fix for bug#12913

(Simple SQL can crash server or connection)
(not initialized member leads to server crash)

mysql-test/r/create.result

@@ -587,6 +587,11 @@ DESC t2;
 Field	Type	Null	Key	Default	Extra
 f2	varchar(86)	YES		NULL	
 DROP TABLE t1,t2;
+CREATE TABLE t12913 (f1 ENUM ('a','b')) AS SELECT 'a' AS f1;
+SELECT * FROM t12913;
+f1
+a
+DROP TABLE t12913;
 create database mysqltest;
 use mysqltest;
 drop database mysqltest;

mysql-test/t/create.test

@@ -501,6 +501,13 @@ AS f2 FROM t1;
 DESC t2;
 DROP TABLE t1,t2;
 
+#
+# Bug#12913 Simple SQL can crash server or connection
+#
+CREATE TABLE t12913 (f1 ENUM ('a','b')) AS SELECT 'a' AS f1;
+SELECT * FROM t12913;
+DROP TABLE t12913;
+
 #
 # Bug#11028: Crash on create table like
 #

sql/sql_table.cc

@@ -649,6 +649,7 @@ int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
 	  sql_field->decimals=		dup_field->decimals;
 	  sql_field->flags=		dup_field->flags;
 	  sql_field->unireg_check=	dup_field->unireg_check;
+          sql_field->interval=          dup_field->interval;
 	  it2.remove();			// Remove first (create) definition
 	  select_field_pos--;
 	  break;