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Key: CORE-6267
Type: Bug Bug
Status: Open Open
Priority: Major Major
Assignee: Unassigned
Reporter: Karol Bieniaszewski
Votes: 0
Watchers: 4
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Firebird Core

CTE with reference to outside alias/column raises error

Created: 23/Mar/20 09:40 AM   Updated: 23/Mar/20 03:34 PM
Component/s: Engine
Affects Version/s: 3.0.5, 3.0.6
Fix Version/s: None

QA Status: No test


 Description  « Hide
Alias "U" is not available in the CTE "ZAWIESZENIA".
If you remove whole WHERE from the main query then an error is raised.
--------------------------
SQL error code = -206
Column unknown
U.UMOWA_DATA_DO
At line 8, column 190.
---------------------------

but if you add whole where no error present.
It can be releated somehow with window functions.

-----------------------------------------------------------------------------------------------------------------------------

WITH DATY_ZAWIESZEN AS
    (
        SELECT date '2020-01-01' AS DZ_OD, date '2020-01-31' AS DZ_DO FROM RDB$DATABASE
    )
    , ZAWIESZENIA AS
    (
        SELECT W_UZ.UMOWA_ID,
               U.UMOWA_DATA_DO /* ------------ ALIAS "U" IS NOT AVAILABLE HERE!!!! ------------ */ AS ZAWIESZ_DATA_DO
          FROM (SELECT 1 AS UMOWA_ID FROM RDB$DATABASE ) W_UZ
               INNER JOIN DATY_ZAWIESZEN W_DZ ON 1=1
    )
SELECT U.UMOWA_ID
  FROM (SELECT CURRENT_DATE AS UMOWA_DATA_DO, 2 AS UMOWA_ID FROM RDB$DATABASE) U
        INNER JOIN DATY_ZAWIESZEN DZ ON 1=1

/* ------------ without this WHERE an error is raised about unknown column UMOWA_DATA_DO ------------ */
    WHERE
        EXISTS
        (
           SELECT *
             FROM ZAWIESZENIA UZ
            WHERE UZ.UMOWA_ID = U.UMOWA_ID
        )

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Vlad Khorsun added a comment - 23/Mar/20 11:41 AM - edited
Without a sub-select in WHERE clause, the main query doesn't reference CTE ZAWIESZENIA.
Engine checks even unused CTE's as it could contain parameter markers. In this case
CTE ZAWIESZENIA itself have no relation with alias U and error is raised. This is correct.

When CTE ZAWIESZENIA is used at WHERE clause it is expanded as derived table and now
it have access to the alias U. I can't say right now if it is correct or not, but this is how thing
works currently.

PS as you see, it have no relation with window functions

Karol Bieniaszewski added a comment - 23/Mar/20 11:53 AM
I have replaced query with your simplification to make issue text clearer

Karol Bieniaszewski made changes - 23/Mar/20 11:53 AM
Field Original Value New Value
Description Look at this not trivial query but migrated to use only system tables to show the problem.

Alias "U" is not available in the CTE "ZAWIESZENIA".
If you remove whole WHERE from the main query then an error is raised.
--------------------------
SQL error code = -206
Column unknown
U.UMOWA_DATA_DO
At line 8, column 190.
---------------------------

but if you add whole where no error present.
It can be releated somehow with window functions.

-----------------------------------------------------------------------------------------------------------------------------

WITH DATY_ZAWIESZEN AS
(
SELECT date '2020-01-01' AS DZ_OD, date '2020-01-31' AS DZ_DO FROM RDB$DATABASE
)
, ZAWIESZENIA AS
(
SELECT
W_UZ.RDB$RELATION_ID, W_UZ.RDB$CHARACTER_SET_NAME, W_UZ.UMOWA_ID, MAXVALUE(W_UZ.ZAWIESZ_DATA_OD, W_U.UMOWA_DATA_OD) AS ZAWIESZ_DATA_OD, MINVALUE(COALESCE(W_UZ.ZAWIESZ_DATA_DO, W_DZ.DZ_DO), U.UMOWA_DATA_DO /* ------------ ALIAS "U" IS NOT AVAILABLE HERE!!!! ------------ */) AS ZAWIESZ_DATA_DO
FROM
(SELECT CURRENT_DATE AS ZAWIESZ_DATA_OD, CURRENT_DATE AS ZAWIESZ_DATA_DO, RDB$RELATION_ID, RDB$CHARACTER_SET_NAME, 1 AS UMOWA_ID FROM RDB$DATABASE ) W_UZ
INNER JOIN (SELECT CURRENT_DATE AS UMOWA_DATA_OD FROM RDB$DATABASE ) W_U ON 1=1
INNER JOIN DATY_ZAWIESZEN W_DZ ON 1=1
)

