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From sureshsubbiah <...@git.apache.org>
Subject [GitHub] incubator-trafodion pull request: fix #JIRA 1449: missing end key.
Date Thu, 27 Aug 2015 17:04:34 GMT
Github user sureshsubbiah commented on a diff in the pull request:

    https://github.com/apache/incubator-trafodion/pull/66#discussion_r38119659
  
    --- Diff: core/sql/optimizer/SearchKey.cpp ---
    @@ -2711,6 +2716,65 @@ void SearchKey::computeCoveredLeadingKeys()
       }
     }
     
    +void SearchKey::computeFullKeyPredicates(ValueIdSet& predicates)
    +{
    +  // If the key column is an INDEX COLUMN, convert it into a base column
    +  ValueIdList baseKeyCols;
    +
    +  ValueId vid;
    +  const ValueIdList& keyColumns = getKeyColumns();
    +  for (CollIndex i=0; i<keyColumns.entries(); i++ ) {
    +     if ( keyColumns[i].getItemExpr()->getOperatorType() == ITM_INDEXCOLUMN )
    +       vid = ((IndexColumn*)(keyColumns[i].getItemExpr()))->getDefinition();
    +     else
    +       vid = keyColumns[i];
    +
    +     baseKeyCols.insertAt(baseKeyCols.entries(), vid);
    +  }
    +
    +  // compute the # of leading key columns covered by the key columns 
    +  // in the disjunct.
    +   ValueIdSet columnsCoveredByKey;
    +
    +   vid = predicates.init();
    +   for (; predicates.next(vid); predicates.advance(vid)) {
    +
    +      columnsCoveredByKey.clear();
    +      vid.getItemExpr()->findAll(ITM_BASECOLUMN, columnsCoveredByKey, TRUE, TRUE);
    +
    +      // for each vid (or predicate), check the base column list
    +      for (CollIndex i=0; i<baseKeyCols.entries(); i++ ) {
    +
    +         NABoolean found = FALSE;
    +
    +         // the predicate directly refers the base column 
    +         if ( columnsCoveredByKey.containsTheGivenValue(baseKeyCols[i]) ) {
    +            fullKeyPredicates_ += vid;
    +            found = TRUE;
    +         } else {
    --- End diff --
    
    I think we can get a nonlocal predicate if there is a OR (or a CASE)
    
    For example select * from t1 a, t1 b where a.col1 = 1 OR b.col2 = 2 ;
    I think this predicate will get to pushed to both scans. It may end up being a IS NOT
NULL after codegen, precodegen should see the predicate I think.


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