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WL#2486 - Natural/using join according to SQL:2003.

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Post-review fixes according to Monty's review.


sql/item.h:
  Unite all code that stores and restores the state of a name resolution context
  into a class to represent the state, and methods to save/restore that
  state.
sql/mysql_priv.h:
  Reorder parameters so that length is after the name of a field,
  and database is before table name.
sql/sql_acl.cc:
  Reorder parameters so that length is after the name of a field,
  and database is before table name.
sql/sql_base.cc:
  * Reorder parameters so that length is after the name of a field,
    and database is before table name.
  * Added new method - Field_iterator_table_ref::get_natural_column_ref
    to avoid unnecessary code when it is knwon that no new columns will
    be created when accessing natural join columns.
sql/sql_insert.cc:
  Unite all code that stores and restores the state of a name resolution context
  into a class to represent the state, and methods to save/restore that
  state.
sql/sql_lex.cc:
  Removed obsolete comment.
sql/sql_lex.h:
  Return error from push_contex() if there is no memory.
sql/sql_list.h:
  Extended base_list_iterator, List_iterator, and List_iterator_fast with an
  empty constructor, and init() methods, so that one doesn't have to construct
  a new iterator object every time one needs to iterate over a new list.
sql/sql_parse.cc:
  Moved common functionality from the parser into one function, and renamed
  the function to better reflect what it does.
sql/sql_yacc.yy:
  Moved common functionality from the parser into one function, and renamed
  the function to better reflect what it does.
sql/table.cc:
  * Extended base_list_iterator, List_iterator, and List_iterator_fast with an
    empty constructor, and init() methods, so that one doesn't have to construct
    a new iterator object every time one needs to iterate over a new list.
  * Added new method Field_iterator_table_ref::get_natural_column_ref to be
    used in cases when it is known for sure that no new columns should be
    created.
sql/table.h:
  - column_ref_it no longer allocated for each new list of columns
  - new method get_natural_join_column for faster/simpler access
    to natural join columns.
This commit is contained in:
unknown 2005-11-28 21:57:50 +02:00
parent 97bfd41fe1
commit 4fd41f7c0b
12 changed files with 189 additions and 183 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
sql/item.h
View File

@ -326,6 +326,48 @@ struct Name_resolution_context: Sql_alloc
};
/*
Store and restore the current state of a name resolution context.
*/
class Name_resolution_context_state
{
private:
TABLE_LIST *save_table_list;
TABLE_LIST *save_first_name_resolution_table;
TABLE_LIST *save_next_name_resolution_table;
bool save_resolve_in_select_list;
public:
TABLE_LIST *save_next_local;
public:
/* Save the state of a name resolution context. */
void save_state(Name_resolution_context *context, TABLE_LIST *table_list)
{
save_table_list= context->table_list;
save_first_name_resolution_table= context->first_name_resolution_table;
save_next_name_resolution_table= (context->first_name_resolution_table) ?
context->first_name_resolution_table->
next_name_resolution_table :
NULL;
save_resolve_in_select_list= context->resolve_in_select_list;
save_next_local= table_list->next_local;
}
/* Restore a name resolution context from saved state. */
void restore_state(Name_resolution_context *context, TABLE_LIST *table_list)
{
table_list->next_local= save_next_local;
context->table_list= save_table_list;
context->first_name_resolution_table= save_first_name_resolution_table;
if (context->first_name_resolution_table)
context->first_name_resolution_table->
next_name_resolution_table= save_next_name_resolution_table;
context->resolve_in_select_list= save_resolve_in_select_list;
}
};
/*************************************************************************/
typedef bool (Item::*Item_processor)(byte *arg);

