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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_base.cc
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@ -49,6 +49,7 @@
#include "transaction.h"
#include "sql_prepare.h"
#include "sql_statistics.h"
#include "sql_cte.h"
#include <m_ctype.h>
#include <my_dir.h>
#include <hash.h>
@ -3925,6 +3926,26 @@ open_and_process_table(THD *thd, LEX *lex, TABLE_LIST *tables,
tables->table_name= tables->view_name.str;
tables->table_name_length= tables->view_name.length;
}
else if (tables->select_lex)
{
/*
Check whether 'tables' refers to a table defined in a with clause.
If so set the reference to the definition in tables->with.
*/
if (!tables->with)
tables->with= tables->select_lex->find_table_def_in_with_clauses(tables);
/*
If 'tables' is defined in a with clause set the pointer to the
specification from its definition in tables->derived.
*/
if (tables->with)
{
if (tables->set_as_with_table(thd, tables->with))
DBUG_RETURN(1);
else
goto end;
}
}
/*
If this TABLE_LIST object is a placeholder for an information_schema
table, create a temporary table to represent the information_schema
@ -8418,7 +8439,7 @@ insert_fields(THD *thd, Name_resolution_context *context, const char *db_name,
temporary table. Thus in this case we can be sure that 'item' is an
Item_field.
*/
if (any_privileges)
if (any_privileges && !tables->is_with_table() && !tables->is_derived())
{
DBUG_ASSERT((tables->field_translation == NULL && table) ||
tables->is_natural_join);