[DERBY-3023] Different result rows depending on the sequence of INNER JOIN and OUTER JOIN

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 10.1.2.1, 10.2.2.0, 10.3.1.4
• Fix Version/s: 10.1.3.2, 10.2.2.1, 10.3.3.0, 10.4.1.3
• Component/s: SQL
• Environment: Windows XP, Java 1.4.2
• Issue & fix info: Release Note Needed
• Assignee: A B
• Reporter: Stefan Cordes
• Created: 23/Aug/07 08:32
• Updated: 25/Sep/12 15:46
• Resolved: 16/Jan/08 16:52

Description

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.

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

Here our initial used SQL:

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

and the one with moved inner joins:

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

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 (Regression (wrong results): Join predicate can be ignored for left-most child in a chain of nested unions.)
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.

Issue Links

• is part of: DERBY-2034 Tracking of bugs that lead to incorrect results being stored or returned to the client
• relates to: DERBY-2526 Wrong results with queries that use the JOIN ... ON syntax to join with views or other non-base table expressions.
• relates to: DERBY-5933 SQL sorting error