14
sql/mysql_priv.h
View File

@ -791,12 +791,11 @@ find_field_in_tables(THD *thd, Item_ident *item,
bool check_privileges, bool register_tree_change);
Field *
find_field_in_table_ref(THD *thd, TABLE_LIST *table_list,
const char *name, const char *item_name,
const char *table_name, const char *db_name,
uint length, Item **ref,
const char *name, uint length,
const char *item_name, const char *db_name,
const char *table_name, Item **ref,
bool check_grants_table, bool check_grants_view,
bool allow_rowid,
uint *cached_field_index_ptr,
bool allow_rowid, uint *cached_field_index_ptr,
bool register_tree_change, TABLE_LIST **actual_table);
Field *
find_field_in_table(THD *thd, TABLE *table, const char *name,
@ -918,8 +917,9 @@ create_field * new_create_field(THD *thd, char *field_name, enum_field_types typ
uint uint_geom_type);
void store_position_for_column(const char *name);
bool add_to_list(THD *thd, SQL_LIST &list,Item *group,bool asc);
Name_resolution_context *make_join_on_context(THD *thd, TABLE_LIST *left_op,
TABLE_LIST *right_op);
bool push_new_name_resolution_context(THD *thd,
TABLE_LIST *left_op,
TABLE_LIST *right_op);
void add_join_on(TABLE_LIST *b,Item *expr);
void add_join_natural(TABLE_LIST *a,TABLE_LIST *b,List<String> *using_fields);
bool add_proc_to_list(THD *thd, Item *item);

3
sql/sql_acl.cc
View File

@ -2761,8 +2761,9 @@ bool mysql_table_grant(THD *thd, TABLE_LIST *table_list,
uint unused_field_idx= NO_CACHED_FIELD_INDEX;
TABLE_LIST *dummy;
Field *f=find_field_in_table_ref(thd, table_list, column->column.ptr(),
column->column.length(),
column->column.ptr(), NULL, NULL,
column->column.length(), 0, 1, 1, 0,
0, 1, 1, 0,
&unused_field_idx, FALSE, &dummy);
if (f == (Field*)0)
{

