"ai" <listar@mail.ru> wrote:
> Oops.. I just saw, that I send you "correct" (already with
"workaround")
> sql-code instead of "wrong"...
> here is "wrong" (difference is in "SELECT sub3.key3, sub4.value2
FROM" ):
OK, that is still happening, and looks wrong to me. The outermost LEFT
JOIN is between this:
test=# SELECT * FROM (SELECT 1 as key1) sub1;
key1
------
1
(1 row)
as sub1 and this:
test=# SELECT sub3.key3, sub4.value2
test-# FROM (SELECT 1 as key3) sub3
test-# LEFT JOIN
test-# (
test(# SELECT sub5.key5, COALESCE(sub6.value1, 1) as
value2
test(# FROM (SELECT 1 as key5) sub5
test(# LEFT JOIN
test(# (
test(# SELECT 1 as key6, value1
test(# FROM (SELECT NULL::integer as value1) sub7
test(# WHERE false
test(# ) sub6 ON false
test(# ) sub4 ON sub4.key5=sub3.key3;
key3 | value2
------+--------
1 | 1
(1 row)
as sub2 joining on sub1.key1 = sub2.key3. Yet:
test=# SELECT *
test-# FROM (SELECT 1 as key1) sub1
test-# LEFT JOIN
test-# (
test(# SELECT sub3.key3, sub4.value2
test(# FROM (SELECT 1 as key3) sub3
test(# LEFT JOIN
test(# (
test(# SELECT sub5.key5, COALESCE(sub6.value1, 1) as
value2
test(# FROM (SELECT 1 as key5) sub5
test(# LEFT JOIN
test(# (
test(# SELECT 1 as key6, value1
test(# FROM (SELECT NULL::integer as value1) sub7
test(# WHERE false
test(# ) sub6 ON false
test(# ) sub4 ON sub4.key5=sub3.key3
test(# ) sub2 ON sub1.key1 = sub2.key3;
key1 | key3 | value2
------+------+--------
1 | 1 |
(1 row)
This is on HEAD from today. Clearly there's a problem.
-Kevin