Bug#25629 CREATE TABLE LIKE does not work with INFORMATION_SCHEMA

added new func mysql_create_like_schema_frm() which creates frm file based on I_S table


mysql-test/r/create.result:
  test result
mysql-test/t/create.test:
  test case
sql/sql_table.cc:
  added new func mysql_create_like_schema_frm() which creates frm file based on I_S table

mysql-test/r/create.result

@@ -1705,4 +1705,42 @@ create table t1 as select 1;
 create table t2 as select f1() from t1;
 drop table t1,t2;
 drop function f1;
+create table t1 like information_schema.processlist;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `ID` bigint(4) NOT NULL DEFAULT '0',
+  `USER` varchar(16) NOT NULL DEFAULT '',
+  `HOST` varchar(64) NOT NULL DEFAULT '',
+  `DB` varchar(64) DEFAULT NULL,
+  `COMMAND` varchar(16) NOT NULL DEFAULT '',
+  `TIME` bigint(7) NOT NULL DEFAULT '0',
+  `STATE` varchar(64) DEFAULT NULL,
+  `INFO` longtext
+) ENGINE=MyISAM DEFAULT CHARSET=utf8
+drop table t1;
+create temporary table t1 like information_schema.processlist;
+show create table t1;
+Table	Create Table
+t1	CREATE TEMPORARY TABLE `t1` (
+  `ID` bigint(4) NOT NULL DEFAULT '0',
+  `USER` varchar(16) NOT NULL DEFAULT '',
+  `HOST` varchar(64) NOT NULL DEFAULT '',
+  `DB` varchar(64) DEFAULT NULL,
+  `COMMAND` varchar(16) NOT NULL DEFAULT '',
+  `TIME` bigint(7) NOT NULL DEFAULT '0',
+  `STATE` varchar(64) DEFAULT NULL,
+  `INFO` longtext
+) ENGINE=MyISAM DEFAULT CHARSET=utf8
+drop table t1;
+create table t1 like information_schema.character_sets;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `CHARACTER_SET_NAME` varchar(64) NOT NULL DEFAULT '',
+  `DEFAULT_COLLATE_NAME` varchar(64) NOT NULL DEFAULT '',
+  `DESCRIPTION` varchar(60) NOT NULL DEFAULT '',
+  `MAXLEN` bigint(3) NOT NULL DEFAULT '0'
+) ENGINE=MEMORY DEFAULT CHARSET=utf8
+drop table t1;
 End of 5.1 tests

mysql-test/t/create.test

@@ -1328,4 +1328,17 @@ create table t2 as select f1() from t1;
 drop table t1,t2;
 drop function f1;
 
+#
+# Bug#25629 CREATE TABLE LIKE does not work with INFORMATION_SCHEMA
+#
+create table t1 like information_schema.processlist;
+show create table t1;
+drop table t1;
+create temporary table t1 like information_schema.processlist;
+show create table t1;
+drop table t1;
+create table t1 like information_schema.character_sets;
+show create table t1;
+drop table t1;
+
 --echo End of 5.1 tests

sql/sql_table.cc

@@ -4565,6 +4565,55 @@ bool mysql_preload_keys(THD* thd, TABLE_LIST* tables)
 }
 
 
+
+/**
+  @brief          Create frm file based on I_S table
+
+  @param[in]      thd                      thread handler
+  @param[in]      schema_table             I_S table           
+  @param[in]      dst_path                 path where frm should be created
+  @param[in]      create_info              Create info
+
+  @return         Operation status
+    @retval       0                        success
+    @retval       1                        error
+*/
+
+
+bool mysql_create_like_schema_frm(THD* thd, TABLE_LIST* schema_table,
+                                  char *dst_path, HA_CREATE_INFO *create_info)
+{
+  HA_CREATE_INFO local_create_info;
+  Alter_info alter_info;
+  bool tmp_table= (create_info->options & HA_LEX_CREATE_TMP_TABLE);
+  uint keys= schema_table->table->s->keys;
+  uint db_options= 0;
+  DBUG_ENTER("mysql_create_like_schema_frm");
+
+  bzero((char*) &local_create_info, sizeof(local_create_info));
+  local_create_info.db_type= schema_table->table->s->db_type();
+  local_create_info.row_type= schema_table->table->s->row_type;
+  local_create_info.default_table_charset=default_charset_info;
+  alter_info.flags= (ALTER_CHANGE_COLUMN | ALTER_RECREATE);
+  schema_table->table->use_all_columns();
+  if (mysql_prepare_alter_table(thd, schema_table->table,
+                                &local_create_info, &alter_info))
+    DBUG_RETURN(1);
+  if (mysql_prepare_create_table(thd, &local_create_info, &alter_info,
+                                 tmp_table, &db_options,
+                                 schema_table->table->file,
+                                 &schema_table->table->s->key_info, &keys, 0))
+    DBUG_RETURN(1);
+  local_create_info.max_rows= 0;
+  if (mysql_create_frm(thd, dst_path, NullS, NullS,
+                       &local_create_info, alter_info.create_list,
+                       keys, schema_table->table->s->key_info,
+                       schema_table->table->file))
+    DBUG_RETURN(1);
+  DBUG_RETURN(0);
+}
+
+
 /*
   Create a table identical to the specified table
 
@@ -4668,7 +4717,15 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table, TABLE_LIST* src_table,
     during the call to ha_create_table(). See bug #28614 for more info.
   */
   VOID(pthread_mutex_lock(&LOCK_open));
-  if (my_copy(src_path, dst_path, MYF(MY_DONT_OVERWRITE_FILE)))
+  if (src_table->schema_table)
+  {
+    if (mysql_create_like_schema_frm(thd, src_table, dst_path, create_info))
+    {
+      VOID(pthread_mutex_unlock(&LOCK_open));
+      goto err;
+    }
+  }
+  else if (my_copy(src_path, dst_path, MYF(MY_DONT_OVERWRITE_FILE)))
   {
     if (my_errno == ENOENT)
       my_error(ER_BAD_DB_ERROR,MYF(0),db);