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Fix for BUG#15229.

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The cause of this bug was a design flaw due to which the list of natural
join columns was incorrectly computed and stored for nested joins that
are not natural joins, but are operands (possibly indirect) of nested joins.

The patch corrects the flaw in a such a way, that the result columns of a
table reference are materialized only if it is a leaf table (that is, only
if it is a view, stored table, or natural/using join).
This commit is contained in:
timour@mysql.com
2006-03-02 11:50:15 +02:00
parent ecb41e28f2
commit 103604ed06
5 changed files with 166 additions and 56 deletions
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63
sql/sql_base.cc
View File

@ -3608,8 +3608,18 @@ mark_common_columns(THD *thd, TABLE_LIST *table_ref_1, TABLE_LIST *table_ref_2,
Natural_join_column *nj_col_1, *nj_col_2;
const char *field_name_1;
Query_arena *arena, backup;
bool add_columns= TRUE;
bool result= TRUE;
bool first_outer_loop= TRUE;
/*
Leaf table references to which new natural join columns are added
if the leaves are != NULL.
*/
TABLE_LIST *leaf_1= (table_ref_1->nested_join &&
!table_ref_1->is_natural_join) ?
NULL : table_ref_1;
TABLE_LIST *leaf_2= (table_ref_2->nested_join &&
!table_ref_2->is_natural_join) ?
NULL : table_ref_2;
DBUG_ENTER("mark_common_columns");
DBUG_PRINT("info", ("operand_1: %s operand_2: %s",
@ -3618,35 +3628,13 @@ mark_common_columns(THD *thd, TABLE_LIST *table_ref_1, TABLE_LIST *table_ref_2,
*found_using_fields= 0;
arena= thd->activate_stmt_arena_if_needed(&backup);
/*
TABLE_LIST::join_columns could be allocated by the previous call to
store_natural_using_join_columns() for the lower level of nested tables.
*/
if (!table_ref_1->join_columns)
{
if (!(table_ref_1->join_columns= new List<Natural_join_column>))
goto err;
table_ref_1->is_join_columns_complete= FALSE;
}
if (!table_ref_2->join_columns)
{
if (!(table_ref_2->join_columns= new List<Natural_join_column>))
goto err;
table_ref_2->is_join_columns_complete= FALSE;
}
for (it_1.set(table_ref_1); !it_1.end_of_fields(); it_1.next())
{
bool is_created_1;
bool found= FALSE;
if (!(nj_col_1= it_1.get_or_create_column_ref(&is_created_1)))
if (!(nj_col_1= it_1.get_or_create_column_ref(leaf_1)))
goto err;
field_name_1= nj_col_1->name();
/* If nj_col_1 was just created add it to the list of join columns. */
if (is_created_1)
table_ref_1->join_columns->push_back(nj_col_1);
/*
Find a field with the same name in table_ref_2.
@ -3657,17 +3645,12 @@ mark_common_columns(THD *thd, TABLE_LIST *table_ref_1, TABLE_LIST *table_ref_2,
nj_col_2= NULL;
for (it_2.set(table_ref_2); !it_2.end_of_fields(); it_2.next())
{
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(&is_created_2)))
if (!(cur_nj_col_2= it_2.get_or_create_column_ref(leaf_2)))
goto err;
cur_field_name_2= cur_nj_col_2->name();
/* If nj_col_1 was just created add it to the list of join columns. */
if (add_columns && is_created_2)
table_ref_2->join_columns->push_back(cur_nj_col_2);
/*
Compare the two columns and check for duplicate common fields.
A common field is duplicate either if it was already found in
@ -3686,9 +3669,15 @@ mark_common_columns(THD *thd, TABLE_LIST *table_ref_1, TABLE_LIST *table_ref_2,
found= TRUE;
}
}
/* Force it_2.set() to use table_ref_2->join_columns. */
table_ref_2->is_join_columns_complete= TRUE;
add_columns= FALSE;
if (first_outer_loop && leaf_2)
{
/*
Make sure that the next inner loop "knows" that all columns
are materialized already.
*/
leaf_2->is_join_columns_complete= TRUE;
first_outer_loop= FALSE;
}
if (!found)
continue; // No matching field
@ -3772,7 +3761,8 @@ mark_common_columns(THD *thd, TABLE_LIST *table_ref_1, TABLE_LIST *table_ref_2,
++(*found_using_fields);
}
}
table_ref_1->is_join_columns_complete= TRUE;
if (leaf_1)
leaf_1->is_join_columns_complete= TRUE;
/*
Everything is OK.
@ -4625,16 +4615,15 @@ insert_fields(THD *thd, Name_resolution_context *context, const char *db_name,
if (tables->is_natural_join)
{
bool is_created;
TABLE *field_table;
/*
In this case we are sure that the column ref will not be created
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(&is_created)))
if (!(nj_col= field_iterator.get_natural_column_ref()))
DBUG_RETURN(TRUE);
DBUG_ASSERT(nj_col->table_field && !is_created);
DBUG_ASSERT(nj_col->table_field);
field_table= nj_col->table_ref->table;
if (field_table)
{