Improve English wording of some other getObjectDescription() messages.

Print columns as "column C of <relation>" rather than "<relation> column
C".  This seems to read noticeably better in English, as evidenced by the
regression test output changes, and the code change also makes it possible
for translators to adjust the phrase order in other languages.

Also change the output for OCLASS_DEFAULT from "default for %s" to
"default value for %s".  This seems to read better and is also more
consistent with the output of, for instance, getObjectTypeDescription().

Kyotaro Horiguchi, per a complaint from me

Discussion: https://postgr.es/m/20180522.182020.114074746.horiguchi.kyotaro@lab.ntt.co.jp

contrib/earthdistance/expected/earthdistance.out

@@ -985,7 +985,7 @@ HINT:  You can drop extension cube instead.
 create table foo (f1 cube, f2 int);
 drop extension cube;  -- fail, foo.f1 requires it
 ERROR:  cannot drop extension cube because other objects depend on it
-DETAIL:  table foo column f1 depends on type cube
+DETAIL:  column f1 of table foo depends on type cube
 HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 drop table foo;
 drop extension cube;
@@ -1039,15 +1039,15 @@ create extension cube with schema c;
 create table foo (f1 c.cube, f2 int);
 drop extension cube;  -- fail, foo.f1 requires it
 ERROR:  cannot drop extension cube because other objects depend on it
-DETAIL:  table foo column f1 depends on type c.cube
+DETAIL:  column f1 of table foo depends on type c.cube
 HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 drop schema c;  -- fail, cube requires it
 ERROR:  cannot drop schema c because other objects depend on it
 DETAIL:  extension cube depends on schema c
-table foo column f1 depends on type c.cube
+column f1 of table foo depends on type c.cube
 HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 drop extension cube cascade;
-NOTICE:  drop cascades to table foo column f1
+NOTICE:  drop cascades to column f1 of table foo
 \d foo
                 Table "public.foo"
  Column |  Type   | Collation | Nullable | Default 

contrib/postgres_fdw/expected/postgres_fdw.out

@@ -8116,7 +8116,7 @@ CREATE TABLE import_source.t5 (c1 int, c2 text collate "C", "Col" "Colors");
 CREATE SCHEMA import_dest5;
 BEGIN;
 DROP TYPE "Colors" CASCADE;
-NOTICE:  drop cascades to table import_source.t5 column Col
+NOTICE:  drop cascades to column Col of table import_source.t5
 IMPORT FOREIGN SCHEMA import_source LIMIT TO (t5)
   FROM SERVER loopback INTO import_dest5;  -- ERROR
 ERROR:  type "public.Colors" does not exist

src/backend/catalog/objectaddress.c

@@ -2681,12 +2681,23 @@ getObjectDescription(const ObjectAddress *object)
 	switch (getObjectClass(object))
 	{
 		case OCLASS_CLASS:
-			getRelationDescription(&buffer, object->objectId);
-			if (object->objectSubId != 0)
-				appendStringInfo(&buffer, _(" column %s"),
+			if (object->objectSubId == 0)
+				getRelationDescription(&buffer, object->objectId);
+			else
+			{
+				/* column, not whole relation */
+				StringInfoData rel;
+
+				initStringInfo(&rel);
+				getRelationDescription(&rel, object->objectId);
+				/* translator: second %s is, e.g., "table %s" */
+				appendStringInfo(&buffer, _("column %s of %s"),
 								 get_attname(object->objectId,
 											 object->objectSubId,
-											 false));
+											 false),
+								 rel.data);
+				pfree(rel.data);
+			}
 			break;
 
 		case OCLASS_PROC:
@@ -2850,7 +2861,8 @@ getObjectDescription(const ObjectAddress *object)
 				colobject.objectId = attrdef->adrelid;
 				colobject.objectSubId = attrdef->adnum;
 
-				appendStringInfo(&buffer, _("default for %s"),
+				/* translator: %s is typically "column %s of table %s" */
+				appendStringInfo(&buffer, _("default value for %s"),
 								 getObjectDescription(&colobject));
 
 				systable_endscan(adscan);

src/test/regress/expected/alter_table.out

@@ -1844,7 +1844,7 @@ select * from foo;
 (1 row)
 
