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MDEV-10141: Add support for INTERSECT (and common parts for EXCEPT)

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MDEV-10140: Add support for EXCEPT
This commit is contained in:
Oleksandr Byelkin
2017-03-14 11:52:00 +01:00
parent e43156e1a6
commit 05d3c3d3f7
93 changed files with 3155 additions and 900 deletions
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53
sql/sql_explain.cc
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@ -29,6 +29,11 @@ const char * STR_DELETING_ALL_ROWS= "Deleting all rows";
const char * STR_IMPOSSIBLE_WHERE= "Impossible WHERE";
const char * STR_NO_ROWS_AFTER_PRUNING= "No matching rows after partition pruning";
const char *unit_operation_text[4]=
{
"UNIT RESULT","UNION RESULT","INTERSECT RESULT","EXCEPT RESULT"
};
static void write_item(Json_writer *writer, Item *item);
static void append_item_to_str(String *out, Item *item);
@ -418,8 +423,26 @@ int print_explain_row(select_result_sink *result,
uint Explain_union::make_union_table_name(char *buf)
{
uint childno= 0;
uint len= 6, lastop= 0;
memcpy(buf, STRING_WITH_LEN("<union"));
uint len, lastop= 0;
LEX_STRING type;
switch (operation)
{
case OP_MIX:
lex_string_set3(&type, STRING_WITH_LEN("<unit"));
break;
case OP_UNION:
lex_string_set3(&type, STRING_WITH_LEN("<union"));
break;
case OP_INTERSECT:
lex_string_set3(&type, STRING_WITH_LEN("<intersect"));
break;
case OP_EXCEPT:
lex_string_set3(&type, STRING_WITH_LEN("<except"));
break;
default:
DBUG_ASSERT(0);
}
memcpy(buf, type.str, (len= type.length));
for (; childno < union_members.elements() && len + lastop + 5 < NAME_LEN;
childno++)
@ -462,7 +485,7 @@ int Explain_union::print_explain(Explain_query *query,
if (!using_tmp)
return 0;
/* Print a line with "UNION RESULT" */
/* Print a line with "UNIT RESULT" */
List<Item> item_list;
Item *item_null= new (mem_root) Item_null(thd);
@ -814,6 +837,28 @@ int Explain_basic_join::print_explain(Explain_query *query,
}
void Explain_select::add_linkage(Json_writer *writer)
{
const char *operation= NULL;
switch (linkage)
{
case UNION_TYPE:
operation= "UNION";
break;
case INTERSECT_TYPE:
operation= "INTERSECT";
break;
case EXCEPT_TYPE:
operation= "EXCEPT";
break;
default:
// It is the first or the only SELECT => no operation
break;
}
if (operation)
writer->add_member("operation").add_str(operation);
}
void Explain_select::print_explain_json(Explain_query *query,
Json_writer *writer, bool is_analyze)
{
@ -825,6 +870,7 @@ void Explain_select::print_explain_json(Explain_query *query,
{
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);
@ -837,6 +883,7 @@ void Explain_select::print_explain_json(Explain_query *query,
{
writer->add_member("query_block").start_object();
writer->add_member("select_id").add_ll(select_id);
add_linkage(writer);
if (is_analyze && time_tracker.get_loops())
{