SELECT
U.UMOWA_ID
FROM
(SELECT CURRENT_DATE AS UMOWA_DATA_DO, 2 AS UMOWA_ID FROM RDB$DATABASE) U
INNER JOIN DATY_ZAWIESZEN DZ ON 1=1
/* ------------ without this WHERE an error is raised about unknown column UMOWA_DATA_DO ------------ */
WHERE
    EXISTS
    (
        SELECT
        *
        FROM
            (
            SELECT
                  ISLANDS.UMOWA_ID
                , ISLANDS.ISLAND_NR
                , MIN(ISLANDS.START_DATE) AS ISLAND_START_DATE
             , MAX(ISLANDS.END_DATE) AS ISLAND_END_DATE
            FROM
             (SELECT
             GROUPS.*
             , CASE WHEN GROUPS.PREV_END_DATE >= START_DATE THEN 0 ELSE 1 END AS IS_ISLAND_START
             , SUM(CASE WHEN GROUPS.PREV_END_DATE >= START_DATE THEN 0 ELSE 1 END) OVER (PARTITION BY GROUPS.UMOWA_ID ORDER BY GROUPS.RN) AS ISLAND_NR
                 FROM
             (SELECT
             ROW_NUMBER() OVER(PARTITION BY UZ.UMOWA_ID ORDER BY UZ.ZAWIESZ_DATA_OD, COALESCE(UZ.ZAWIESZ_DATA_DO, DZ.DZ_DO)) AS RN
                        , UZ.UMOWA_ID
                        , UZ.ZAWIESZ_DATA_OD AS START_DATE
                        , COALESCE(UZ.ZAWIESZ_DATA_DO, DZ.DZ_DO) AS END_DATE
                        , LAG(COALESCE(UZ.ZAWIESZ_DATA_DO, DZ.DZ_DO), 1) OVER(PARTITION BY UZ.UMOWA_ID ORDER BY UZ.ZAWIESZ_DATA_OD, COALESCE(UZ.ZAWIESZ_DATA_DO, DZ.DZ_DO)) AS PREV_END_DATE
                        FROM ZAWIESZENIA UZ
                        WHERE
                        UZ.UMOWA_ID=U.UMOWA_ID
                   ) GROUPS
                ) ISLANDS
            GROUP BY
             ISLANDS.UMOWA_ID
                        , ISLANDS.ISLAND_NR
            ORDER BY
             ISLAND_START_DATE
            ) X
        WHERE
        DZ.DZ_OD>=X.ISLAND_START_DATE AND DZ.DZ_DO<=X.ISLAND_END_DATE
    )
Look at this not trivial query but migrated to use only system tables to show the problem.

Alias "U" is not available in the CTE "ZAWIESZENIA".
If you remove whole WHERE from the main query then an error is raised.
--------------------------
SQL error code = -206
Column unknown
U.UMOWA_DATA_DO
At line 8, column 190.
---------------------------

but if you add whole where no error present.
It can be releated somehow with window functions.

-----------------------------------------------------------------------------------------------------------------------------

WITH DATY_ZAWIESZEN AS
    (
        SELECT date '2020-01-01' AS DZ_OD, date '2020-01-31' AS DZ_DO FROM RDB$DATABASE
    )

    , ZAWIESZENIA AS
    (
        SELECT W_UZ.UMOWA_ID,
               U.UMOWA_DATA_DO /* ------------ ALIAS "U" IS NOT AVAILABLE HERE!!!! ------------ */ AS ZAWIESZ_DATA_DO
          FROM (SELECT 1 AS UMOWA_ID FROM RDB$DATABASE ) W_UZ
               INNER JOIN DATY_ZAWIESZEN W_DZ ON 1=1
    )

