Collect attribute data on extension owned tables being dumped

If this data is not collected, pg_dump segfaults if asked for column
inserts.

Fix by Fabrízio de Royes Mello

Backpatch to release 12 where the bug was introduced.

src/bin/pg_dump/pg_dump.c

@@ -2095,6 +2095,8 @@ dumpTableData_insert(Archive *fout, void *dcontext)
 			if (nfields == 0)
 				continue;
 
+			Assert(tbinfo->attgenerated);
+
 			/* Emit a row heading */
 			if (rows_per_statement == 1)
 				archputs(" (", fout);
@@ -17913,6 +17915,8 @@ processExtensionTables(Archive *fout, ExtensionInfo extinfo[],
 							configtbl->dataObj->filtercond = pg_strdup(extconditionarray[j]);
 					}
 				}
+
+				configtbl->interesting = dumpobj;
 			}
 		}
 		if (extconfigarray)

src/test/modules/test_pg_dump/t/001_base.pl

@@ -135,6 +135,12 @@ my %pgdump_runs = (
 			"$tempdir/defaults_tar_format.tar",
 		],
 	},
+	extension_schema => {
+		dump_cmd => [
+			'pg_dump', '--schema=public', '--inserts',
+			"--file=$tempdir/extension_schema.sql", 'postgres',
+		],
+	},
 	pg_dumpall_globals => {
 		dump_cmd => [
 			'pg_dumpall',                             '--no-sync',
@@ -303,6 +309,7 @@ my %tests = (
 			%full_runs,
 			data_only        => 1,
 			section_data     => 1,
+			extension_schema => 1,
 		},
 	},
 
@@ -536,6 +543,7 @@ my %tests = (
 		like   => {%pgdump_runs},
 		unlike => {
 			data_only          => 1,
+			extension_schema   => 1,
 			pg_dumpall_globals => 1,
 			section_data       => 1,
 			section_pre_data   => 1,
@@ -549,6 +557,7 @@ my %tests = (
 		like   => {%pgdump_runs},
 		unlike => {
 			data_only          => 1,
+			extension_schema   => 1,
 			pg_dumpall_globals => 1,
 			section_data       => 1,
 			section_pre_data   => 1,
@@ -569,6 +578,17 @@ my %tests = (
 			schema_only      => 1,
 			section_pre_data => 1,
 		},
+	},
+
+	# Dumpable object inside specific schema
+	'INSERT INTO public.regress_table_dumpable VALUES (1);' => {
+		create_sql   => 'INSERT INTO public.regress_table_dumpable VALUES (1);',
+		regexp       => qr/^
+			\QINSERT INTO public.regress_table_dumpable VALUES (1);\E
+			\n/xm,
+		like => {
+			extension_schema => 1,
+		},
 	},);
 
 #########################################

src/test/modules/test_pg_dump/test_pg_dump--1.0.sql

@@ -13,6 +13,11 @@ CREATE SEQUENCE regress_pg_dump_seq;
 CREATE SEQUENCE regress_seq_dumpable;
 SELECT pg_catalog.pg_extension_config_dump('regress_seq_dumpable', '');
 
+CREATE TABLE regress_table_dumpable (
+	col1 int
+);
+SELECT pg_catalog.pg_extension_config_dump('regress_table_dumpable', '');
+
 CREATE SCHEMA regress_pg_dump_schema;
 
 GRANT USAGE ON regress_pg_dump_seq TO regress_dump_test_role;