MDEV-15966 Behavior for TRUNCATE versioned table is not documented and not covered by tests

* add error for truncation of versioned tables: `ER_TRUNCATE_ILLEGAL_VERS`
* make a full table open with `tdc_aquire_share` instead of just `ha_table_exists` check
test suites run: main, parts, versioning

Closes #785

mysql-test/suite/federated/federatedx_versioning.result

@@ -46,8 +46,12 @@ x	check_row(row_start, row_end)
 4	HISTORICAL ROW
 select * from tf;
 x
-# TRUNCATE
+# MDEV-15966: Behavior for TRUNCATE versioned table is not documented
+# and not covered by tests
+# As of standard, TRUNCATE on versioned tables is forbidden
 truncate tf;
+ERROR HY000: Got error 10000 'Error on remote system: 4160: Cannot truncate a versioned table' from FEDERATED
+delete history from t1;
 select * from t1 for system_time all;
 x
 # REPLACE
@@ -81,8 +85,10 @@ x	check_row(row_start, row_end)
 3	HISTORICAL ROW
 4	HISTORICAL ROW
 # multi-UPDATE
-truncate t1;
-truncate t2;
+delete from t1;
+delete history from t1;
+delete from t2;
+delete history from t2;
 insert into t1 values (1);
 insert into t2 values (2, 2);
 update tf, t2f set tf.x= 11, t2f.y= 22;

mysql-test/suite/federated/federatedx_versioning.test

@@ -32,8 +32,13 @@ select *, check_row(row_start, row_end) from t1 for system_time all
 order by x;
 select * from tf;
 
---echo # TRUNCATE
+--echo # MDEV-15966: Behavior for TRUNCATE versioned table is not documented
+--echo # and not covered by tests
+--echo # As of standard, TRUNCATE on versioned tables is forbidden
+--error ER_GET_ERRMSG
 truncate tf;
+
+delete history from t1;
 select * from t1 for system_time all;
 
 --echo # REPLACE
@@ -62,8 +67,10 @@ select *, check_row(row_start, row_end) from t1 for system_time all
 order by x;
 
 --echo # multi-UPDATE
-truncate t1;
-truncate t2;
+delete from t1;
+delete history from t1;
+delete from t2;
+delete history from t2;
 insert into t1 values (1);
 insert into t2 values (2, 2);
 update tf, t2f set tf.x= 11, t2f.y= 22;

mysql-test/suite/versioning/r/partition.result

@@ -396,14 +396,6 @@ for each row select count(*) from t1 into @a;
 Warnings:
 Warning	1287	'<select expression> INTO <destination>;' is deprecated and will be removed in a future release. Please use 'SELECT <select list> INTO <destination> FROM...' instead
 insert into t2 values (1);
-# MDEV-14741 Assertion `(trx)->start_file == 0' failed in row_truncate_table_for_mysql()
-create or replace table t1 (i int) with system versioning
-partition by system_time interval 1 hour (
-partition p1 history,
-partition pn current);
-set autocommit= off;
-truncate table t1;
-set autocommit= on;
 # MDEV-14747 ALTER PARTITION BY SYSTEM_TIME after LOCK TABLES
 create or replace table t1 (x int) with system versioning;
 lock table t1 write;

mysql-test/suite/versioning/r/truncate.result

@@ -106,5 +106,29 @@ call pr;
 call pr;
 drop procedure pr;
 drop table t1;
+# MDEV-15966 Behavior for TRUNCATE versioned table is not documented and not covered by tests
+create or replace table t1 (id int);
+create or replace table t2 (id int) with system versioning;
+# force cleaning table shares
+flush tables t1, t2;
+truncate table t1;
+truncate table t2;
+ERROR HY000: Cannot truncate a versioned table
+# fetch table shares
+describe t1;
+Field	Type	Null	Key	Default	Extra
+id	int(11)	YES		NULL	
+describe t2;
+Field	Type	Null	Key	Default	Extra
+id	int(11)	YES		NULL	
+truncate table t1;
+truncate table t2;
+ERROR HY000: Cannot truncate a versioned table
+# enter locked tables mode
+lock tables t1 WRITE, t2 WRITE;
+truncate t1;
+truncate t2;
+ERROR HY000: Cannot truncate a versioned table
+unlock tables;
 drop database test;
 create database test;

mysql-test/suite/versioning/t/partition.test

@@ -341,15 +341,6 @@ create or replace trigger tr before insert on t2
 for each row select count(*) from t1 into @a;
 insert into t2 values (1);
 