SELECT U.UMOWA_ID
  FROM (SELECT CURRENT_DATE AS UMOWA_DATA_DO, 2 AS UMOWA_ID FROM RDB$DATABASE) U
        INNER JOIN DATY_ZAWIESZEN DZ ON 1=1

/* ------------ without this WHERE an error is raised about unknown column UMOWA_DATA_DO ------------ */
    WHERE
        EXISTS
        (
           SELECT *
             FROM ZAWIESZENIA UZ
            WHERE UZ.UMOWA_ID = U.UMOWA_ID
        )
Sean Leyne made changes - 23/Mar/20 03:32 PM
Summary Not avaiable alias is used inside CTE without an error CTE with reference to outside alias/column raises error
Description Look at this not trivial query but migrated to use only system tables to show the problem.

Alias "U" is not available in the CTE "ZAWIESZENIA".
If you remove whole WHERE from the main query then an error is raised.
--------------------------
SQL error code = -206
Column unknown
U.UMOWA_DATA_DO
At line 8, column 190.
---------------------------

but if you add whole where no error present.
It can be releated somehow with window functions.

-----------------------------------------------------------------------------------------------------------------------------

WITH DATY_ZAWIESZEN AS
    (
        SELECT date '2020-01-01' AS DZ_OD, date '2020-01-31' AS DZ_DO FROM RDB$DATABASE
    )

    , ZAWIESZENIA AS
    (
        SELECT W_UZ.UMOWA_ID,
               U.UMOWA_DATA_DO /* ------------ ALIAS "U" IS NOT AVAILABLE HERE!!!! ------------ */ AS ZAWIESZ_DATA_DO
          FROM (SELECT 1 AS UMOWA_ID FROM RDB$DATABASE ) W_UZ
               INNER JOIN DATY_ZAWIESZEN W_DZ ON 1=1
    )

SELECT U.UMOWA_ID
  FROM (SELECT CURRENT_DATE AS UMOWA_DATA_DO, 2 AS UMOWA_ID FROM RDB$DATABASE) U
        INNER JOIN DATY_ZAWIESZEN DZ ON 1=1

/* ------------ without this WHERE an error is raised about unknown column UMOWA_DATA_DO ------------ */
    WHERE
        EXISTS
        (
           SELECT *
             FROM ZAWIESZENIA UZ
            WHERE UZ.UMOWA_ID = U.UMOWA_ID
        )
Alias "U" is not available in the CTE "ZAWIESZENIA".
If you remove whole WHERE from the main query then an error is raised.
--------------------------
SQL error code = -206
Column unknown
U.UMOWA_DATA_DO
At line 8, column 190.
---------------------------

but if you add whole where no error present.
It can be releated somehow with window functions.

-----------------------------------------------------------------------------------------------------------------------------

WITH DATY_ZAWIESZEN AS
    (
        SELECT date '2020-01-01' AS DZ_OD, date '2020-01-31' AS DZ_DO FROM RDB$DATABASE
    )
    , ZAWIESZENIA AS
    (
        SELECT W_UZ.UMOWA_ID,
               U.UMOWA_DATA_DO /* ------------ ALIAS "U" IS NOT AVAILABLE HERE!!!! ------------ */ AS ZAWIESZ_DATA_DO
          FROM (SELECT 1 AS UMOWA_ID FROM RDB$DATABASE ) W_UZ
               INNER JOIN DATY_ZAWIESZEN W_DZ ON 1=1
    )
SELECT U.UMOWA_ID
  FROM (SELECT CURRENT_DATE AS UMOWA_DATA_DO, 2 AS UMOWA_ID FROM RDB$DATABASE) U
        INNER JOIN DATY_ZAWIESZEN DZ ON 1=1

/* ------------ without this WHERE an error is raised about unknown column UMOWA_DATA_DO ------------ */
    WHERE
        EXISTS
        (
           SELECT *
             FROM ZAWIESZENIA UZ
            WHERE UZ.UMOWA_ID = U.UMOWA_ID
        )
Sean Leyne added a comment - 23/Mar/20 03:34 PM
I always understood that 'external' references needed to be passed to CTE via parameters, that the CTE could not reference external alias/columns.