Change the relkind for partitioned tables from 'P' to 'p'.

Seven of the eight other relkind codes are lower-case, so it wasn't
consistent for this one to be upper-case.  Fix it while we still can.

Historical notes: the reason for the lone exception, i.e. sequences being
'S', is that 's' was once used for "special" relations.  Also, at one time
the partitioned-tables patch used both 'P' and 'p', but that got changed,
leaving only a surprising choice behind.

This also fixes a couple little bits of technical debt, such as
type_sanity.sql not knowing that 'm' is a legal value for relkind.

Discussion: https://postgr.es/m/27899.1488909319@sss.pgh.pa.us

doc/src/sgml/catalogs.sgml

@@ -1758,12 +1758,15 @@
       <entry><type>char</type></entry>
       <entry></entry>
       <entry>
-       <literal>r</> = ordinary table, <literal>P</> = partitioned table,
-       <literal>i</> = index
-       <literal>S</> = sequence, <literal>v</> = view,
+       <literal>r</> = ordinary table,
+       <literal>i</> = index,
+       <literal>S</> = sequence,
+       <literal>t</> = TOAST table,
+       <literal>v</> = view,
        <literal>m</> = materialized view,
-       <literal>c</> = composite type, <literal>t</> = TOAST table,
-       <literal>f</> = foreign table
+       <literal>c</> = composite type,
+       <literal>f</> = foreign table,
+       <literal>p</> = partitioned table
       </entry>
      </row>
 

src/backend/catalog/information_schema.sql

@@ -365,7 +365,7 @@ CREATE VIEW attributes AS
            ON a.attcollation = co.oid AND (nco.nspname, co.collname) <> ('pg_catalog', 'default')
 
     WHERE a.attnum > 0 AND NOT a.attisdropped
-          AND c.relkind in ('c')
+          AND c.relkind IN ('c')
           AND (pg_has_role(c.relowner, 'USAGE')
                OR has_type_privilege(c.reltype, 'USAGE'));
 
@@ -453,7 +453,7 @@ CREATE VIEW check_constraints AS
       AND a.attnum > 0
       AND NOT a.attisdropped
       AND a.attnotnull
-      AND r.relkind IN ('r', 'P')
+      AND r.relkind IN ('r', 'p')
       AND pg_has_role(r.relowner, 'USAGE');
 
 GRANT SELECT ON check_constraints TO PUBLIC;
@@ -525,7 +525,7 @@ CREATE VIEW column_domain_usage AS
           AND a.attrelid = c.oid
           AND a.atttypid = t.oid
           AND t.typtype = 'd'
-          AND c.relkind IN ('r', 'v', 'f', 'P')
+          AND c.relkind IN ('r', 'v', 'f', 'p')
           AND a.attnum > 0
           AND NOT a.attisdropped
           AND pg_has_role(t.typowner, 'USAGE');
@@ -564,7 +564,7 @@ CREATE VIEW column_privileges AS
                   pr_c.relowner
            FROM (SELECT oid, relname, relnamespace, relowner, (aclexplode(coalesce(relacl, acldefault('r', relowner)))).*
                  FROM pg_class
-                 WHERE relkind IN ('r', 'v', 'f', 'P')
+                 WHERE relkind IN ('r', 'v', 'f', 'p')
                 ) pr_c (oid, relname, relnamespace, relowner, grantor, grantee, prtype, grantable),
                 pg_attribute a
            WHERE a.attrelid = pr_c.oid
@@ -586,7 +586,7 @@ CREATE VIEW column_privileges AS
                 ) pr_a (attrelid, attname, grantor, grantee, prtype, grantable),
                 pg_class c
            WHERE pr_a.attrelid = c.oid
-                 AND relkind IN ('r', 'v', 'f', 'P')
+                 AND relkind IN ('r', 'v', 'f', 'p')
          ) x,
          pg_namespace nc,
          pg_authid u_grantor,
@@ -629,7 +629,8 @@ CREATE VIEW column_udt_usage AS
     WHERE a.attrelid = c.oid
           AND a.atttypid = t.oid
           AND nc.oid = c.relnamespace
-          AND a.attnum > 0 AND NOT a.attisdropped AND c.relkind in ('r', 'v', 'f', 'P')
+          AND a.attnum > 0 AND NOT a.attisdropped
+          AND c.relkind in ('r', 'v', 'f', 'p')
           AND pg_has_role(coalesce(bt.typowner, t.typowner), 'USAGE');
 
 GRANT SELECT ON column_udt_usage TO PUBLIC;
@@ -738,7 +739,7 @@ CREATE VIEW columns AS
            CAST('NEVER' AS character_data) AS is_generated,
            CAST(null AS character_data) AS generation_expression,
 
