SQL: Truncate history of partitioned table [fixes #399, closes #403]

also, don't rotate versioning partitions for DELETE HISTORY

originally by: Aleksey Midenkov

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

@@ -45,15 +45,24 @@ call truncate_sp;
 select * from t for system_time all;
 a
 drop procedure truncate_sp;
-### Issue #399, truncate partitioned table is now unimplemented
+# Truncate partitioned
 create or replace table t (a int)
 with system versioning
 engine myisam
-partition by system_time (
+partition by system_time limit 1 (
 partition p0 history,
+partition p1 history,
 partition pn current);
+insert into t values (1);
+update t set a= 2;
+update t set a= 3;
+Warnings:
+Note	4114	Versioned table `test`.`t`: switching from partition `p0` to `p1`
 delete history from t;
-ERROR 42000: The used command is not allowed with this MariaDB version
+select * from t for system_time all;
+a
+3
+# VIEW
 create or replace table t (i int) with system versioning;
 delete history from t;
 create or replace view v as select * from t;

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

@@ -41,18 +41,21 @@ select * from t for system_time all;
 
 drop procedure truncate_sp;
 
---echo ### Issue #399, truncate partitioned table is now unimplemented
-
+--echo # Truncate partitioned
 create or replace table t (a int)
 with system versioning
 engine myisam
-partition by system_time (
+partition by system_time limit 1 (
     partition p0 history,
+    partition p1 history,
     partition pn current);
-
---error ER_NOT_ALLOWED_COMMAND
+insert into t values (1);
+update t set a= 2;
+update t set a= 3;
 delete history from t;
+select * from t for system_time all;
 
+--echo # VIEW
 create or replace table t (i int) with system versioning;
 delete history from t;
 create or replace view v as select * from t;

sql/ha_partition.cc

@@ -4474,11 +4474,18 @@ int ha_partition::delete_row(const uchar *buf)
 
     Notice that HA_READ_BEFORE_WRITE_REMOVAL does not require this protocol,
     so this is not supported for this engine.
+
+    For partitions by system_time, get_part_for_buf() is always either current
+    or last historical partition, but DELETE HISTORY can delete from any
+    historical partition. So, skip the check in this case.
   */
-  uint32 part_id;
-  error= get_part_for_buf(buf, m_rec0, m_part_info, &part_id);
-  DBUG_ASSERT(!error);
-  DBUG_ASSERT(part_id == m_last_part);
+  if (!thd->lex->vers_conditions) // if not DELETE HISTORY
+  {
+    uint32 part_id;
+    error= get_part_for_buf(buf, m_rec0, m_part_info, &part_id);
+    DBUG_ASSERT(!error);
+    DBUG_ASSERT(part_id == m_last_part);
+  }
   DBUG_ASSERT(bitmap_is_set(&(m_part_info->read_partitions), m_last_part));
   DBUG_ASSERT(bitmap_is_set(&(m_part_info->lock_partitions), m_last_part));
 #endif

sql/sql_delete.cc

@@ -317,14 +317,6 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
     TABLE *table= table_list->table;
     DBUG_ASSERT(table);
 
-#ifdef WITH_PARTITION_STORAGE_ENGINE
-    if (table->part_info)
-    {
-      my_error(ER_NOT_ALLOWED_COMMAND, MYF(0));
-      DBUG_RETURN(true);
-    }
-#endif
-
     DBUG_ASSERT(!conds || thd->stmt_arena->is_stmt_execute());
     if (select_lex->vers_setup_conds(thd, table_list, &conds))
       DBUG_RETURN(TRUE);

sql/sql_partition.cc

@@ -3112,6 +3112,8 @@ int vers_get_partition_id(partition_info *part_info,
     switch (thd->lex->sql_command)
     {
     case SQLCOM_DELETE:
+      if (thd->lex->vers_conditions)
+        break; // DELETE HISTORY
     case SQLCOM_DELETE_MULTI:
     case SQLCOM_UPDATE:
     case SQLCOM_UPDATE_MULTI: