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MDEV-17096 Pushdown of simple derived tables to storage engines

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MDEV-17631 select_handler for a full query pushdown

Interfaces + Proof of Concept for federatedx with test cases.

The interfaces have been developed for integration of ColumnStore engine.
This commit is contained in:
Igor Babaev
2018-10-09 02:36:09 -07:00
parent 171fbbb968
commit 16327fc2e7
21 changed files with 1279 additions and 20 deletions
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28
sql/sql_explain.cc
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@ -34,6 +34,9 @@ const char *unit_operation_text[4]=
"UNIT RESULT","UNION RESULT","INTERSECT RESULT","EXCEPT RESULT"
};
const char *pushed_derived_text= "PUSHED DERIVED";
const char *pushed_select_text= "PUSHED SELECT";
static void write_item(Json_writer *writer, Item *item);
static void append_item_to_str(String *out, Item *item);
@ -334,6 +337,9 @@ int print_explain_row(select_result_sink *result,
List<Item> item_list;
Item *item;
if (!select_type[0])
return 0;
item_list.push_back(new (mem_root) Item_int(thd, (int32) select_number),
mem_root);
item_list.push_back(new (mem_root) Item_string_sys(thd, select_type),
@ -746,7 +752,15 @@ int Explain_select::print_explain(Explain_query *query,
THD *thd= output->thd;
MEM_ROOT *mem_root= thd->mem_root;
if (message)
if (select_type == pushed_derived_text || select_type == pushed_select_text)
{
print_explain_message_line(output, explain_flags, is_analyze,
select_id /*select number*/,
select_type,
NULL, /* rows */
NULL);
}
else if (message)
{
List<Item> item_list;
Item *item_null= new (mem_root) Item_null(thd);
@ -869,14 +883,20 @@ void Explain_select::print_explain_json(Explain_query *query,
bool started_cache= print_explain_json_cache(writer, is_analyze);
if (message)
if (message ||
select_type == pushed_derived_text ||
select_type == pushed_select_text)
{
writer->add_member("query_block").start_object();
writer->add_member("select_id").add_ll(select_id);
add_linkage(writer);
writer->add_member("table").start_object();
writer->add_member("message").add_str(message);
writer->add_member("message").add_str(select_type == pushed_derived_text ?
"Pushed derived" :
select_type == pushed_select_text ?
"Pushed select" :
message);
writer->end_object();
print_explain_json_for_children(query, writer, is_analyze);
@ -1205,7 +1225,7 @@ int Explain_table_access::print_explain(select_result_sink *output, uint8 explai
{
THD *thd= output->thd;
MEM_ROOT *mem_root= thd->mem_root;
List<Item> item_list;
Item *item_null= new (mem_root) Item_null(thd);