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From "Stefan Cordes (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3023) Different result rows depending on the sequence of INNER JOIN and OUTER JOIN
Date Thu, 23 Aug 2007 08:32:31 GMT
Different result rows depending on the sequence of INNER JOIN and OUTER JOIN
----------------------------------------------------------------------------

                 Key: DERBY-3023
                 URL: https://issues.apache.org/jira/browse/DERBY-3023
             Project: Derby
          Issue Type: Bug
          Components: SQL
    Affects Versions: 10.3.1.4, 10.2.2.0, 10.1.2.1
         Environment: Windows XP, Java 1.4.2
            Reporter: Stefan Cordes


We have a complex SQL joining 11 Tables via INNER JOIN and OUTER JOIN.
These SQLs were tested against an z/OS DB2 Version 8.
After moving to our local platform with Derby we found out the resultsets returned by the
SQLs were too less.

I tested our "old style" SQL which results in 889 rows.
Our new style SQL expected to give similar rows but gives *0*.

After some work we found a workaround: first place all the "INNER JOIN"s in the SQL and then
the "OUTER JOIN"s.

{code:title=Result of testprogram}
Derby=10.3-b561794
Test 10.3-b561794-old-style-sql
889 Rows in 1703ms
Test 10.3-b561794-new-style-sql
0 Rows in 563ms  _(expected 924 rows instead)_
Test 10.3-b561794-new-style-sql-only-inner
2 Rows in 766ms _(only inner joins, no outer joins but larger result)_
Test 10.3-b561794-new-style-sql_first-inner-joins
924 Rows in 578ms
Test 10.3-b561794-new-style-sql_without-condition
924 Rows in 438ms
{code}

