinal_number) AS information_schema.cardinal_number) AS maximum_cardinality,
       CAST(a.attnum AS information_schema.sql_identifier) AS dtd_identifier,
       CAST(CAST('NO' AS information_schema.character_data) AS information_schema.character_data) AS is_self_referencing
FROM pg_attribute AS a
     LEFT JOIN pg_attrdef AS ad ON a.attrelid = ad.adrelid
                               AND a.attnum = ad.adnum,
     pg_class AS c,
     pg_namespace AS nc,
     pg_user AS u,
     pg_type AS t
     INNER JOIN pg_namespace AS nt ON t.typnamespace = nt.oid
     LEFT JOIN (pg_type AS bt
                INNER JOIN pg_namespace AS nbt ON bt.typnamespace = nbt.oid)
        ON t.typtype = CAST('d' AS "char")
       AND t.typbasetype = bt.oid
WHERE a.attrelid = c.oid
  AND a.atttypid = t.oid
  AND u.usesysid = c.relowner
  AND nc.oid = c.relnamespace
  AND a.attnum > 0
  AND NOT a.attisdropped
  AND (c.relkind = CAST('r' AS "char")
    OR c.relkind = CAST('v' AS "char"))
  AND (u.usename = CAST("current_user"() AS name)
    OR has_table_privilege(c.oid,
                           CAST('SELECT' AS text))
    OR has_table_privilege(c.oid,
                           CAST('INSERT' AS text))
    OR has_table_privilege(c.oid,
                           CAST('UPDATE' AS text))
    OR has_table_privilege(c.oid,
                           CAST('REFERENCES' AS text))
    OR has_column_privilege(c.oid,
                            a.attnum,
                            CAST('SELECT' AS text))
    OR has_column_privilege(c.oid,
                            a.attnum,
                            CAST('UPDATE' AS text)))

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