SQL: moved VTQ items to separate file

1 files changed, 140 insertions, 0 deletions

diff --git a/sql/item_vers.h b/sql/item_vers.h
new file mode 100644
index 00000000000..aa5575ff9b1
--- /dev/null
+++ b/sql/item_vers.h
@@ -0,0 +1,140 @@
+#ifndef ITEM_VERS_INCLUDED
+#define ITEM_VERS_INCLUDED
+/* Copyright (c) 2017, MariaDB Corporation.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA */
+
+
+/* System Versioning items */
+
+#include "vtq.h"
+
+#ifdef USE_PRAGMA_INTERFACE
+#pragma interface			/* gcc class implementation */
+#endif
+
+template <class Item_func_X>
+class VTQ_common : public Item_func_X
+{
+protected:
+  handlerton *hton;
+  void init_hton();
+public:
+  VTQ_common(THD *thd, Item* a) :
+    Item_func_X(thd, a),
+    hton(NULL) {}
+  VTQ_common(THD *thd, Item* a, Item* b) :
+    Item_func_X(thd, a, b),
+    hton(NULL) {}
+  VTQ_common(THD *thd, Item* a, handlerton* _hton) :
+    Item_func_X(thd, a),
+    hton(_hton) {}
+};
+
+class Item_func_vtq_ts :
+  public VTQ_common<Item_datetimefunc>
+{
+  vtq_field_t vtq_field;
+public:
+  Item_func_vtq_ts(THD *thd, Item* a, vtq_field_t _vtq_field, handlerton *hton);
+  Item_func_vtq_ts(THD *thd, Item* a, vtq_field_t _vtq_field);
+  const char *func_name() const
+  {
+    if (vtq_field == VTQ_BEGIN_TS)
+    {
+      return "vtq_begin_ts";
+    }
+    return "vtq_commit_ts";
+  }
+  bool get_date(MYSQL_TIME *res, ulonglong fuzzy_date);
+  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
+  { return get_item_copy<Item_func_vtq_ts>(thd, mem_root, this); }
+};
+
+class Item_func_vtq_id :
+  public VTQ_common<Item_int_func>
+{
+  vtq_field_t vtq_field;
+  vtq_record_t cached_result;
+  bool backwards;
+
+  longlong get_by_trx_id(ulonglong trx_id);
+  longlong get_by_commit_ts(MYSQL_TIME &commit_ts, bool backwards);
+
+public:
+  Item_func_vtq_id(THD *thd, Item* a, vtq_field_t _vtq_field, bool _backwards= false);
+  Item_func_vtq_id(THD *thd, Item* a, Item* b, vtq_field_t _vtq_field);
+
+  vtq_record_t *vtq_cached_result() { return &cached_result; }
+
+  const char *func_name() const
+  {
+    switch (vtq_field)
+    {
+    case VTQ_TRX_ID:
+      return "vtq_trx_id";
+    case VTQ_COMMIT_ID:
+        return "vtq_commit_id";
+    case VTQ_ISO_LEVEL:
+      return "vtq_iso_level";
+    default:
+      DBUG_ASSERT(0);
+    }
+    return NULL;
+  }
+
+  void fix_length_and_dec()
+  {
+    Item_int_func::fix_length_and_dec();
+    max_length= 20;
+  }
+
+  longlong val_int();
+  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
+  { return get_item_copy<Item_func_vtq_id>(thd, mem_root, this); }
+};
+
+class Item_func_vtq_trx_sees :
+  public VTQ_common<Item_bool_func>
+{
+protected:
+  bool accept_eq;
+
+public:
+  Item_func_vtq_trx_sees(THD *thd, Item* a, Item* b);
+  const char *func_name() const
+  {
+    return "vtq_trx_sees";
+  }
+  longlong val_int();
+  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
+  { return get_item_copy<Item_func_vtq_trx_sees>(thd, mem_root, this); }
+};
+
+class Item_func_vtq_trx_sees_eq :
+  public Item_func_vtq_trx_sees
+{
+public:
+  Item_func_vtq_trx_sees_eq(THD *thd, Item* a, Item* b) :
+    Item_func_vtq_trx_sees(thd, a, b)
+  {
+    accept_eq= true;
+  }
+  const char *func_name() const
+  {
+    return "vtq_trx_sees_eq";
+  }
+};
+
+#endif /* ITEM_VERS_INCLUDED */