diff --git a/mysql-test/main/information_schema.result b/mysql-test/main/information_schema.result
index 60ea49f25ab..fcc437f8c60 100644
--- a/mysql-test/main/information_schema.result
+++ b/mysql-test/main/information_schema.result
@@ -2218,3 +2218,72 @@ SCHEMA_NAME
 #
 # End of 10.1 tests
 #
+#
+# MDEV-21201:No records produced in information_schema query,
+# depending on projection
+#
+create table t (i int, constraint a check (i > 0));
+select
+tc.TABLE_SCHEMA,
+tc.TABLE_NAME,
+cc.CONSTRAINT_NAME,
+cc.CHECK_CLAUSE
+from information_schema.TABLE_CONSTRAINTS tc
+join information_schema.CHECK_CONSTRAINTS cc
+using (CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, TABLE_NAME, CONSTRAINT_NAME)
+;
+TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_NAME	CHECK_CLAUSE
+mysql	global_priv	Priv	json_valid(`Priv`)
+test	t	a	`i` > 0
+select
+tc.TABLE_SCHEMA,
+tc.TABLE_NAME,
+cc.CONSTRAINT_NAME,
+cc.CHECK_CLAUSE
+from information_schema.CHECK_CONSTRAINTS cc
+join information_schema.TABLE_CONSTRAINTS tc
+using (CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, TABLE_NAME, CONSTRAINT_NAME)
+;
+TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_NAME	CHECK_CLAUSE
+mysql	global_priv	Priv	json_valid(`Priv`)
+test	t	a	`i` > 0
+select
+tc.TABLE_SCHEMA,
+tc.TABLE_NAME,
+cc.CONSTRAINT_NAME,
+cc.CHECK_CLAUSE
+from information_schema.TABLE_CONSTRAINTS tc
+NATURAL join information_schema.CHECK_CONSTRAINTS cc
+;
+TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_NAME	CHECK_CLAUSE
+mysql	global_priv	Priv	json_valid(`Priv`)
+test	t	a	`i` > 0
+select
+tc.TABLE_SCHEMA,
+tc.TABLE_NAME,
+cc.CONSTRAINT_NAME,
+cc.CHECK_CLAUSE
+from information_schema.CHECK_CONSTRAINTS cc
+NATURAL join information_schema.TABLE_CONSTRAINTS tc
+;
+TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_NAME	CHECK_CLAUSE
+mysql	global_priv	Priv	json_valid(`Priv`)
+test	t	a	`i` > 0
+select
+tc.TABLE_SCHEMA,
+tc.TABLE_NAME,
+cc.CONSTRAINT_NAME,
+cc.CHECK_CLAUSE,
+tc.CONSTRAINT_CATALOG,
+tc.CONSTRAINT_SCHEMA
+from information_schema.TABLE_CONSTRAINTS tc
+join information_schema.CHECK_CONSTRAINTS cc
+using (CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, TABLE_NAME, CONSTRAINT_NAME)
+;
+TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_NAME	CHECK_CLAUSE	CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA
+mysql	global_priv	Priv	json_valid(`Priv`)	def	mysql
+test	t	a	`i` > 0	def	test
+drop table t;
+#
+# End of 10.3 tests
+#
diff --git a/mysql-test/main/information_schema.test b/mysql-test/main/information_schema.test
index 1df0d3f635f..a3231d94349 100644
--- a/mysql-test/main/information_schema.test
+++ b/mysql-test/main/information_schema.test
@@ -1920,3 +1920,70 @@ SELECT SCHEMA_NAME from information_schema.schemata where schema_name=REPEAT('a'
 --echo #
 --echo # End of 10.1 tests
 --echo #
+
+
+--echo #
+--echo # MDEV-21201:No records produced in information_schema query,
+--echo # depending on projection
+--echo #
+
+create table t (i int, constraint a check (i > 0));
+
+--disable_warnings
+--sorted_result
+select
+  tc.TABLE_SCHEMA,
+  tc.TABLE_NAME,
+  cc.CONSTRAINT_NAME,
+  cc.CHECK_CLAUSE
+from information_schema.TABLE_CONSTRAINTS tc
+  join information_schema.CHECK_CONSTRAINTS cc
+    using (CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, TABLE_NAME, CONSTRAINT_NAME)
+;
+--sorted_result
+select
+  tc.TABLE_SCHEMA,
+  tc.TABLE_NAME,
+  cc.CONSTRAINT_NAME,
+  cc.CHECK_CLAUSE
+from information_schema.CHECK_CONSTRAINTS cc
+  join information_schema.TABLE_CONSTRAINTS tc
+    using (CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, TABLE_NAME, CONSTRAINT_NAME)
+;
+--sorted_result
+select
+  tc.TABLE_SCHEMA,
+  tc.TABLE_NAME,
+  cc.CONSTRAINT_NAME,
+  cc.CHECK_CLAUSE
+from information_schema.TABLE_CONSTRAINTS tc
+  NATURAL join information_schema.CHECK_CONSTRAINTS cc
+;
+--sorted_result
+select
+  tc.TABLE_SCHEMA,
+  tc.TABLE_NAME,
+  cc.CONSTRAINT_NAME,
+  cc.CHECK_CLAUSE
+from information_schema.CHECK_CONSTRAINTS cc
+  NATURAL join information_schema.TABLE_CONSTRAINTS tc
+;
+--sorted_result
+select
+  tc.TABLE_SCHEMA,
+  tc.TABLE_NAME,
+  cc.CONSTRAINT_NAME,
+  cc.CHECK_CLAUSE,
+  tc.CONSTRAINT_CATALOG,
+  tc.CONSTRAINT_SCHEMA
+from information_schema.TABLE_CONSTRAINTS tc
+  join information_schema.CHECK_CONSTRAINTS cc
+    using (CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, TABLE_NAME, CONSTRAINT_NAME)
+;
+--enable_warnings
+
+drop table t;
+
+--echo #
+--echo # End of 10.3 tests
+--echo #
diff --git a/mysql-test/suite/innodb/r/truncate_foreign.result b/mysql-test/suite/innodb/r/truncate_foreign.result
index bcf5b16aa83..fc09b74d62f 100644
--- a/mysql-test/suite/innodb/r/truncate_foreign.result
+++ b/mysql-test/suite/innodb/r/truncate_foreign.result
@@ -29,6 +29,7 @@ SET DEBUG_SYNC='foreign_constraint_check_for_update SIGNAL fk WAIT_FOR go';
 DELETE FROM parent;
 connection default;
 SET DEBUG_SYNC='now WAIT_FOR fk';
+SET lock_wait_timeout=1;
 TRUNCATE TABLE child;
 ERROR HY000: Lock wait timeout exceeded; try restarting transaction
 SET DEBUG_SYNC='now SIGNAL go';
diff --git a/mysql-test/suite/innodb/t/truncate_foreign.test b/mysql-test/suite/innodb/t/truncate_foreign.test
index 2c00c0641e9..d9d647e69f0 100644
--- a/mysql-test/suite/innodb/t/truncate_foreign.test
+++ b/mysql-test/suite/innodb/t/truncate_foreign.test
@@ -37,6 +37,7 @@ send DELETE FROM parent;
 
