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MDEV-3798: [SHOW] EXPLAIN UPDATE/DELETE

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- Merge with 10.0-base
This commit is contained in:
Sergey Petrunya
2013-10-15 11:51:41 +04:00
parent eb2c6f4513 25d0175fde
commit 1e36cbfa39
71 changed files with 8292 additions and 713 deletions
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84
sql/sql_show.cc
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@ -2345,8 +2345,8 @@ void Show_explain_request::call_in_target_thread()
DBUG_ASSERT(current_thd == target_thd);
set_current_thd(request_thd);
if (target_thd->lex->unit.print_explain(explain_buf, 0 /* explain flags*/,
&printed_anything))
if (target_thd->lex->print_explain(explain_buf, 0 /* explain flags*/,
&printed_anything))
{
failed_to_produce= TRUE;
}
@ -2377,6 +2377,86 @@ int select_result_explain_buffer::send_data(List<Item> &items)
DBUG_RETURN(test(res));
}
bool select_result_text_buffer::send_result_set_metadata(List<Item> &fields, uint flag)
{
n_columns= fields.elements;
return append_row(fields, true /*send item names */);
return send_data(fields);
}
int select_result_text_buffer::send_data(List<Item> &items)
{
return append_row(items, false /*send item values */);
}
int select_result_text_buffer::append_row(List<Item> &items, bool send_names)
{
List_iterator<Item> it(items);
Item *item;
char **row;
int column= 0;
if (!(row= (char**) thd->alloc(sizeof(char*) * n_columns)))
return true;
rows.push_back(row);
while ((item= it++))
{
DBUG_ASSERT(column < n_columns);
StringBuffer<32> buf;
const char *data_ptr;
size_t data_len;
if (send_names)
{
data_ptr= item->name;
data_len= strlen(item->name);
}
else
{
String *res;
res= item->val_str(&buf);
if (item->null_value)
{
data_ptr= "NULL";
data_len=4;
}
else
{
data_ptr= res->c_ptr_safe();
data_len= res->length();
}
}
char *ptr= (char*)thd->alloc(data_len + 1);
memcpy(ptr, data_ptr, data_len + 1);
row[column]= ptr;
column++;
}
return false;
}
void select_result_text_buffer::save_to(String *res)
{
List_iterator<char*> it(rows);
char **row;
res->append("#\n");
while ((row= it++))
{
res->append("# ");
for (int i=0; i < n_columns; i++)
{
if (i)
res->append('\t');
res->append(row[i]);
}
res->append("\n");
}
res->append("#\n");
}
/*
Store the SHOW EXPLAIN output in the temporary table.