 drop domain mytype cascade;
-NOTICE:  drop cascades to table foo column f2
+NOTICE:  drop cascades to column f2 of table foo
 select * from foo;
  f1 | f3 
 ----+----
@@ -2870,8 +2870,8 @@ DROP TABLE test_tbl2_subclass;
 CREATE TYPE test_typex AS (a int, b text);
 CREATE TABLE test_tblx (x int, y test_typex check ((y).a > 0));
 ALTER TYPE test_typex DROP ATTRIBUTE a; -- fails
-ERROR:  cannot drop composite type test_typex column a because other objects depend on it
-DETAIL:  constraint test_tblx_y_check on table test_tblx depends on composite type test_typex column a
+ERROR:  cannot drop column a of composite type test_typex because other objects depend on it
+DETAIL:  constraint test_tblx_y_check on table test_tblx depends on column a of composite type test_typex
 HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 ALTER TYPE test_typex DROP ATTRIBUTE a CASCADE;
 NOTICE:  drop cascades to constraint test_tblx_y_check on table test_tblx

src/test/regress/expected/collate.out

@@ -631,7 +631,7 @@ DROP COLLATION mycoll1;
 CREATE TABLE collate_test23 (f1 text collate mycoll2);
 DROP COLLATION mycoll2;  -- fail
 ERROR:  cannot drop collation mycoll2 because other objects depend on it
-DETAIL:  table collate_test23 column f1 depends on collation mycoll2
+DETAIL:  column f1 of table collate_test23 depends on collation mycoll2
 HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 -- invalid: non-lowercase quoted identifiers
 CREATE COLLATION case_coll ("Lc_Collate" = "POSIX", "Lc_Ctype" = "POSIX");

src/test/regress/expected/domain.out

@@ -298,8 +298,8 @@ ERROR:  operator does not exist: character varying > double precision
 HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.
 alter type comptype alter attribute r type bigint;
 alter type comptype drop attribute r;  -- fail
-ERROR:  cannot drop composite type comptype column r because other objects depend on it
-DETAIL:  constraint c1 depends on composite type comptype column r
+ERROR:  cannot drop column r of composite type comptype because other objects depend on it
+DETAIL:  constraint c1 depends on column r of composite type comptype
 HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 alter type comptype drop attribute i;
 select conname, obj_description(oid, 'pg_constraint') from pg_constraint
@@ -645,8 +645,8 @@ alter domain dnotnulltest drop not null;
 update domnotnull set col1 = null;
 drop domain dnotnulltest cascade;
 NOTICE:  drop cascades to 2 other objects
-DETAIL:  drop cascades to table domnotnull column col1
-drop cascades to table domnotnull column col2
+DETAIL:  drop cascades to column col1 of table domnotnull
+drop cascades to column col2 of table domnotnull
 -- Test ALTER DOMAIN .. DEFAULT ..
 create table domdeftest (col1 ddef1);
 insert into domdeftest default values;

src/test/regress/expected/sequence.out

@@ -293,11 +293,11 @@ CREATE TEMP TABLE t1 (
 -- Both drops should fail, but with different error messages:
 DROP SEQUENCE t1_f1_seq;
 ERROR:  cannot drop sequence t1_f1_seq because other objects depend on it
-DETAIL:  default for table t1 column f1 depends on sequence t1_f1_seq
+DETAIL:  default value for column f1 of table t1 depends on sequence t1_f1_seq
 HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 DROP SEQUENCE myseq2;
 ERROR:  cannot drop sequence myseq2 because other objects depend on it
-DETAIL:  default for table t1 column f2 depends on sequence myseq2
+DETAIL:  default value for column f2 of table t1 depends on sequence myseq2
 HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 -- This however will work:
 DROP SEQUENCE myseq3;

src/test/regress/expected/triggers.out

@@ -557,10 +557,10 @@ LINE 2: FOR EACH STATEMENT WHEN (OLD.* IS DISTINCT FROM NEW.*)
                                  ^
 -- check dependency restrictions
 ALTER TABLE main_table DROP COLUMN b;
-ERROR:  cannot drop table main_table column b because other objects depend on it
-DETAIL:  trigger after_upd_b_row_trig on table main_table depends on table main_table column b
-trigger after_upd_a_b_row_trig on table main_table depends on table main_table column b
-trigger after_upd_b_stmt_trig on table main_table depends on table main_table column b
+ERROR:  cannot drop column b of table main_table because other objects depend on it
+DETAIL:  trigger after_upd_b_row_trig on table main_table depends on column b of table main_table
+trigger after_upd_a_b_row_trig on table main_table depends on column b of table main_table
+trigger after_upd_b_stmt_trig on table main_table depends on column b of table main_table
 HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 -- this should succeed, but we'll roll it back to keep the triggers around
 begin;