-           CAST(CASE WHEN c.relkind IN ('r', 'P') OR
+           CAST(CASE WHEN c.relkind IN ('r', 'p') OR
                           (c.relkind IN ('v', 'f') AND
                            pg_column_is_updatable(c.oid, a.attnum, false))
                 THEN 'YES' ELSE 'NO' END AS yes_or_no) AS is_updatable
@@ -753,7 +754,8 @@ CREATE VIEW columns AS
 
     WHERE (NOT pg_is_other_temp_schema(nc.oid))
 
-          AND a.attnum > 0 AND NOT a.attisdropped AND c.relkind in ('r', 'v', 'f', 'P')
+          AND a.attnum > 0 AND NOT a.attisdropped
+          AND c.relkind IN ('r', 'v', 'f', 'p')
 
           AND (pg_has_role(c.relowner, 'USAGE')
                OR has_column_privilege(c.oid, a.attnum,
@@ -789,7 +791,7 @@ CREATE VIEW constraint_column_usage AS
             AND d.objid = c.oid
             AND c.connamespace = nc.oid
             AND c.contype = 'c'
-            AND r.relkind IN ('r', 'P')
+            AND r.relkind IN ('r', 'p')
             AND NOT a.attisdropped
 
         UNION ALL
@@ -805,7 +807,7 @@ CREATE VIEW constraint_column_usage AS
             AND a.attnum = ANY (CASE c.contype WHEN 'f' THEN c.confkey ELSE c.conkey END)
             AND NOT a.attisdropped
             AND c.contype IN ('p', 'u', 'f')
-            AND r.relkind IN ('r', 'P')
+            AND r.relkind IN ('r', 'p')
 
       ) AS x (tblschema, tblname, tblowner, colname, cstrschema, cstrname)
 
@@ -841,7 +843,7 @@ CREATE VIEW constraint_table_usage AS
     WHERE c.connamespace = nc.oid AND r.relnamespace = nr.oid
           AND ( (c.contype = 'f' AND c.confrelid = r.oid)
              OR (c.contype IN ('p', 'u') AND c.conrelid = r.oid) )
-          AND r.relkind IN ('r', 'P')
+          AND r.relkind IN ('r', 'p')
           AND pg_has_role(r.relowner, 'USAGE');
 
 GRANT SELECT ON constraint_table_usage TO PUBLIC;
@@ -1058,7 +1060,7 @@ CREATE VIEW key_column_usage AS
                 AND r.oid = c.conrelid
                 AND nc.oid = c.connamespace
                 AND c.contype IN ('p', 'u', 'f')
-                AND r.relkind IN ('r', 'P')
+                AND r.relkind IN ('r', 'p')
                 AND (NOT pg_is_other_temp_schema(nr.oid)) ) AS ss
     WHERE ss.roid = a.attrelid
           AND a.attnum = (ss.x).x
@@ -1774,7 +1776,7 @@ CREATE VIEW table_constraints AS
     WHERE nc.oid = c.connamespace AND nr.oid = r.relnamespace
           AND c.conrelid = r.oid
           AND c.contype NOT IN ('t', 'x')  -- ignore nonstandard constraints
-          AND r.relkind IN ('r', 'P')
+          AND r.relkind IN ('r', 'p')
           AND (NOT pg_is_other_temp_schema(nr.oid))
           AND (pg_has_role(r.relowner, 'USAGE')
                -- SELECT privilege omitted, per SQL standard
@@ -1804,7 +1806,7 @@ CREATE VIEW table_constraints AS
           AND a.attnotnull
           AND a.attnum > 0
           AND NOT a.attisdropped
-          AND r.relkind IN ('r', 'P')
+          AND r.relkind IN ('r', 'p')
           AND (NOT pg_is_other_temp_schema(nr.oid))
           AND (pg_has_role(r.relowner, 'USAGE')
                -- SELECT privilege omitted, per SQL standard
@@ -1854,7 +1856,7 @@ CREATE VIEW table_privileges AS
          ) AS grantee (oid, rolname)
 
     WHERE c.relnamespace = nc.oid
-          AND c.relkind IN ('r', 'v', 'P')
+          AND c.relkind IN ('r', 'v', 'p')
           AND c.grantee = grantee.oid
           AND c.grantor = u_grantor.oid
           AND c.prtype IN ('INSERT', 'SELECT', 'UPDATE', 'DELETE', 'TRUNCATE', 'REFERENCES', 'TRIGGER')
@@ -1898,7 +1900,7 @@ CREATE VIEW tables AS
 
            CAST(
              CASE WHEN nc.oid = pg_my_temp_schema() THEN 'LOCAL TEMPORARY'
-                  WHEN c.relkind IN ('r', 'P') THEN 'BASE TABLE'
+                  WHEN c.relkind IN ('r', 'p') THEN 'BASE TABLE'
                   WHEN c.relkind = 'v' THEN 'VIEW'
                   WHEN c.relkind = 'f' THEN 'FOREIGN TABLE'
                   ELSE null END
@@ -1911,7 +1913,7 @@ CREATE VIEW tables AS
            CAST(nt.nspname AS sql_identifier) AS user_defined_type_schema,
            CAST(t.typname AS sql_identifier) AS user_defined_type_name,
 
