MDEV-9147: Character set is ignored in Dynamic Column for saved string

Fixed moving charset from definition to the value.

mysql-test/r/dyncol.result

@@ -6,16 +6,16 @@ hex(COLUMN_CREATE(1, NULL AS char character set utf8))
 000000
 select hex(COLUMN_CREATE(1, "afaf" AS char character set utf8));
 hex(COLUMN_CREATE(1, "afaf" AS char character set utf8))
-0001000100030861666166
+0001000100032161666166
 select hex(COLUMN_CREATE(1, 1212 AS char character set utf8));
 hex(COLUMN_CREATE(1, 1212 AS char character set utf8))
-0001000100030831323132
+0001000100032131323132
 select hex(COLUMN_CREATE(1, 12.12 AS char character set utf8));
 hex(COLUMN_CREATE(1, 12.12 AS char character set utf8))
-0001000100030831322E3132
+0001000100032131322E3132
 select hex(COLUMN_CREATE(1, 99999999999999999999999999999 AS char character set utf8));
 hex(COLUMN_CREATE(1, 99999999999999999999999999999 AS char character set utf8))
-000100010003083939393939393939393939393939393939393939393939393939393939
+000100010003213939393939393939393939393939393939393939393939393939393939
 select hex(COLUMN_CREATE(1, NULL AS unsigned int));
 hex(COLUMN_CREATE(1, NULL AS unsigned int))
 000000
@@ -144,7 +144,7 @@ hex(COLUMN_CREATE(1, "afaf" AS char character set utf8,
 6, "2011-04-05" AS date,
 7, "- 0:45:49.000001" AS time,
 8, "2011-04-05 0:45:49.000001" AS datetime))
-01080001000300020029000300380004004A0005008C000600AE000700C7000800F5000861666166BC0478093D0AD7A3703D284002028C0C85B60F010010B7000485B60F010010B70000
+01080001000300020029000300380004004A0005008C000600AE000700C7000800F5002161666166BC0478093D0AD7A3703D284002028C0C85B60F010010B7000485B60F010010B70000
 explain extended
 select hex(COLUMN_CREATE(1, "afaf" AS char character set utf8,
 2, 1212 AS unsigned int,
@@ -1848,5 +1848,15 @@ select column_json(column_create('float', 1.23456789012345E+10 as double));
 column_json(column_create('float', 1.23456789012345E+10 as double))
 {"float":12345678901.2345}
 #
+# MDEV-9147: Character set is ignored in Dynamic Column for saved string
+#
+SET NAMES utf8;
+SELECT COLUMN_GET(COLUMN_CREATE(1, 0xC2A2 AS CHAR CHARACTER SET latin1), 1 AS CHAR CHARACTER SET utf8) AS a;
+a
+¢
+SELECT COLUMN_GET(COLUMN_CREATE(1, 0xC2A2 AS CHAR CHARACTER SET utf8), 1 AS CHAR CHARACTER SET utf8) AS a;
+a
+¢
+#
 # end of 10.0 tests
 #

mysql-test/t/dyncol.test

@@ -901,6 +901,13 @@ select column_get(column_create('float', 1.23456789012345E+100 as double), 'floa
 select column_json(column_create('float', 1.23456789012345E+100 as double)); 
 select column_json(column_create('float', 1.23456789012345E+10 as double));
 
+--echo #
+--echo # MDEV-9147: Character set is ignored in Dynamic Column for saved string
+--echo #
+SET NAMES utf8;
+SELECT COLUMN_GET(COLUMN_CREATE(1, 0xC2A2 AS CHAR CHARACTER SET latin1), 1 AS CHAR CHARACTER SET utf8) AS a;
+SELECT COLUMN_GET(COLUMN_CREATE(1, 0xC2A2 AS CHAR CHARACTER SET utf8), 1 AS CHAR CHARACTER SET utf8) AS a; 
+
 --echo #
 --echo # end of 10.0 tests
 --echo #

sql/item_strfunc.cc

@@ -4448,6 +4448,8 @@ bool Item_func_dyncol_create::prepare_arguments(bool force_names_arg)
     case DYN_COL_DYNCOL:
     case DYN_COL_STRING:
       res= args[valpos]->val_str(&tmp);
+      if (res && defs[i].cs)
+        res->set_charset(defs[i].cs);
       if (res &&
           (vals[i].x.string.value.str= sql_strmake(res->ptr(), res->length())))
       {