79
sql/sql_base.cc
View File

@ -2732,8 +2732,8 @@ static bool check_grant_column_in_sctx(THD *thd, GRANT_INFO *grant,
thd thread handler
table_list view to search for 'name'
name name of field
item_name name of item if it will be created (VIEW)
length length of name
item_name name of item if it will be created (VIEW)
ref expression substituted in VIEW should be passed
using this reference (return view_ref_found)
check_grants do check columns grants for view?
@ -2748,9 +2748,9 @@ static bool check_grant_column_in_sctx(THD *thd, GRANT_INFO *grant,
static Field *
find_field_in_view(THD *thd, TABLE_LIST *table_list,
const char *name, const char *item_name,
uint length, Item **ref, bool check_grants,
bool register_tree_change)
const char *name, uint length,
const char *item_name, Item **ref,
bool check_grants, bool register_tree_change)
{
DBUG_ENTER("find_field_in_view");
DBUG_PRINT("enter",
@ -2766,13 +2766,6 @@ find_field_in_view(THD *thd, TABLE_LIST *table_list,
{
if (!my_strcasecmp(system_charset_info, field_it.name(), name))
{
if (table_list->schema_table_reformed)
/*
Translation table items are always Item_fields and fixed already
('mysql_schema_table' function). So we can return ->field. It is
used only for 'show & where' commands.
*/
DBUG_RETURN(((Item_field*) (field_it.item()))->field);
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (check_grant_column_in_sctx(thd, &table_list->grant,
table_list->view_db.str,
@ -2784,6 +2777,10 @@ find_field_in_view(THD *thd, TABLE_LIST *table_list,
// in PS use own arena or data will be freed after prepare
if (register_tree_change)
arena= thd->activate_stmt_arena_if_needed(&backup);
/*
create_item() may, or may not create a new Item, depending on
the column reference. See create_view_field() for details.
*/
Item *item= field_it.create_item(thd);
if (register_tree_change && arena)
thd->restore_active_arena(arena, &backup);
@ -2880,15 +2877,13 @@ find_field_in_natural_join(THD *thd, TABLE_LIST *table_ref, const char *name,
if (nj_col->view_field)
{
Item *item;
/*
The found field is a view field, we do as in find_field_in_view()
and return a pointer to pointer to the Item of that field.
*/
if (register_tree_change)
arena= thd->activate_stmt_arena_if_needed(&backup);
/*
create_item() may, or may not create a new Item, depending on the
column reference. See create_view_field() for details.
*/
item= nj_col->create_item(thd);
if (register_tree_change && arena)
thd->restore_active_arena(arena, &backup);
@ -3006,10 +3001,10 @@ find_field_in_table(THD *thd, TABLE *table, const char *name, uint length,
thd [in] thread handler
table_list [in] table reference to search
name [in] name of field
item_name [in] name of item if it will be created (VIEW)
table_name [in] optional table name that qualifies the field
db_name [in] optional database name that qualifies the
length [in] field length of name
item_name [in] name of item if it will be created (VIEW)
db_name [in] optional database name that qualifies the
table_name [in] optional table name that qualifies the field
ref [in/out] if 'name' is resolved to a view field, ref
is set to point to the found view field
check_grants_table [in] do check columns grants for table?
@ -3043,9 +3038,9 @@ find_field_in_table(THD *thd, TABLE *table, const char *name, uint length,
Field *
find_field_in_table_ref(THD *thd, TABLE_LIST *table_list,
const char *name, const char *item_name,
const char *table_name, const char *db_name,
uint length, Item **ref,
const char *name, uint length,
const char *item_name, const char *db_name,
const char *table_name, Item **ref,
bool check_grants_table, bool check_grants_view,
bool allow_rowid, uint *cached_field_index_ptr,
bool register_tree_change, TABLE_LIST **actual_table)
@ -3092,7 +3087,7 @@ find_field_in_table_ref(THD *thd, TABLE_LIST *table_list,