Here our initial used SQL:
{code:title=SQL giving wrong result (0 rows)}
SELECT O4Work.ESVN01.NU_BUY_CPY AS PO_BuyCompanyNo, O4Work.ESVN01.NU_ODR AS PO_Number, O4Work.ESVN01.FL_ODR_CAE
AS PO_Type, O4Work.ESVN01.NU_MCS_SPY AS PO_SupplierNo, O4Work.ESVN01.NU_ST3 AS PO_StatusNo,
O4Work.ESVN01.DA_SPY_COY_PRT AS PO_SCPrintDate, O4Work.ESVN01.FL_SAS AS PO_SeasFlag, CASE
WHEN (SELECT COUNT(O4Work.ESVNA5.ID_PTE) FROM O4Work.ESVNA5 WHERE O4Work.ESVN02.NU_BUY_CPY
= O4Work.ESVNA5.NU_BUY_CPY AND O4Work.ESVN02.NU_ODR = O4Work.ESVNA5.NU_ODR AND O4Work.ESVN02.NU_PST
= O4Work.ESVNA5.NU_PST) = 0 THEN 'N' ELSE 'Y' END AS POPA_PictureID, CASE WHEN (SELECT COUNT(O4Work.ESVNG3.NU_ODR)
FROM O4Work.ESVNG3 WHERE O4Work.ESVN01.NU_BUY_CPY = O4Work.ESVNG3.NU_BUY_CPY AND O4Work.ESVN01.NU_ODR
= O4Work.ESVNG3.NU_ODR) = 0 THEN 'N' ELSE 'Y' END AS ON_ID, O4Work.ESVN02.NU_PST AS POP_Position_Id,
O4Work.ESVN02.NU_CTT AS POP_ContractNo, O4Work.ESVN02.NU_ARO_CTT AS POP_ArosContractNo, O4Work.ESVN02.NU_ST3
AS POP_StatusNo, O4Work.ESVN02.DA_CAE AS POP_CreationDate, O4Work.ESVN02.DA_LAT_AMD AS POP_LastAmendDate,
O4Work.ESVNA0.NU_SSN_IDE AS POPD_SeasonInd,  O4Work.ESVNA0.NU_STL_ID1 AS POPD_StyleId, O4Work.ESVNA0.NU_SRY_ID1
AS POPD_StoryID, O4Work.ESVNA0.NU_LC1 AS POPD_LicenseID, O4Work.ESVP00.NU_CSY AS SER_ClassNo,
O4Work.ESVP00.NU_COE AS SER_CodeNo, O4Work.ESVP00.NU_SRL AS SER_SerialNo, O4Work.ESVP00.NU_PIK_MOD
AS SER_PickingM, O4Work.ESVN03.NU_MT1_CPY AS POPC_MasterCpyNo, O4Work.ESVN03.QU_ODR AS POPC_OrderedQty,
O4Work.ESVN03.DA_EDD AS POPC_Edd, O4Work.ESVN03.DA_LDD AS POPC_Ldd, O4Work.ESVN03.DA_PAD AS
POPC_Pad, O4Work.ESVN03.DA_SAD AS POPC_Sad, O4Work.ESVN03.PR_SCP AS POPC_SupCstPrice, O4Work.ESVN03.NU_SCP_CR1
AS POPC_SupCstPrCurr, O4Work.ESVN03.NU_ST3 AS POPC_StatusNo, O4Work.ESVN03.NU_COY_FRM_ODR
AS POPC_Src_PO_Number, O4Work.ESVN03.NU_COY_UTL_ODR AS POPC_Tgt_PO_Number, O4Work.ESVN03.DA_FLR_RDY
AS POPC_FRM_DATE, O4Work.ESVN03.FL_CSG AS POPC_CS_FLAG, O4Work.ESVN03.NU_PAK_MOD_SPY AS POPC_PackSupplNo,
O4Work.ESVN03.NU_PAK_MOD_DCR AS POPC_PackingDCNo, O4Work.ESVN03.NU_PS2_MOD AS POPC_PresMethodNo,
O4Work.ESVN04.NU_RTL_CPY AS POPRC_RetailCode, O4Work.ESVN04.PR_PLN_SEL AS POPRC_SellPrice,
O4Work.ESVN04.NU_PLN_SEL_PRC_CR1 AS POPRC_SellPrCurr, O4Work.ESVN08.NU_AVE AS POPRCA_AdvertNo,
O4Work.ESVQ00.ID_SHP AS SHP_ShippingID, O4Work.ESVQ00.NU_SHP AS SHP_ShippingNo, O4Work.ESVNB0.NU_NTL_PDE_ID1
AS POPDC_NationalID, O4Work.ESVNB0.NU_EQP AS POPDC_EquipNumber, O4Work.ESVNE1.PE_OMU AS POPCC_OMU,
CASE WHEN (SELECT COUNT(O4Work.ESVN07.NU_ODR) FROM O4Work.ESVN07 WHERE O4Work.ESVN03.NU_BUY_CPY
