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MDEV-406: ANALYZE $stmt
- Ported the old patch to new explain code
- New SQL syntax (ANALYZE $stmt)
- ANALYZE UPDATE/DELETE is now supported (because EXPLAIN UPDATE/DELETE is supported)
- Basic counters are calculated for basic kinds of queries
  (still need to see what happens with join buffer, ORDER BY...LIMIT queries, etc)
This commit is contained in:
Sergei Petrunia
2014-05-27 20:13:17 +04:00
parent 5a61516afd
commit eaba1ba4a5
13 changed files with 239 additions and 58 deletions
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19
sql/sql_class.cc
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@@ -2282,6 +2282,9 @@ int THD::send_explain_fields(select_result *result)
/*
Populate the provided field_list with EXPLAIN output columns.
this->lex->describe has the EXPLAIN flags
The set/order of columns must be kept in sync with
Explain_query::print_explain and co.
*/
void THD::make_explain_field_list(List<Item> &field_list)
@@ -2317,11 +2320,25 @@ void THD::make_explain_field_list(List<Item> &field_list)
item->maybe_null=1;
field_list.push_back(item= new Item_return_int("rows", 10,
MYSQL_TYPE_LONGLONG));
if (lex->describe & DESCRIBE_EXTENDED)
if (lex->analyze_stmt)
{
field_list.push_back(item= new Item_return_int("r_rows", 10,
MYSQL_TYPE_LONGLONG));
item->maybe_null=1;
}
if (lex->analyze_stmt || lex->describe & DESCRIBE_EXTENDED)
{
field_list.push_back(item= new Item_float("filtered", 0.1234, 2, 4));
item->maybe_null=1;
}
if (lex->analyze_stmt)
{
field_list.push_back(item= new Item_float("r_filtered", 0.1234, 2, 4));
item->maybe_null=1;
}
item->maybe_null= 1;
field_list.push_back(new Item_empty_string("Extra", 255, cs));
}