if (table_list->field_translation)
{
/* 'table_list' is a view or an information schema table. */
if ((fld= find_field_in_view(thd, table_list, name, item_name, length,
if ((fld= find_field_in_view(thd, table_list, name, length, item_name,
ref, check_grants_view,
register_tree_change)))
*actual_table= table_list;
@ -3132,8 +3127,8 @@ find_field_in_table_ref(THD *thd, TABLE_LIST *table_list,
TABLE_LIST *table;
while ((table= it++))
{
if ((fld= find_field_in_table_ref(thd, table, name, item_name,
table_name, db_name, length, ref,
if ((fld= find_field_in_table_ref(thd, table, name, length, item_name,
db_name, table_name, ref,
check_grants_table,
check_grants_view,
allow_rowid, cached_field_index_ptr,
@ -3241,8 +3236,8 @@ find_field_in_tables(THD *thd, Item_ident *item,
1, &(item->cached_field_index),
table_ref->security_ctx);
else
found= find_field_in_table_ref(thd, table_ref, name, item->name,
NULL, NULL, length, ref,
found= find_field_in_table_ref(thd, table_ref, name, length, item->name,
NULL, NULL, ref,
(table_ref->table &&
test(table_ref->table->grant.
want_privilege) &&
@ -3289,9 +3284,8 @@ find_field_in_tables(THD *thd, Item_ident *item,
for (; cur_table != last_table ;
cur_table= cur_table->next_name_resolution_table)
{
Field *cur_field= find_field_in_table_ref(thd, cur_table, name, item->name,
table_name, db,
length, ref,
Field *cur_field= find_field_in_table_ref(thd, cur_table, name, length,
item->name, db, table_name, ref,
(cur_table->table &&
test(cur_table->table->grant.
want_privilege) &&
@ -3707,7 +3701,7 @@ mark_common_columns(THD *thd, TABLE_LIST *table_ref_1, TABLE_LIST *table_ref_2,
{
bool is_created_1;
bool found= FALSE;
if (!(nj_col_1= it_1.get_or_create_column_ref(thd, &is_created_1)))
if (!(nj_col_1= it_1.get_or_create_column_ref(&is_created_1)))
goto err;
field_name_1= nj_col_1->name();
@ -3728,7 +3722,7 @@ mark_common_columns(THD *thd, TABLE_LIST *table_ref_1, TABLE_LIST *table_ref_2,
bool is_created_2;
Natural_join_column *cur_nj_col_2;
const char *cur_field_name_2;
if (!(cur_nj_col_2= it_2.get_or_create_column_ref(thd, &is_created_2)))
if (!(cur_nj_col_2= it_2.get_or_create_column_ref(&is_created_2)))
goto err;
cur_field_name_2= cur_nj_col_2->name();
@ -3920,13 +3914,7 @@ store_natural_using_join_columns(THD *thd, TABLE_LIST *natural_using_join,
/* Append the columns of the first join operand. */
for (it_1.set(table_ref_1); !it_1.end_of_fields(); it_1.next())
{
if (!(nj_col_1= it_1.get_or_create_column_ref(thd, &is_created)))
goto err;
/*
The following assert checks that mark_common_columns() was run and
we created the list table_ref_1->join_columns.
*/
DBUG_ASSERT(!is_created);
nj_col_1= it_1.get_natural_column_ref();
if (nj_col_1->is_common)
{
natural_using_join->join_columns->push_back(nj_col_1);
@ -3972,13 +3960,7 @@ store_natural_using_join_columns(THD *thd, TABLE_LIST *natural_using_join,
/* Append the non-equi-join columns of the second join operand. */
for (it_2.set(table_ref_2); !it_2.end_of_fields(); it_2.next())
{
if (!(nj_col_2= it_2.get_or_create_column_ref(thd, &is_created)))
goto err;
/*
The following assert checks that mark_common_columns() was run and
we created the list table_ref_2->join_columns.
*/
DBUG_ASSERT(!is_created);
nj_col_2= it_2.get_natural_column_ref();
if (!nj_col_2->is_common)
non_join_columns->push_back(nj_col_2);
else
@ -4712,8 +4694,7 @@ insert_fields(THD *thd, Name_resolution_context *context, const char *db_name,
because it was already created and stored with the natural join.
*/
Natural_join_column *nj_col;
if (!(nj_col= field_iterator.get_or_create_column_ref(thd,
&is_created)))
if (!(nj_col= field_iterator.get_or_create_column_ref(&is_created)))
DBUG_RETURN(TRUE);
DBUG_ASSERT(nj_col->table_field && !is_created);
field_table= nj_col->table_ref->table;