= O4Work.ESVN07.NU_BUY_CPY AND O4Work.ESVN03.NU_MT1_CPY = O4Work.ESVN07.NU_MT1_CPY AND O4Work.ESVN03.NU_ODR
= O4Work.ESVN07.NU_ODR AND O4Work.ESVN03.NU_PST = O4Work.ESVN07.NU_PST AND O4Work.ESVN07.FL_ALE_RMK
= 'Y') = 0 THEN 'N' ELSE 'Y' END AS POPCU_AllocRem FROM O4Work.ESVN02 
INNER JOIN O4Work.ESVN01 ON O4Work.ESVN02.NU_BUY_CPY = O4Work.ESVN01.NU_BUY_CPY AND O4Work.ESVN02.NU_ODR
= O4Work.ESVN01.NU_ODR 
INNER JOIN O4Work.ESVNA0 ON O4Work.ESVN02.NU_BUY_CPY = O4Work.ESVNA0.NU_BUY_CPY AND O4Work.ESVN02.NU_ODR
= O4Work.ESVNA0.NU_ODR AND O4Work.ESVN02.NU_PST = O4Work.ESVNA0.NU_PST 
INNER JOIN O4Work.ESVP00 ON O4Work.ESVNA0.ID_SRL = O4Work.ESVP00.ID_SRL 
LEFT OUTER JOIN O4Work.ESVNA4 ON O4Work.ESVNA0.NU_BUY_CPY = O4Work.ESVNA4.NU_BUY_CPY AND O4Work.ESVNA0.NU_ODR
= O4Work.ESVNA4.NU_ODR AND O4Work.ESVNA0.NU_PST = O4Work.ESVNA4.NU_PST 
INNER JOIN O4Work.ESVN03 ON O4Work.ESVN02.NU_BUY_CPY = O4Work.ESVN03.NU_BUY_CPY AND O4Work.ESVN02.NU_ODR
= O4Work.ESVN03.NU_ODR AND O4Work.ESVN02.NU_PST = O4Work.ESVN03.NU_PST 
LEFT OUTER JOIN O4Work.ESVN04 ON O4Work.ESVN03.NU_BUY_CPY = O4Work.ESVN04.NU_BUY_CPY AND O4Work.ESVN03.NU_MT1_CPY
= O4Work.ESVN04.NU_MT1_CPY AND O4Work.ESVN03.NU_ODR = O4Work.ESVN04.NU_ODR AND O4Work.ESVN03.NU_PST
= O4Work.ESVN04.NU_PST 
LEFT OUTER JOIN O4Work.ESVN08 ON O4Work.ESVN04.NU_BUY_CPY = O4Work.ESVN08.NU_BUY_CPY AND O4Work.ESVN04.NU_RTL_CPY
= O4Work.ESVN08.NU_RTL_CPY AND O4Work.ESVN04.NU_MT1_CPY = O4Work.ESVN08.NU_MT1_CPY AND O4Work.ESVN04.NU_ODR
= O4Work.ESVN08.NU_ODR AND O4Work.ESVN04.NU_PST = O4Work.ESVN08.NU_PST 
INNER JOIN O4Work.ESVQ00 ON O4Work.ESVN03.ID_SHP = O4Work.ESVQ00.ID_SHP 
INNER JOIN O4Work.ESVNB0 ON O4Work.ESVN03.NU_BUY_CPY = O4Work.ESVNB0.NU_BUY_CPY AND O4Work.ESVN03.NU_MT1_CPY
= O4Work.ESVNB0.NU_MT1_CPY AND O4Work.ESVN03.NU_ODR = O4Work.ESVNB0.NU_ODR AND O4Work.ESVN03.NU_PST
= O4Work.ESVNB0.NU_PST 
INNER JOIN O4Work.ESVNE1 ON O4Work.ESVN03.NU_BUY_CPY = O4Work.ESVNE1.NU_BUY_CPY AND O4Work.ESVN03.NU_MT1_CPY
= O4Work.ESVNE1.NU_MT1_CPY AND O4Work.ESVN03.NU_ODR = O4Work.ESVNE1.NU_ODR AND O4Work.ESVN03.NU_PST
= O4Work.ESVNE1.NU_PST 
WHERE O4Work.ESVN01.NU_BUY_CPY = 99 AND O4Work.ESVNA0.NU_CPY_GRP = 0
{code}
and the one with moved inner joins:
{code:title=SQL giving correct result (924 rows)}
SELECT O4Work.ESVN01.NU_BUY_CPY AS PO_BuyCompanyNo, O4Work.ESVN01.NU_ODR AS PO_Number, O4Work.ESVN01.FL_ODR_CAE
AS PO_Type, O4Work.ESVN01.NU_MCS_SPY AS PO_SupplierNo, O4Work.ESVN01.NU_ST3 AS PO_StatusNo,
O4Work.ESVN01.DA_SPY_COY_PRT AS PO_SCPrintDate, O4Work.ESVN01.FL_SAS AS PO_SeasFlag, CASE