 connection default;
 SET DEBUG_SYNC='now WAIT_FOR fk';
+SET lock_wait_timeout=1;
 --error ER_LOCK_WAIT_TIMEOUT
 TRUNCATE TABLE child;
 SET DEBUG_SYNC='now SIGNAL go';
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 6862610537a..51109f128d0 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -9088,6 +9088,8 @@ void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields,
                       SELECT_LEX *lex)
 {
   b->natural_join= a;
+  a->part_of_natural_join= TRUE;
+  b->part_of_natural_join= TRUE;
   lex->prev_join_using= using_fields;
 }
 
diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index f72aa23a381..77ebc58bc02 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -8126,7 +8126,10 @@ TABLE *create_schema_table(THD *thd, TABLE_LIST *table_list)
   else
     all_items= thd->free_list;
 
-  mark_all_fields_used_in_query(thd, fields_info, &bitmap, all_items);
+  if (table_list->part_of_natural_join)
+    bitmap_set_all(&bitmap);
+  else
+    mark_all_fields_used_in_query(thd, fields_info, &bitmap, all_items);
 
   TMP_TABLE_PARAM *tmp_table_param = new (thd->mem_root) TMP_TABLE_PARAM;
   tmp_table_param->init();
diff --git a/sql/table.h b/sql/table.h
index 6f3620de83f..7ce6db5b193 100644
--- a/sql/table.h
+++ b/sql/table.h
@@ -2237,6 +2237,7 @@ struct TABLE_LIST
     parsing 'this' is a NATURAL/USING join iff (natural_join != NULL).
   */
   TABLE_LIST *natural_join;
+  bool part_of_natural_join;
   /*
     True if 'this' represents a nested join that is a NATURAL JOIN.
     For one of the operands of 'this', the member 'natural_join' points