MDEV-10309 COALESCE(12345678900) makes a column of a wrong type and truncates the data

Previous fixes in Type_handler
(see the patch for MDEV-12875, MDEV-12886, MDEV-12916)
fixed this problem as well. Adding only the test from the report.

mysql-test/r/func_hybrid_type.result

@@ -3557,5 +3557,19 @@ COALESCE(a)	int(11)	YES		NULL
 DROP VIEW v1;
 DROP TABLE t1;
 #
+# MDEV-10309 COALESCE(12345678900) makes a column of a wrong type and truncates the data
+#
+CREATE TABLE t1 AS SELECT 12345678900 AS c1, COALESCE(12345678900) AS c2;
+SELECT * FROM t1;
+c1	c2
+12345678900	12345678900
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c1` bigint(11) NOT NULL,
+  `c2` bigint(11) NOT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+#
 # End of 10.3 tests
 #

mysql-test/t/func_hybrid_type.test

@@ -544,6 +544,15 @@ DESCRIBE v1;
 DROP VIEW v1;
 DROP TABLE t1;
 
+--echo #
+--echo # MDEV-10309 COALESCE(12345678900) makes a column of a wrong type and truncates the data
+--echo #
+
+CREATE TABLE t1 AS SELECT 12345678900 AS c1, COALESCE(12345678900) AS c2;
+SELECT * FROM t1;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
 --echo #
 --echo # End of 10.3 tests
 --echo #