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Initial patch for the implementation of window functions (MDEV-6115):

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- All parsing problems look like resolved
- Stub performing name resolution of window functions
in simplest queries has been added.
This commit is contained in:
Igor Babaev
2016-02-12 20:33:56 -08:00
parent 2cfc450bf7
commit 9d9c60fb12
15 changed files with 768 additions and 6 deletions
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79
sql/sql_window.cc Normal file
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@ -0,0 +1,79 @@
#include "sql_select.h"
#include "sql_window.h"
bool
Window_spec::check_window_names(List_iterator_fast<Window_spec> &it)
{
char *name= this->name();
char *ref_name= window_reference();
bool win_ref_is_resolved= false;
it.rewind();
Window_spec *win_spec;
while((win_spec= it++) && win_spec != this)
{
char *win_spec_name= win_spec->name();
if (win_spec_name)
{
if (name && my_strcasecmp(system_charset_info, name, win_spec_name) == 0)
{
my_error(ER_DUP_WINDOW_NAME, MYF(0), name);
return true;
}
if (ref_name &&
my_strcasecmp(system_charset_info, ref_name, win_spec_name) == 0)
{
if (win_spec->partition_list.elements)
{
my_error(ER_PARTITION_LIST_IN_REFERENCING_WINDOW_SPEC, MYF(0),
ref_name);
return true;
}
if (win_spec->order_list.elements && order_list.elements)
{
my_error(ER_ORDER_LIST_IN_REFERENCING_WINDOW_SPEC, MYF(0), ref_name);
return true;
}
if (win_spec->window_frame)
{
my_error(ER_WINDOW_FRAME_IN_REFERENCED_WINDOW_SPEC, MYF(0), ref_name);
return true;
}
referenced_win_spec=win_spec;
win_ref_is_resolved= true;
}
}
}
if (ref_name && !win_ref_is_resolved)
{
my_error(ER_WRONG_WINDOW_SPEC_NAME, MYF(0), ref_name);
return true;
}
return false;
}
int
setup_windows(THD *thd, Ref_ptr_array ref_pointer_array, TABLE_LIST *tables,
List<Item> &fields, List<Item> &all_fields,
List<Window_spec> win_specs)
{
Window_spec *win_spec;
DBUG_ENTER("setup_windows");
List_iterator<Window_spec> it(win_specs);
List_iterator_fast<Window_spec> itp(win_specs);
while ((win_spec= it++))
{
bool hidden_group_fields;
if (win_spec->check_window_names(itp) ||
setup_group(thd, ref_pointer_array, tables, fields, all_fields,
win_spec->partition_list.first, &hidden_group_fields) ||
setup_order(thd, ref_pointer_array, tables, fields, all_fields,
win_spec->order_list.first))
{
DBUG_RETURN(1);
}
}
DBUG_RETURN(0);
}