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MWL#182: Explain running statements: address review feedback

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- switch SHOW EXPLAIN to using an INFORMATION_SCHEMA table.
This commit is contained in:
Sergey Petrunya
2012-07-10 21:23:00 +04:00
parent a931467e17
commit 725d76e1e8
11 changed files with 118 additions and 175 deletions
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82
sql/sql_class.cc
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@ -2309,90 +2309,16 @@ int select_send::send_data(List<Item> &items)
DBUG_RETURN(0);
}
//////////////////////////////////////////////////////////////////////////////
/*
Save the data being sent in our internal buffer.
*/
int select_result_explain_buffer::send_data(List<Item> &items)
{
List_iterator_fast<Item> li(items);
char buff[MAX_FIELD_WIDTH];
String buffer(buff, sizeof(buff), &my_charset_bin);
DBUG_ENTER("select_send::send_data");
protocol->prepare_for_resend();
Item *item;
while ((item=li++))
{
if (item->send(protocol, &buffer))
{
protocol->free(); // Free used buffer
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
break;
}
/*
Reset buffer to its original state, as it may have been altered in
Item::send().
*/
buffer.set(buff, sizeof(buff), &my_charset_bin);
}
if (thd->is_error())
{
protocol->remove_last_row();
DBUG_RETURN(1);
}
/*
Instead of calling protocol->write(), steal the packed and put it to our
buffer
*/
const char *packet_data;
size_t len;
protocol->get_packet(&packet_data, &len);
String *s= new (thd->mem_root) String;
s->append(packet_data, len);
data_rows.push_back(s);
protocol->remove_last_row(); // <-- this does nothing. Do we need it?
// prepare_for_resend() will wipe out the packet
DBUG_RETURN(0);
fill_record(thd, dst_table->field, items, TRUE, FALSE);
if ((dst_table->file->ha_write_tmp_row(dst_table->record[0])))
return 1;
return 0;
}
/* Write the saved resultset to the client (via this->protocol) and free it. */
void select_result_explain_buffer::flush_data()
{
List_iterator<String> it(data_rows);
String *str;
while ((str= it++))
{
protocol->set_packet(str->ptr(), str->length());
protocol->write();
delete str;
}
data_rows.empty();
}
/* Free the accumulated resultset */
void select_result_explain_buffer::discard_data()
{
List_iterator<String> it(data_rows);
String *str;
while ((str= it++))
{
delete str;
}
data_rows.empty();
}
//////////////////////////////////////////////////////////////////////////////
bool select_send::send_eof()
{
/*