-           CAST(CASE WHEN c.relkind IN ('r', 'P') OR
+           CAST(CASE WHEN c.relkind IN ('r', 'p') OR
                           (c.relkind IN ('v', 'f') AND
                            -- 1 << CMD_INSERT
                            pg_relation_is_updatable(c.oid, false) & 8 = 8)
@@ -1923,7 +1925,7 @@ CREATE VIEW tables AS
     FROM pg_namespace nc JOIN pg_class c ON (nc.oid = c.relnamespace)
            LEFT JOIN (pg_type t JOIN pg_namespace nt ON (t.typnamespace = nt.oid)) ON (c.reloftype = t.oid)
 
-    WHERE c.relkind IN ('r', 'v', 'f', 'P')
+    WHERE c.relkind IN ('r', 'v', 'f', 'p')
           AND (NOT pg_is_other_temp_schema(nc.oid))
           AND (pg_has_role(c.relowner, 'USAGE')
                OR has_table_privilege(c.oid, 'SELECT, INSERT, UPDATE, DELETE, TRUNCATE, REFERENCES, TRIGGER')
@@ -2442,7 +2444,7 @@ CREATE VIEW view_column_usage AS
           AND dt.refclassid = 'pg_catalog.pg_class'::regclass
           AND dt.refobjid = t.oid
           AND t.relnamespace = nt.oid
-          AND t.relkind IN ('r', 'v', 'f', 'P')
+          AND t.relkind IN ('r', 'v', 'f', 'p')
           AND t.oid = a.attrelid
           AND dt.refobjsubid = a.attnum
           AND pg_has_role(t.relowner, 'USAGE');
@@ -2520,7 +2522,7 @@ CREATE VIEW view_table_usage AS
           AND dt.refclassid = 'pg_catalog.pg_class'::regclass
           AND dt.refobjid = t.oid
           AND t.relnamespace = nt.oid
-          AND t.relkind IN ('r', 'v', 'f', 'P')
+          AND t.relkind IN ('r', 'v', 'f', 'p')
           AND pg_has_role(t.relowner, 'USAGE');
 
 GRANT SELECT ON view_table_usage TO PUBLIC;
@@ -2673,7 +2675,7 @@ CREATE VIEW element_types AS
                   a.attnum, a.atttypid, a.attcollation
            FROM pg_class c, pg_attribute a
            WHERE c.oid = a.attrelid
-                 AND c.relkind IN ('r', 'v', 'f', 'c', 'P')
+                 AND c.relkind IN ('r', 'v', 'f', 'c', 'p')
                  AND attnum > 0 AND NOT attisdropped
 
            UNION ALL

src/backend/catalog/system_views.sql

@@ -136,7 +136,7 @@ CREATE VIEW pg_tables AS
         C.relrowsecurity AS rowsecurity
     FROM pg_class C LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
          LEFT JOIN pg_tablespace T ON (T.oid = C.reltablespace)
-    WHERE C.relkind IN ('r', 'P');
+    WHERE C.relkind IN ('r', 'p');
 
 CREATE VIEW pg_matviews AS
     SELECT
@@ -294,7 +294,7 @@ CREATE VIEW pg_prepared_statements AS
 CREATE VIEW pg_seclabels AS
 SELECT
 	l.objoid, l.classoid, l.objsubid,
-	CASE WHEN rel.relkind IN ('r', 'P') THEN 'table'::text
+	CASE WHEN rel.relkind IN ('r', 'p') THEN 'table'::text
 		 WHEN rel.relkind = 'v' THEN 'view'::text
 		 WHEN rel.relkind = 'm' THEN 'materialized view'::text
 		 WHEN rel.relkind = 'S' THEN 'sequence'::text

src/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201703081
+#define CATALOG_VERSION_NO	201703101
 
 #endif

src/include/catalog/pg_class.h

@@ -162,10 +162,10 @@ DESCR("");
 #define		  RELKIND_SEQUENCE		  'S'		/* sequence object */
 #define		  RELKIND_TOASTVALUE	  't'		/* for out-of-line values */
 #define		  RELKIND_VIEW			  'v'		/* view */
+#define		  RELKIND_MATVIEW		  'm'		/* materialized view */
 #define		  RELKIND_COMPOSITE_TYPE  'c'		/* composite type */
 #define		  RELKIND_FOREIGN_TABLE   'f'		/* foreign table */
-#define		  RELKIND_MATVIEW		  'm'		/* materialized view */
-#define		  RELKIND_PARTITIONED_TABLE 'P'		/* partitioned table */
+#define		  RELKIND_PARTITIONED_TABLE 'p'		/* partitioned table */
 