97
sql/sql_insert.cc
View File

@ -108,11 +108,7 @@ static int check_insert_fields(THD *thd, TABLE_LIST *table_list,
{ // Part field list
SELECT_LEX *select_lex= &thd->lex->select_lex;
Name_resolution_context *context= &select_lex->context;
TABLE_LIST *save_next_local;
TABLE_LIST *save_table_list;
TABLE_LIST *save_first_name_resolution_table;
TABLE_LIST *save_next_name_resolution_table;
bool save_resolve_in_select_list;
Name_resolution_context_state ctx_state;
int res;
if (fields.elements != values.elements)
@ -125,14 +121,7 @@ static int check_insert_fields(THD *thd, TABLE_LIST *table_list,
select_lex->no_wrap_view_item= TRUE;
/* Save the state of the current name resolution context. */
save_table_list= context->table_list;
save_first_name_resolution_table= context->first_name_resolution_table;
save_next_name_resolution_table= (context->first_name_resolution_table) ?
context->first_name_resolution_table->
next_name_resolution_table :
NULL;
save_resolve_in_select_list= context->resolve_in_select_list;
save_next_local= table_list->next_local;
ctx_state.save_state(context, table_list);
/*
Perform name resolution only in the first table - 'table_list',
@ -143,13 +132,7 @@ static int check_insert_fields(THD *thd, TABLE_LIST *table_list,
res= setup_fields(thd, 0, fields, 1, 0, 0);
/* Restore the current context. */
table_list->next_local= save_next_local;
context->table_list= save_table_list;
context->first_name_resolution_table= save_first_name_resolution_table;
if (context->first_name_resolution_table)
context->first_name_resolution_table->
next_name_resolution_table= save_next_name_resolution_table;
context->resolve_in_select_list= save_resolve_in_select_list;
ctx_state.restore_state(context, table_list);
thd->lex->select_lex.no_wrap_view_item= FALSE;
if (res)
@ -280,13 +263,10 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
ulonglong id;
COPY_INFO info;
TABLE *table= 0;
TABLE_LIST *save_table_list;
TABLE_LIST *save_next_local;
TABLE_LIST *save_first_name_resolution_table;
TABLE_LIST *save_next_name_resolution_table;
List_iterator_fast<List_item> its(values_list);
List_item *values;
Name_resolution_context *context;
Name_resolution_context_state ctx_state;
#ifndef EMBEDDED_LIBRARY
char *query= thd->query;
#endif
@ -367,13 +347,7 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
context= &thd->lex->select_lex.context;
/* Save the state of the current name resolution context. */
save_table_list= context->table_list;
save_first_name_resolution_table= context->first_name_resolution_table;
save_next_name_resolution_table= (context->first_name_resolution_table) ?
context->first_name_resolution_table->
next_name_resolution_table :
NULL;
save_next_local= table_list->next_local;
ctx_state.save_state(context, table_list);
/*
Perform name resolution only in the first table - 'table_list',
@ -397,16 +371,11 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
its.rewind ();
/* Restore the current context. */
table_list->next_local= save_next_local;
context->first_name_resolution_table= save_first_name_resolution_table;
if (context->first_name_resolution_table)
context->first_name_resolution_table->
next_name_resolution_table= save_next_name_resolution_table;
ctx_state.restore_state(context, table_list);
/*
Fill in the given fields and dump it to the table file
*/
info.records= info.deleted= info.copied= info.updated= 0;
info.ignore= ignore;
info.handle_duplicates=duplic;
@ -814,11 +783,7 @@ bool mysql_prepare_insert(THD *thd, TABLE_LIST *table_list,
{
SELECT_LEX *select_lex= &thd->lex->select_lex;
Name_resolution_context *context= &select_lex->context;
TABLE_LIST *save_table_list;
TABLE_LIST *save_next_local;
TABLE_LIST *save_first_name_resolution_table;
TABLE_LIST *save_next_name_resolution_table;
bool save_resolve_in_select_list;
Name_resolution_context_state ctx_state;
bool insert_into_view= (table_list->view != 0);
bool res= 0;
DBUG_ENTER("mysql_prepare_insert");
@ -858,15 +823,7 @@ bool mysql_prepare_insert(THD *thd, TABLE_LIST *table_list,
DBUG_RETURN(TRUE);
/* Save the state of the current name resolution context. */
save_table_list= context->table_list;
/* Here first_name_resolution_table points to the first select table. */
save_first_name_resolution_table= context->first_name_resolution_table;
save_next_name_resolution_table= (context->first_name_resolution_table) ?
context->first_name_resolution_table->
next_name_resolution_table :
NULL;
save_resolve_in_select_list= context->resolve_in_select_list;
save_next_local= table_list->next_local;
ctx_state.save_state(context, table_list);
/*
Perform name resolution only in the first table - 'table_list',
@ -891,23 +848,17 @@ bool mysql_prepare_insert(THD *thd, TABLE_LIST *table_list,
*/
if (select_lex->group_list.elements == 0)
{
context->table_list->next_local= save_next_local;
context->table_list->next_local= ctx_state.save_next_local;
/* first_name_resolution_table was set by resolve_in_table_list_only() */
context->first_name_resolution_table->
next_name_resolution_table= save_next_local;
next_name_resolution_table= ctx_state.save_next_local;
}
if (!res)
res= setup_fields(thd, 0, update_values, 1, 0, 0);
}
/* Restore the current context. */
table_list->next_local= save_next_local;
context->table_list= save_table_list;
context->first_name_resolution_table= save_first_name_resolution_table;
if (context->first_name_resolution_table)
context->first_name_resolution_table->
next_name_resolution_table= save_next_name_resolution_table;
context->resolve_in_select_list= save_resolve_in_select_list;
ctx_state.restore_state(context, table_list);
if (res)
DBUG_RETURN(res);
@ -2176,17 +2127,10 @@ select_insert::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
{
/* Save the state of the current name resolution context. */
Name_resolution_context *context= &lex->select_lex.context;
TABLE_LIST *save_table_list;
TABLE_LIST *save_next_local;
TABLE_LIST *save_first_name_resolution_table;
TABLE_LIST *save_next_name_resolution_table;
save_table_list= context->table_list;
save_first_name_resolution_table= context->first_name_resolution_table;
save_next_name_resolution_table= (context->first_name_resolution_table) ?
context->first_name_resolution_table->
next_name_resolution_table :
NULL;
save_next_local= table_list->next_local;
Name_resolution_context_state ctx_state;
/* Save the state of the current name resolution context. */
ctx_state.save_state(context, table_list);
/* Perform name resolution only in the first table - 'table_list'. */
table_list->next_local= 0;
@ -2202,20 +2146,15 @@ select_insert::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
*/
if (lex->select_lex.group_list.elements == 0)
{
context->table_list->next_local= save_next_local;
context->table_list->next_local= ctx_state.save_next_local;
/* first_name_resolution_table was set by resolve_in_table_list_only() */
context->first_name_resolution_table->
next_name_resolution_table= save_next_local;
next_name_resolution_table= ctx_state.save_next_local;
}
res= res || setup_fields(thd, 0, *info.update_values, 1, 0, 0);
/* Restore the current context. */
table_list->next_local= save_next_local;
context->first_name_resolution_table= save_first_name_resolution_table;
if (context->first_name_resolution_table)
context->first_name_resolution_table->
next_name_resolution_table= save_next_name_resolution_table;
ctx_state.restore_state(context, table_list);
}
lex->current_select= lex_current_select_save;

