Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 167 insertions, 0 deletions

diff --git a/sql/sql_sequence.h b/sql/sql_sequence.h
new file mode 100644
index 00000000..29c589e6
--- /dev/null
+++ b/sql/sql_sequence.h
@@ -0,0 +1,167 @@
+/* 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 St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef SQL_SEQUENCE_INCLUDED
+#define SQL_SEQUENCE_INCLUDED
+
+#define seq_field_used_min_value 1
+#define seq_field_used_max_value 2
+#define seq_field_used_start     4
+#define seq_field_used_increment 8
+#define seq_field_used_cache     16
+#define seq_field_used_cycle     32
+#define seq_field_used_restart   64
+#define seq_field_used_restart_value 128
+
+/* Field position in sequence table for some fields we refer to directly */
+#define NEXT_FIELD_NO 0
+#define MIN_VALUE_FIELD_NO 1
+#define ROUND_FIELD_NO 7
+
+/**
+   sequence_definition is used when defining a sequence as part of create
+*/
+
+class sequence_definition :public Sql_alloc
+{
+public:
+  sequence_definition():
+    min_value(1), max_value(LONGLONG_MAX-1), start(1), increment(1),
+      cache(1000), round(0), restart(0), cycle(0), used_fields(0)
+  {}
+  longlong reserved_until;
+  longlong min_value;
+  longlong max_value;
+  longlong start;
+  longlong increment;
+  longlong cache;
+  ulonglong round;
+  longlong restart;              // alter sequence restart value
+  bool     cycle;
+  uint used_fields;              // Which fields where used in CREATE
+
+  bool check_and_adjust(bool set_reserved_until);
+  void store_fields(TABLE *table);
+  void read_fields(TABLE *table);
+  int write_initial_sequence(TABLE *table);
+  int write(TABLE *table, bool all_fields);
+  /* This must be called after sequence data has been updated */
+  void adjust_values(longlong next_value);
+  inline void print_dbug()
+  {
+    DBUG_PRINT("sequence", ("reserved: %lld  start: %lld  increment: %lld  min_value: %lld  max_value: %lld  cache: %lld  round: %lld",
+                      reserved_until, start, increment, min_value,
+                        max_value, cache, round));
+  }
+protected:
+  /*
+    The following values are the values from sequence_definition
+    merged with global auto_increment_offset and auto_increment_increment
+  */
+  longlong real_increment;
+  longlong next_free_value;
+};
+
+/**
+  SEQUENCE is in charge of managing the sequence values.
+  It's also responsible to generate new values and updating the sequence
+  table (engine=SQL_SEQUENCE) trough it's specialized handler interface.
+
+  If increment is 0 then the sequence will be be using
+  auto_increment_increment and auto_increment_offset variables, just like
+  AUTO_INCREMENT is using.
+*/
+
+class SEQUENCE :public sequence_definition
+{
+public:
+  enum seq_init { SEQ_UNINTIALIZED, SEQ_IN_PREPARE, SEQ_IN_ALTER,
+                  SEQ_READY_TO_USE };
+  SEQUENCE();
+  ~SEQUENCE();
+  int  read_initial_values(TABLE *table);
+  int  read_stored_values(TABLE *table);
+  void write_lock(TABLE *table);
+  void write_unlock(TABLE *table);
+  void read_lock(TABLE *table);
+  void read_unlock(TABLE *table);
+  void copy(sequence_definition *seq)
+  {
+    sequence_definition::operator= (*seq);
+    adjust_values(reserved_until);
+    all_values_used= 0;
+  }
+  longlong next_value(TABLE *table, bool second_round, int *error);
+  int set_value(TABLE *table, longlong next_value, ulonglong round_arg,
+                bool is_used);
+  longlong increment_value(longlong value)
+  {
+    if (real_increment > 0)
+    {
+      if (value > max_value - real_increment ||
+          value + real_increment > max_value)
+        value= max_value + 1;
+      else
+        value+= real_increment;
+    }
+    else
+    {
+      if (value + real_increment < min_value ||
+          value < min_value - real_increment)
+        value= min_value - 1;
+      else
+        value+= real_increment;
+    }
+    return value;
+  }
+
+  bool all_values_used;
+  seq_init initialized;
+
+private:
+  mysql_rwlock_t mutex;
+};
+
+
+/**
+  Class to cache last value of NEXT VALUE from the sequence
+*/
+
+class SEQUENCE_LAST_VALUE
+{
+public:
+  SEQUENCE_LAST_VALUE(uchar *key_arg, uint length_arg)
+    :key(key_arg), length(length_arg)
+  {}
+  ~SEQUENCE_LAST_VALUE()
+  { my_free((void*) key); }
+  /* Returns 1 if table hasn't been dropped or re-created */
+  bool check_version(TABLE *table);
+  void set_version(TABLE *table);
+
+  const uchar *key;
+  uint length;
+  bool null_value;
+  longlong value;
+  uchar table_version[MY_UUID_SIZE];
+};
+
+
+class Create_field;
+extern bool prepare_sequence_fields(THD *thd, List<Create_field> *fields);
+extern bool check_sequence_fields(LEX *lex, List<Create_field> *fields);
+extern bool sequence_insert(THD *thd, LEX *lex, TABLE_LIST *table_list);
+#endif /* SQL_SEQUENCE_INCLUDED */