WHEN (SELECT COUNT(O4Work.ESVNA5.ID_PTE) FROM O4Work.ESVNA5 WHERE O4Work.ESVN02.NU_BUY_CPY
= O4Work.ESVNA5.NU_BUY_CPY AND O4Work.ESVN02.NU_ODR = O4Work.ESVNA5.NU_ODR AND O4Work.ESVN02.NU_PST
= O4Work.ESVNA5.NU_PST) = 0 THEN 'N' ELSE 'Y' END AS POPA_PictureID, CASE WHEN (SELECT COUNT(O4Work.ESVNG3.NU_ODR)
FROM O4Work.ESVNG3 WHERE O4Work.ESVN01.NU_BUY_CPY = O4Work.ESVNG3.NU_BUY_CPY AND O4Work.ESVN01.NU_ODR
= O4Work.ESVNG3.NU_ODR) = 0 THEN 'N' ELSE 'Y' END AS ON_ID, O4Work.ESVN02.NU_PST AS POP_Position_Id,
O4Work.ESVN02.NU_CTT AS POP_ContractNo, O4Work.ESVN02.NU_ARO_CTT AS POP_ArosContractNo, O4Work.ESVN02.NU_ST3
AS POP_StatusNo, O4Work.ESVN02.DA_CAE AS POP_CreationDate, O4Work.ESVN02.DA_LAT_AMD AS POP_LastAmendDate,
O4Work.ESVNA0.NU_SSN_IDE AS POPD_SeasonInd,  O4Work.ESVNA0.NU_STL_ID1 AS POPD_StyleId, O4Work.ESVNA0.NU_SRY_ID1
AS POPD_StoryID, O4Work.ESVNA0.NU_LC1 AS POPD_LicenseID, O4Work.ESVP00.NU_CSY AS SER_ClassNo,
O4Work.ESVP00.NU_COE AS SER_CodeNo, O4Work.ESVP00.NU_SRL AS SER_SerialNo, O4Work.ESVP00.NU_PIK_MOD
AS SER_PickingM, O4Work.ESVN03.NU_MT1_CPY AS POPC_MasterCpyNo, O4Work.ESVN03.QU_ODR AS POPC_OrderedQty,
O4Work.ESVN03.DA_EDD AS POPC_Edd, O4Work.ESVN03.DA_LDD AS POPC_Ldd, O4Work.ESVN03.DA_PAD AS
POPC_Pad, O4Work.ESVN03.DA_SAD AS POPC_Sad, O4Work.ESVN03.PR_SCP AS POPC_SupCstPrice, O4Work.ESVN03.NU_SCP_CR1
AS POPC_SupCstPrCurr, O4Work.ESVN03.NU_ST3 AS POPC_StatusNo, O4Work.ESVN03.NU_COY_FRM_ODR
AS POPC_Src_PO_Number, O4Work.ESVN03.NU_COY_UTL_ODR AS POPC_Tgt_PO_Number, O4Work.ESVN03.DA_FLR_RDY
AS POPC_FRM_DATE, O4Work.ESVN03.FL_CSG AS POPC_CS_FLAG, O4Work.ESVN03.NU_PAK_MOD_SPY AS POPC_PackSupplNo,
O4Work.ESVN03.NU_PAK_MOD_DCR AS POPC_PackingDCNo, O4Work.ESVN03.NU_PS2_MOD AS POPC_PresMethodNo,
O4Work.ESVN04.NU_RTL_CPY AS POPRC_RetailCode, O4Work.ESVN04.PR_PLN_SEL AS POPRC_SellPrice,
O4Work.ESVN04.NU_PLN_SEL_PRC_CR1 AS POPRC_SellPrCurr, O4Work.ESVN08.NU_AVE AS POPRCA_AdvertNo,
O4Work.ESVQ00.ID_SHP AS SHP_ShippingID, O4Work.ESVQ00.NU_SHP AS SHP_ShippingNo, O4Work.ESVNB0.NU_NTL_PDE_ID1
AS POPDC_NationalID, O4Work.ESVNB0.NU_EQP AS POPDC_EquipNumber, O4Work.ESVNE1.PE_OMU AS POPCC_OMU,
CASE WHEN (SELECT COUNT(O4Work.ESVN07.NU_ODR) FROM O4Work.ESVN07 WHERE O4Work.ESVN03.NU_BUY_CPY
= O4Work.ESVN07.NU_BUY_CPY AND O4Work.ESVN03.NU_MT1_CPY = O4Work.ESVN07.NU_MT1_CPY AND O4Work.ESVN03.NU_ODR
= O4Work.ESVN07.NU_ODR AND O4Work.ESVN03.NU_PST = O4Work.ESVN07.NU_PST AND O4Work.ESVN07.FL_ALE_RMK
= 'Y') = 0 THEN 'N' ELSE 'Y' END AS POPCU_AllocRem FROM O4Work.ESVN02 
INNER JOIN O4Work.ESVN01 ON O4Work.ESVN02.NU_BUY_CPY = O4Work.ESVN01.NU_BUY_CPY AND O4Work.ESVN02.NU_ODR