5
sql/sql_lex.cc
View File

@ -1127,6 +1127,11 @@ void st_select_lex::init_query()
/*
Add the name resolution context of the current (sub)query to the
stack of contexts for the whole query.
TODO:
push_context may return an error if there is no memory for a new
element in the stack, however this method has no return value,
thus push_context should be moved to a place where query
initialization is checked for failure.
*/
parent_lex->push_context(&context);
cond_count= with_wild= 0;

4
sql/sql_lex.h
View File

@ -1006,9 +1006,9 @@ typedef struct st_lex
}
void cleanup_after_one_table_open();
void push_context(Name_resolution_context *context)
bool push_context(Name_resolution_context *context)
{
context_stack.push_front(context);
return context_stack.push_front(context);
}
void pop_context()

19
sql/sql_list.h
View File

@ -266,10 +266,21 @@ protected:
ls.elements= elm;
}
public:
base_list_iterator(base_list &list_par)
:list(&list_par), el(&list_par.first), prev(0), current(0)
base_list_iterator()
:list(0), el(0), prev(0), current(0)
{}
base_list_iterator(base_list &list_par)
{ init(list_par); }
inline void init(base_list &list_par)
{
list= &list_par;
el= &list_par.first;
prev= 0;
current= 0;
}
inline void *next(void)
{
prev=el;
@ -364,6 +375,8 @@ template <class T> class List_iterator :public base_list_iterator
{
public:
List_iterator(List<T> &a) : base_list_iterator(a) {}
List_iterator() : base_list_iterator() {}
inline void init(List<T> &a) { base_list_iterator::init(a); }
inline T* operator++(int) { return (T*) base_list_iterator::next(); }
inline T *replace(T *a) { return (T*) base_list_iterator::replace(a); }
inline T *replace(List<T> &a) { return (T*) base_list_iterator::replace(a); }
@ -385,6 +398,8 @@ protected:
public:
inline List_iterator_fast(List<T> &a) : base_list_iterator(a) {}
inline List_iterator_fast() : base_list_iterator() {}
inline void init(List<T> &a) { base_list_iterator::init(a); }
inline T* operator++(int) { return (T*) base_list_iterator::next_fast(); }
inline void rewind(void) { base_list_iterator::rewind(); }
void sublist(List<T> &list_arg, uint el_arg)

