Adding tests for MDEV-12917 Wrong data type for CREATE..SELECT year_sp_variable

The fix for MDEV-12876 fixed this problem as well.
So adding tests only.

Author: Alexander Barkov

mysql-test/r/sp-vars.result

@@ -1187,6 +1187,9 @@ DROP PROCEDURE vctest;
 #
 # Start of 10.3 tests
 #
+#
+# MDEV-12876 Wrong data type for CREATE..SELECT sp_var
+#
 CREATE PROCEDURE p1()
 BEGIN
 DECLARE i8  TINYINT;
@@ -1221,3 +1224,20 @@ t3	mediumtext	YES		NULL
 t4	longtext	YES		NULL	
 DROP TABLE t1;
 DROP PROCEDURE p1;
+#
+# MDEV-12917 Wrong data type for CREATE..SELECT year_sp_variable
+#
+CREATE PROCEDURE p1()
+BEGIN
+DECLARE a YEAR;
+CREATE OR REPLACE TABLE t1 AS SELECT a;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+END;
+$$
+CALL p1;
+Table	Create Table
+t1	CREATE TABLE "t1" (
+  "a" year(4) DEFAULT NULL
+)
+DROP PROCEDURE p1;

mysql-test/t/sp-vars.test

@@ -1492,6 +1492,10 @@ DROP PROCEDURE vctest;
 --echo # Start of 10.3 tests
 --echo #
 
+--echo #
+--echo # MDEV-12876 Wrong data type for CREATE..SELECT sp_var
+--echo #
+
 DELIMITER $$;
 CREATE PROCEDURE p1()
 BEGIN
@@ -1515,3 +1519,20 @@ CALL p1;
 DESCRIBE t1;
 DROP TABLE t1;
 DROP PROCEDURE p1;
+
+--echo #
+--echo # MDEV-12917 Wrong data type for CREATE..SELECT year_sp_variable
+--echo #
+
+DELIMITER $$;
+CREATE PROCEDURE p1()
+BEGIN
+  DECLARE a YEAR;
+  CREATE OR REPLACE TABLE t1 AS SELECT a;
+  SHOW CREATE TABLE t1;
+  DROP TABLE t1;
+END;
+$$
+DELIMITER ;$$
+CALL p1;
+DROP PROCEDURE p1;