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MDEV-16470 - Session user variables tracker

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Based on contribution by Dapeng Huang.
This commit is contained in:
Sergey Vojtovich 2019-06-20 18:02:40 +04:00
commit f5c3ad1913
16 changed files with 141 additions and 21 deletions
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33
sql/session_tracker.cc
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@ -16,7 +16,6 @@
#include "sql_plugin.h"
#include "hash.h"
#include "table.h"
#include "rpl_gtid.h"
#include "sql_class.h"
@ -1182,6 +1181,38 @@ bool Session_state_change_tracker::store(THD *thd, String *buf)
return false;
}
bool User_variables_tracker::update(THD *thd, set_var *)
{
m_enabled= thd->variables.session_track_user_variables;
return false;
}
bool User_variables_tracker::store(THD *thd, String *buf)
{
for (ulong i= 0; i < m_changed_user_variables.size(); i++)
{
auto var= m_changed_user_variables.at(i);
String value_str;
bool null_value;
var->val_str(&null_value, &value_str, DECIMAL_MAX_SCALE);
buf->q_append(static_cast<char>(SESSION_TRACK_USER_VARIABLES));
ulonglong length= net_length_size(var->name.length) + var->name.length;
if (!null_value)
length+= net_length_size(value_str.length()) + value_str.length();
buf->q_net_store_length(length);
buf->q_net_store_data(reinterpret_cast<const uchar*>(var->name.str),
var->name.length);
if (!null_value)
buf->q_net_store_data(reinterpret_cast<const uchar*>(value_str.ptr()),
value_str.length());
}
m_changed_user_variables.clear();
return false;
}
///////////////////////////////////////////////////////////////////////////////
/**