23
sql/sql_parse.cc
View File

@ -6584,36 +6584,39 @@ void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
/*
Create a new name resolution context for a JOIN ... ON clause.
Push a new name resolution context for a JOIN ... ON clause to the
context stack of a query block.
SYNOPSIS
make_join_on_context()
push_new_name_resolution_context()
thd pointer to current thread
left_op left operand of the JOIN
right_op rigth operand of the JOIN
DESCRIPTION
Create a new name resolution context for a JOIN ... ON clause,
and set the first and last leaves of the list of table references
to be used for name resolution.
set the first and last leaves of the list of table references
to be used for name resolution, and push the newly created
context to the stack of contexts of the query.
RETURN
A new context if all is OK
NULL - if a memory allocation error occured
FALSE if all is OK
TRUE if a memory allocation error occured
*/
Name_resolution_context *
make_join_on_context(THD *thd, TABLE_LIST *left_op, TABLE_LIST *right_op)
bool
push_new_name_resolution_context(THD *thd,
TABLE_LIST *left_op, TABLE_LIST *right_op)
{
Name_resolution_context *on_context;
if (!(on_context= new (thd->mem_root) Name_resolution_context))
return NULL;
return TRUE;
on_context->init();
on_context->first_name_resolution_table=
left_op->first_leaf_for_name_resolution();
on_context->last_name_resolution_table=
right_op->last_leaf_for_name_resolution();
return on_context;
return thd->lex->push_context(on_context);
}

21
sql/sql_yacc.yy
View File

@ -5175,10 +5175,8 @@ join_table:
{
YYERROR_UNLESS($1 && ($$=$3));
/* Change the current name resolution context to a local context. */
Name_resolution_context *on_context;
if (!(on_context= make_join_on_context(YYTHD,$1,$3)))
if (push_new_name_resolution_context(YYTHD, $1, $3))
YYABORT;
Lex->push_context(on_context);
}
expr
{
@ -5190,10 +5188,8 @@ join_table:
{
YYERROR_UNLESS($1 && ($$=$3));
/* Change the current name resolution context to a local context. */
Name_resolution_context *on_context;
if (!(on_context= make_join_on_context(YYTHD,$1,$3)))
if (push_new_name_resolution_context(YYTHD, $1, $3))
YYABORT;
Lex->push_context(on_context);
}
expr
{
@ -5220,10 +5216,8 @@ join_table:
ON
{
/* Change the current name resolution context to a local context. */
Name_resolution_context *on_context;
if (!(on_context= make_join_on_context(YYTHD,$1,$5)))
if (push_new_name_resolution_context(YYTHD, $1, $5))
YYABORT;
Lex->push_context(on_context);
}
expr
{
@ -5253,10 +5247,8 @@ join_table:
ON
{
/* Change the current name resolution context to a local context. */
Name_resolution_context *on_context;
if (!(on_context= make_join_on_context(YYTHD,$1,$5)))
if (push_new_name_resolution_context(YYTHD, $1, $5))
YYABORT;
Lex->push_context(on_context);
}
expr
{
@ -5317,10 +5309,9 @@ table_factor:
ON
{
/* Change the current name resolution context to a local context. */
Name_resolution_context *on_context;
if (!(on_context= make_join_on_context(YYTHD,$3,$7)))
if (push_new_name_resolution_context(YYTHD, $3, $7))
YYABORT;
Lex->push_context(on_context);
}
expr '}'
{