= O4Work.ESVN01.NU_ODR 
INNER JOIN O4Work.ESVNA0 ON O4Work.ESVN02.NU_BUY_CPY = O4Work.ESVNA0.NU_BUY_CPY AND O4Work.ESVN02.NU_ODR
= O4Work.ESVNA0.NU_ODR AND O4Work.ESVN02.NU_PST = O4Work.ESVNA0.NU_PST 
INNER JOIN O4Work.ESVP00 ON O4Work.ESVNA0.ID_SRL = O4Work.ESVP00.ID_SRL 
INNER JOIN O4Work.ESVN03 ON O4Work.ESVN02.NU_BUY_CPY = O4Work.ESVN03.NU_BUY_CPY AND O4Work.ESVN02.NU_ODR
= O4Work.ESVN03.NU_ODR AND O4Work.ESVN02.NU_PST = O4Work.ESVN03.NU_PST 
INNER JOIN O4Work.ESVNB0 ON O4Work.ESVN03.NU_BUY_CPY = O4Work.ESVNB0.NU_BUY_CPY AND O4Work.ESVN03.NU_MT1_CPY
= O4Work.ESVNB0.NU_MT1_CPY AND O4Work.ESVN03.NU_ODR = O4Work.ESVNB0.NU_ODR AND O4Work.ESVN03.NU_PST
= O4Work.ESVNB0.NU_PST 
INNER JOIN O4Work.ESVQ00 ON O4Work.ESVN03.ID_SHP = O4Work.ESVQ00.ID_SHP 
LEFT OUTER JOIN O4Work.ESVNA4 ON O4Work.ESVNA0.NU_BUY_CPY = O4Work.ESVNA4.NU_BUY_CPY AND O4Work.ESVNA0.NU_ODR
= O4Work.ESVNA4.NU_ODR AND O4Work.ESVNA0.NU_PST = O4Work.ESVNA4.NU_PST 
LEFT OUTER JOIN O4Work.ESVN04 ON O4Work.ESVN03.NU_BUY_CPY = O4Work.ESVN04.NU_BUY_CPY AND O4Work.ESVN03.NU_MT1_CPY
= O4Work.ESVN04.NU_MT1_CPY AND O4Work.ESVN03.NU_ODR = O4Work.ESVN04.NU_ODR AND O4Work.ESVN03.NU_PST
= O4Work.ESVN04.NU_PST 
LEFT OUTER JOIN O4Work.ESVN08 ON O4Work.ESVN04.NU_BUY_CPY = O4Work.ESVN08.NU_BUY_CPY AND O4Work.ESVN04.NU_RTL_CPY
= O4Work.ESVN08.NU_RTL_CPY AND O4Work.ESVN04.NU_MT1_CPY = O4Work.ESVN08.NU_MT1_CPY AND O4Work.ESVN04.NU_ODR
= O4Work.ESVN08.NU_ODR AND O4Work.ESVN04.NU_PST = O4Work.ESVN08.NU_PST 
INNER JOIN O4Work.ESVNE1 ON O4Work.ESVN03.NU_BUY_CPY = O4Work.ESVNE1.NU_BUY_CPY AND O4Work.ESVN03.NU_MT1_CPY
= O4Work.ESVNE1.NU_MT1_CPY AND O4Work.ESVN03.NU_ODR = O4Work.ESVNE1.NU_ODR AND O4Work.ESVN03.NU_PST
= O4Work.ESVNE1.NU_PST 
WHERE O4Work.ESVN01.NU_BUY_CPY = 99 AND O4Work.ESVNA0.NU_CPY_GRP = 0
{code}

Another curious behavior is that leaving out the condition {{O4Work.ESVNA0.NU_CPY_GRP = 0}}
in the first SQL will give us the result of 924 all having O4Work.ESVNA0.NU_CPY_GRP = 0. So
evaluation of the condition is buggy, too.

I think there may be a dependency between this issue and these ones:
[DERBY-1681|http://issues.apache.org/jira/browse/DERBY-1681] (Regression (wrong results):
Join predicate can be ignored for left-most child in a chain of nested unions.)
[DERBY-1633|https://issues.apache.org/jira/browse/DERBY-1633] (Regression: The fields of views
are not being calculated properly since 10.1.2.4)

Attached is an Eclipse project with the Test-Program (without the Derby-Libraries) and the
several RUNTIMESTATISTICS.

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