MDEV-26: Global transaction ID. First alpha release.

Merge of 10.0-mdev26 feature tree into 10.0-base.

Global transaction ID is prepended to each event group in the binlog.

Slave connect can request to start from GTID position instead of specifying
file name/offset of master binlog. This facilitates easy switch to a new
master.

Slave GTID state is stored in a table mysql.rpl_slave_state, which can be
InnoDB to get crash-safe slave state.

GTID includes a replication domain ID, allowing to keep track of distinct
positions for each of multiple masters.

1 files changed, 41 insertions, 0 deletions

diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc
index a4ca4dbe5a0..93569082d74 100644
--- a/sql/item_strfunc.cc
+++ b/sql/item_strfunc.cc
@@ -59,6 +59,7 @@ C_MODE_START
 #include "../mysys/my_static.h"			// For soundex_map
 C_MODE_END
 #include "sql_show.h"                           // append_identifier
+#include <sql_repl.h>
 
 /**
    @todo Remove this. It is not safe to use a shared String object.
@@ -2668,6 +2669,46 @@ err:
 }
 
 
+void Item_func_binlog_gtid_pos::fix_length_and_dec()
+{
+  collation.set(system_charset_info);
+  max_length= MAX_BLOB_WIDTH;
+  maybe_null= 1;
+}
+
+
+String *Item_func_binlog_gtid_pos::val_str(String *str)
+{
+  DBUG_ASSERT(fixed == 1);
+#ifndef HAVE_REPLICATION
+  null_value= 0;
+  str->copy("", 0, system_charset_info);
+  return str;
+#else
+  String name_str, *name;
+  longlong pos;
+
+  if (args[0]->null_value || args[1]->null_value)
+    goto err;
+
+  name= args[0]->val_str(&name_str);
+  pos= args[1]->val_int();
+
+  if (pos < 0 || pos > UINT_MAX32)
+    goto err;
+
+  if (gtid_state_from_binlog_pos(name->c_ptr_safe(), (uint32)pos, str))
+    goto err;
+  null_value= 0;
+  return str;
+
+err:
+  null_value= 1;
+  return NULL;
+#endif  /* !HAVE_REPLICATION */
+}
+
+
 void Item_func_rpad::fix_length_and_dec()
 {
   // Handle character set for args[0] and args[2].