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MDEV-8789 Implement non-recursive common table expressions

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Initial implementation
This commit is contained in:
Galina Shalygina
2015-12-17 23:52:14 +03:00
committed by Igor Babaev
parent 12b86beac8
commit dfc4772f83
19 changed files with 2070 additions and 30 deletions
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23
sql/sql_select.cc
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@ -53,6 +53,7 @@
#include "log_slow.h"
#include "sql_derived.h"
#include "sql_statistics.h"
#include "sql_cte.h"
#include "debug_sync.h" // DEBUG_SYNC
#include <m_ctype.h>
@ -828,6 +829,10 @@ JOIN::prepare(Item ***rref_pointer_array,
DBUG_RETURN(-1); /* purecov: inspected */
thd->lex->allow_sum_func= save_allow_sum_func;
}
With_clause *with_clause=select_lex->get_with_clause();
if (with_clause && with_clause->prepare_unreferenced_elements(thd))
DBUG_RETURN(1);
int res= check_and_do_in_subquery_rewrites(this);
@ -24154,9 +24159,8 @@ int JOIN::save_explain_data_intern(Explain_query *output, bool need_tmp_table,
/* There should be no attempts to save query plans for merged selects */
DBUG_ASSERT(!join->select_lex->master_unit()->derived ||
join->select_lex->master_unit()->derived->is_materialized_derived());
explain= NULL;
join->select_lex->master_unit()->derived->is_materialized_derived() ||
join->select_lex->master_unit()->derived->is_with_table());
/* Don't log this into the slow query log */
@ -24665,11 +24669,14 @@ void TABLE_LIST::print(THD *thd, table_map eliminated_tables, String *str,
}
else if (derived)
{
// A derived table
str->append('(');
derived->print(str, query_type);
str->append(')');
cmp_name= ""; // Force printing of alias
if (!derived->derived->is_with_table())
{
// A derived table
str->append('(');
derived->print(str, query_type);
str->append(')');
cmp_name= ""; // Force printing of alias
}
}
else
{