Rick Hillegas created DERBY-6040:
------------------------------------
Summary: Incorrect row order returned for an ORDER BY on a join of
two metadata table functions
Key: DERBY-6040
URL: https://issues.apache.org/jira/browse/DERBY-6040
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.10.0.0
Reporter: Rick Hillegas
Using the metadata table functions introduced by DERBY-6022, I get the wrong
row order on this query:
select t.table_name c2, c.column_name c3
from table( getTables( null, '%', '%' ) ) t,
table( getColumns( null, '%', '%', '%') ) c
where c.table_name = t.table_name
and t.table_type = 'TABLE'
and c.table_schem = t.table_schem
order by c2, c3;
However, I get the correct order on the following query. The good query returns
the same rows but in the correct order. The only difference between the queries
is that the bad one has an extra, NOP join clause.
Here is the full result of a script showing the problem:
ij version 10.10
ij> connect 'jdbc:derby:memory:db;create=true';
ij> create table t( d int, u varchar( 30 ) );
0 rows inserted/updated/deleted
ij> create table s( d int, u varchar( 30 ) );
0 rows inserted/updated/deleted
ij> call syscs_util.syscs_register_tool( 'databaseMetaData', true );
0 rows inserted/updated/deleted
ij> -- columns are ordered correctly
select t.table_name c2, c.column_name c3
from table( getTables( null, '%', '%' ) ) t,
table( getColumns( null, '%', '%', '%') ) c
where c.table_name = t.table_name
and t.table_type = 'TABLE'
order by c2, c3;
C2
|C3
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
S
|D
S
|U
T
|D
T
|U
4 rows selected
ij> -- columns are ordered incorrectly
select t.table_name c2, c.column_name c3
from table( getTables( null, '%', '%' ) ) t,
table( getColumns( null, '%', '%', '%') ) c
where c.table_name = t.table_name
and t.table_type = 'TABLE'
and c.table_schem = t.table_schem
order by c2, c3;
C2
|C3
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
T
|D
S
|D
T
|U
S
|U
4 rows selected
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