56
sql/table.cc
View File

@ -2702,8 +2702,9 @@ Item *create_view_field(THD *thd, TABLE_LIST *view, Item **field_ref,
if (view->schema_table_reformed)
{
/*
In case of SHOW command (schema_table_reformed set) all items are
fixed
Translation table items are always Item_fields and already fixed
('mysql_schema_table' function). So we can return directly the
field. This case happens only for 'show & where' commands.
*/
DBUG_ASSERT(field && field->fixed);
DBUG_RETURN(field);
@ -2735,21 +2736,14 @@ Item *create_view_field(THD *thd, TABLE_LIST *view, Item **field_ref,
void Field_iterator_natural_join::set(TABLE_LIST *table_ref)
{
DBUG_ASSERT(table_ref->join_columns);
delete column_ref_it;
/*
TODO: try not to allocate new iterator every time. If we have to,
then check for out of memory condition.
*/
column_ref_it= new List_iterator_fast<Natural_join_column>
(*(table_ref->join_columns));
cur_column_ref= (*column_ref_it)++;
column_ref_it.init(*(table_ref->join_columns));
cur_column_ref= column_ref_it++;
}
void Field_iterator_natural_join::next()
{
cur_column_ref= (*column_ref_it)++;
cur_column_ref= column_ref_it++;
DBUG_ASSERT(!cur_column_ref || ! cur_column_ref->table_field ||
cur_column_ref->table_ref->table ==
cur_column_ref->table_field->table);
@ -2876,7 +2870,6 @@ GRANT_INFO *Field_iterator_table_ref::grant()
SYNOPSIS
Field_iterator_table_ref::get_or_create_column_ref()
thd [in] pointer to current thread
is_created [out] set to TRUE if the column was created,
FALSE if we return an already created colum
@ -2889,7 +2882,7 @@ GRANT_INFO *Field_iterator_table_ref::grant()
*/
Natural_join_column *
Field_iterator_table_ref::get_or_create_column_ref(THD *thd, bool *is_created)
Field_iterator_table_ref::get_or_create_column_ref(bool *is_created)
{
Natural_join_column *nj_col;
@ -2923,6 +2916,41 @@ Field_iterator_table_ref::get_or_create_column_ref(THD *thd, bool *is_created)
}
/*
Return an existing reference to a column of a natural/using join.
SYNOPSIS
Field_iterator_table_ref::get_natural_column_ref()
DESCRIPTION
The method should be called in contexts where it is expected that
all natural join columns are already created, and that the column
being retrieved is a Natural_join_column.
RETURN
# Pointer to a column of a natural join (or its operand)
NULL No memory to allocate the column
*/
Natural_join_column *
Field_iterator_table_ref::get_natural_column_ref()
{
Natural_join_column *nj_col;
DBUG_ASSERT(field_it == &natural_join_it);
/*
The field belongs to a NATURAL join, therefore the column reference was
already created via one of the two constructor calls above. In this case
we just return the already created column reference.
*/
nj_col= natural_join_it.column_ref();
DBUG_ASSERT(nj_col &&
(!nj_col->table_field ||
nj_col->table_ref->table == nj_col->table_field->table));
return nj_col;
}
/*****************************************************************************
** Instansiate templates
*****************************************************************************/

9
sql/table.h
View File

@ -734,11 +734,11 @@ public:
class Field_iterator_natural_join: public Field_iterator
{
List_iterator_fast<Natural_join_column> *column_ref_it;
List_iterator_fast<Natural_join_column> column_ref_it;
Natural_join_column *cur_column_ref;
public:
Field_iterator_natural_join() :column_ref_it(NULL), cur_column_ref(NULL) {}
~Field_iterator_natural_join() { delete column_ref_it; }
Field_iterator_natural_join() :cur_column_ref(NULL) {}
~Field_iterator_natural_join() {}
void set(TABLE_LIST *table);
void next();
bool end_of_fields() { return !cur_column_ref; }
@ -785,7 +785,8 @@ public:
GRANT_INFO *grant();
Item *create_item(THD *thd) { return field_it->create_item(thd); }
Field *field() { return field_it->field(); }
Natural_join_column *get_or_create_column_ref(THD *thd, bool *is_created);
Natural_join_column *get_or_create_column_ref(bool *is_created);
Natural_join_column *get_natural_column_ref();
};