 #define		  RELPERSISTENCE_PERMANENT	'p'		/* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u'		/* unlogged permanent table */
@@ -178,9 +178,10 @@ DESCR("");
 /* all columns are logged as replica identity */
 #define		  REPLICA_IDENTITY_FULL		'f'
 /*
- * an explicitly chosen candidate key's columns are used as identity;
- * will still be set if the index has been dropped, in that case it
- * has the same meaning as 'd'
+ * an explicitly chosen candidate key's columns are used as replica identity.
+ * Note this will still be set if the index has been dropped; in that case it
+ * has the same meaning as 'd'.
  */
 #define		  REPLICA_IDENTITY_INDEX	'i'
+
 #endif   /* PG_CLASS_H */

src/test/regress/expected/create_table.out

@@ -404,7 +404,7 @@ CREATE TABLE partitioned (
 SELECT relkind FROM pg_class WHERE relname = 'partitioned';
  relkind 
 ---------
- P
+ p
 (1 row)
 
 -- check that range partition key columns are marked NOT NULL

src/test/regress/expected/rules.out

@@ -1481,7 +1481,7 @@ pg_seclabels| SELECT l.objoid,
     l.classoid,
     l.objsubid,
         CASE
-            WHEN (rel.relkind = ANY (ARRAY['r'::"char", 'P'::"char"])) THEN 'table'::text
+            WHEN (rel.relkind = ANY (ARRAY['r'::"char", 'p'::"char"])) THEN 'table'::text
             WHEN (rel.relkind = 'v'::"char") THEN 'view'::text
             WHEN (rel.relkind = 'm'::"char") THEN 'materialized view'::text
             WHEN (rel.relkind = 'S'::"char") THEN 'sequence'::text
@@ -2171,7 +2171,7 @@ pg_tables| SELECT n.nspname AS schemaname,
    FROM ((pg_class c
      LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace)))
      LEFT JOIN pg_tablespace t ON ((t.oid = c.reltablespace)))
-  WHERE (c.relkind = ANY (ARRAY['r'::"char", 'P'::"char"]));
+  WHERE (c.relkind = ANY (ARRAY['r'::"char", 'p'::"char"]));
 pg_timezone_abbrevs| SELECT pg_timezone_abbrevs.abbrev,
     pg_timezone_abbrevs.utc_offset,
     pg_timezone_abbrevs.is_dst

src/test/regress/expected/sanity_check.out

@@ -9,7 +9,7 @@ VACUUM;
 \a\t
 SELECT relname, relhasindex
    FROM pg_class c LEFT JOIN pg_namespace n ON n.oid = relnamespace
-   WHERE relkind IN ('r', 'P') AND (nspname ~ '^pg_temp_') IS NOT TRUE
+   WHERE relkind IN ('r', 'p') AND (nspname ~ '^pg_temp_') IS NOT TRUE
    ORDER BY relname;
 a|f
 a_star|f

src/test/regress/expected/type_sanity.out

@@ -464,7 +464,7 @@ ORDER BY 1;
 -- Look for illegal values in pg_class fields
 SELECT p1.oid, p1.relname
 FROM pg_class as p1
-WHERE relkind NOT IN ('r', 'i', 's', 'S', 'c', 't', 'v', 'f') OR
+WHERE relkind NOT IN ('r', 'i', 'S', 't', 'v', 'm', 'c', 'f', 'p') OR
     relpersistence NOT IN ('p', 'u', 't') OR
     relreplident NOT IN ('d', 'n', 'f', 'i');
  oid | relname 

src/test/regress/sql/sanity_check.sql

@@ -12,7 +12,7 @@ VACUUM;
 
 SELECT relname, relhasindex
    FROM pg_class c LEFT JOIN pg_namespace n ON n.oid = relnamespace
-   WHERE relkind IN ('r', 'P') AND (nspname ~ '^pg_temp_') IS NOT TRUE
+   WHERE relkind IN ('r', 'p') AND (nspname ~ '^pg_temp_') IS NOT TRUE
    ORDER BY relname;
 
 -- restore normal output mode

src/test/regress/sql/type_sanity.sql

@@ -339,7 +339,7 @@ ORDER BY 1;
 
 SELECT p1.oid, p1.relname
 FROM pg_class as p1
-WHERE relkind NOT IN ('r', 'i', 's', 'S', 'c', 't', 'v', 'f') OR
+WHERE relkind NOT IN ('r', 'i', 'S', 't', 'v', 'm', 'c', 'f', 'p') OR
     relpersistence NOT IN ('p', 'u', 't') OR
     relreplident NOT IN ('d', 'n', 'f', 'i');