---echo # MDEV-14741 Assertion `(trx)->start_file == 0' failed in row_truncate_table_for_mysql()
-create or replace table t1 (i int) with system versioning
-partition by system_time interval 1 hour (
-  partition p1 history,
-  partition pn current);
-set autocommit= off;
-truncate table t1;
-set autocommit= on;
-
 --echo # MDEV-14747 ALTER PARTITION BY SYSTEM_TIME after LOCK TABLES
 create or replace table t1 (x int) with system versioning;
 lock table t1 write;

mysql-test/suite/versioning/t/truncate.test

@@ -117,5 +117,33 @@ call pr;
 drop procedure pr;
 drop table t1;
 
+--echo # MDEV-15966 Behavior for TRUNCATE versioned table is not documented and not covered by tests
+create or replace table t1 (id int);
+create or replace table t2 (id int) with system versioning;
+
+-- echo  # force cleaning table shares
+flush tables t1, t2;
+
+truncate table t1;
+--error ER_TRUNCATE_ILLEGAL_VERS
+truncate table t2;
+
+-- echo # fetch table shares
+describe t1;
+describe t2;
+
+truncate table t1;
+--error ER_TRUNCATE_ILLEGAL_VERS
+truncate table t2;
+
+--echo # enter locked tables mode
+lock tables t1 WRITE, t2 WRITE;
+
+truncate t1;
+--error ER_TRUNCATE_ILLEGAL_VERS
+truncate t2;
+
+unlock tables;
+
 drop database test;
 create database test;

sql/share/errmsg-utf8.txt

@@ -7931,3 +7931,5 @@ ER_PERIOD_CONSTRAINT_DROP
         eng "Can't DROP CONSTRAINT `%s`. Use DROP PERIOD `%s` for this"
 ER_TOO_LONG_KEYPART 42000 S1009
         eng "Specified key part was too long; max key part length is %u bytes"
+ER_TRUNCATE_ILLEGAL_VERS
+        eng "Cannot truncate a versioned table"

sql/sql_truncate.cc

@@ -275,6 +275,9 @@ Sql_cmd_truncate_table::handler_truncate(THD *thd, TABLE_LIST *table_ref,
 bool Sql_cmd_truncate_table::lock_table(THD *thd, TABLE_LIST *table_ref,
                                         bool *hton_can_recreate)
 {
+  handlerton *hton;
+  bool versioned;
+  bool sequence= false;
   TABLE *table= NULL;
   DBUG_ENTER("Sql_cmd_truncate_table::lock_table");
 
@@ -302,43 +305,43 @@ bool Sql_cmd_truncate_table::lock_table(THD *thd, TABLE_LIST *table_ref,
                                             table_ref->table_name.str, NULL)))
       DBUG_RETURN(TRUE);
 
-    *hton_can_recreate= ha_check_storage_engine_flag(table->file->ht,
-                                                     HTON_CAN_RECREATE);
+    versioned= table->versioned();
+    hton= table->file->ht;
     table_ref->mdl_request.ticket= table->mdl_ticket;
   }
   else
   {
-    handlerton *hton;
-    bool is_sequence;
-
-    /* Acquire an exclusive lock. */
     DBUG_ASSERT(table_ref->next_global == NULL);
     if (lock_table_names(thd, table_ref, NULL,
                          thd->variables.lock_wait_timeout, 0))
       DBUG_RETURN(TRUE);
 
-    if (!ha_table_exists(thd, &table_ref->db, &table_ref->table_name,
-                         &hton, &is_sequence) ||
-        hton == view_pseudo_hton)
+    TABLE_SHARE *share= tdc_acquire_share(thd, table_ref, GTS_TABLE | GTS_VIEW);
+    if (share == NULL)
+      DBUG_RETURN(TRUE);
+    DBUG_ASSERT(share != (TABLE_SHARE*)1);
+
+    versioned= share->versioned;
+    sequence= share->table_type == TABLE_TYPE_SEQUENCE;
+    hton= share->db_type();
+
+    tdc_release_share(share);
+
+    if (hton == view_pseudo_hton)
     {
       my_error(ER_NO_SUCH_TABLE, MYF(0), table_ref->db.str,
                table_ref->table_name.str);
       DBUG_RETURN(TRUE);
     }
+  }
+
+  *hton_can_recreate= !sequence
+                      && ha_check_storage_engine_flag(hton, HTON_CAN_RECREATE);
 
-    if (!hton)
+  if (versioned)
   {
-      /*
-        The table exists, but its storage engine is unknown, perhaps not
-        loaded at the moment. We need to open and parse the frm to know the
-        storage engine in question, so let's proceed with the truncation and
-        try to open the table. This will produce the correct error message
-        about unknown engine.
-      */
-      *hton_can_recreate= false;
-    }
-    else
-      *hton_can_recreate= !is_sequence && hton->flags & HTON_CAN_RECREATE;
+    my_error(ER_TRUNCATE_ILLEGAL_VERS, MYF(0));
+    DBUG_RETURN(TRUE);
   }
 
   /*