IT20882: ESQL SELECT STATEMENT LOSES ARRAY REFERENCE DURING OPTIMIZATION

APAR status

• Closed as program error.

Error description

• If an ESQL SELECT statement similar to the following is used
  
  SET OutputRoot.XMLNSC.TESTOUT.ANOTHERTREE =
    (SELECT (CASE EXISTS(ABRANCH.LEAF?]) WHEN TRUE THEN
      ABRANCH.*:LEAF END) AS TWIG
    FROM InputRoot.XMLNSC.TEST.BRANCH AS ABRANCH);
  
  where two field references in the select list reference the
  same field and the furthest right one is not an array reference
  then the array reference is lost during optimization and if a
  function such as EXISTS tries to use this field reference then
  the following error messages is  seen:
  
  BIP2505E: SqlExistsFunctionCall::evaluate() "The operand must
  be a list" ?.computeModule.Main, 3.127, EXISTS, 1]" thrown in
  the test body.
  
  Additional Symptom(s) Search Keyword(s):
  

Local fix

• NA
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of ESQL who perform SELECT operations.
  
  
  Platforms affected:
  z/OS, MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  If an ESQL SELECT statement similar to the following is used
  
  SET OutputRoot.XMLNSC.TESTOUT.ANOTHERTREE =
    (SELECT (CASE EXISTS(ABRANCH.LEAF?]) WHEN TRUE THEN
      ABRANCH.*:LEAF END) AS TWIG
    FROM InputRoot.XMLNSC.TEST.BRANCH AS ABRANCH);
  
  where two field references in the select list reference the
  same field and the furthest right one is not an array reference
  then the array reference is lost during optimization and if a
  function such as EXISTS tries to use this field reference then
  the following error messages is  seen:
  
  BIP2505E: SqlExistsFunctionCall::evaluate() "The operand must
  be a list" ?.computeModule.Main, 3.127, EXISTS, 1]" thrown in
  the test body.
  

Problem conclusion

• The ESQL SELECT optimization code has been updated to
  distinguish between field references which have array specifiers
  and those which do not.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v10.0      10.0.0.10
  v9.0       9.0.0.9
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  INTEGRATION BUS

• Fixed component ID

  5724J0530

Applicable component levels

• R900 PSY

     UP