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

2 files changed, 25 insertions, 23 deletions

diff --git a/src/backend/catalog/information_schema.sql b/src/backend/catalog/information_schema.sql
index 51795cd6ded..fa2a88fc5c0 100644
--- a/src/backend/catalog/information_schema.sql
+++ b/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
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index ba980de86bb..0bce20914e0 100644
--- a/src/backend/catalog/system_views.sql
+++ b/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