Examples of org.teiid.query.sql.symbol.Expression

org.teiid.query.sql.symbol.Expression
This is the interface for an expression in a SQL string. Expressions can be of several types (see subclasses), but all expressions have a type. These types are used for type checking.

  /**
   * Deep copy of object
   * @return Deep copy of object
   */
  public Object clone() {
      Expression copy = null;
      if(getExpression() != null) { 
          copy = (Expression) getExpression().clone();
      }
        IsNullCriteria criteriaCopy = new IsNullCriteria(copy);
        criteriaCopy.setNegated(isNegated());

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        Constant const1 = new Constant("a"); //$NON-NLS-1$
        Constant const2 = new Constant("b"); //$NON-NLS-1$
        ArrayList thens = new ArrayList();
        thens.add(const1);
        thens.add(const2);
        Expression elseExpression = new Constant("c"); //$NON-NLS-1$
        SearchedCaseExpression expr = new SearchedCaseExpression(whens, thens);
        expr.setElseExpression(elseExpression);
        expr.setType(DataTypeManager.DefaultDataClasses.STRING);
        
        SearchedCaseExpression clone = (SearchedCaseExpression)expr.clone();

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                                                                QueryMetadataException,
                                                                TeiidComponentException {
        List<GroupSymbol> innerGroups = new ArrayList<GroupSymbol>();
        innerGroups.add(new GroupSymbol("pm1.g1")); //$NON-NLS-1$
        
        Expression expr = QueryParser.getQueryParser().parseExpression(expressionSQL);
        
        ResolverVisitor.resolveLanguageObject(expr, FakeMetadataFactory.example1Cached());
        
        assertEquals(dependent, JoinUtil.isNullDependent(FakeMetadataFactory.example1Cached(), innerGroups, expr));
    }

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            case Statement.TYPE_DECLARE:
            case Statement.TYPE_ASSIGNMENT:
        ExpressionStatement exprStmt = (ExpressionStatement) statement;
        // replace variables to references, these references are later
        // replaced in the processor with variable values
        Expression expr = exprStmt.getExpression();
        if (expr != null) {
          expr = rewriteExpressionDirect(expr);
                  exprStmt.setExpression(expr);
        }
        return exprStmt;

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      if (!AggregateSymbol.areAggregatesCardinalityDependent(aggs)) {
        return false;
      }
    } else if (query.getSelect().isDistinct()) {
      for (SingleElementSymbol projectSymbol : query.getSelect().getProjectedSymbols()) {
        Expression ex = SymbolMap.getExpression(projectSymbol);
              if (FunctionCollectorVisitor.isNonDeterministic(ex)) {
                return true;
              }
               if (!ValueIteratorProviderCollectorVisitor.getValueIteratorProviders(ex).isEmpty()) {
                 return true;

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        if (having != null) {
            aggs.addAll(AggregateSymbolCollectorVisitor.getAggregates(having, true));
        }
        for (AggregateSymbol aggregateSymbol : aggs) {
            if (aggregateSymbol.getExpression() != null) {
                Expression expr = aggregateSymbol.getExpression();
                newSelectColumns.add(SymbolMap.getExpression(expr));
            }
        }
        Select innerSelect = new Select();
        int index = 0;

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          unrelatedItems.add(orderBy.getOrderByItems().get(i));
          isUnrelated = (querySymbol instanceof ExpressionSymbol);
          } else {
            querySymbol = (SingleElementSymbol)projectedSymbols.get(index);
          }
          Expression expr = SymbolMap.getExpression(querySymbol);
          if (!previousExpressions.add(expr) || (queryCommand instanceof Query && EvaluatableVisitor.willBecomeConstant(expr))) {
                orderBy.removeOrderByItem(i--);
          } else if (!isUnrelated) {
            orderBy.getOrderByItems().get(i).setSymbol((SingleElementSymbol)querySymbol.clone());
          } else {

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        return rewriteCriteria(newCriteria);
    }


  private Criteria rewriteCriteria(CompareCriteria criteria) throws TeiidComponentException, TeiidProcessingException{
    Expression leftExpr = rewriteExpressionDirect(criteria.getLeftExpression());
    Expression rightExpr = rewriteExpressionDirect(criteria.getRightExpression());
    criteria.setLeftExpression(leftExpr);
    criteria.setRightExpression(rightExpr);


        if (isNull(leftExpr) || isNull(rightExpr)) {
            return UNKNOWN_CRITERIA;

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        }
        CompareCriteria cc = new CompareCriteria();
        cc.setLeftExpression(criteria.getLeftExpression());
        Query q = createInlineViewQuery(new GroupSymbol("X"), criteria.getCommand(), metadata, criteria.getCommand().getProjectedSymbols()); //$NON-NLS-1$
        SingleElementSymbol ses = q.getProjectedSymbols().get(0);
        Expression expr = SymbolMap.getExpression(ses);
        q.getSelect().clearSymbols();
        AggregateSymbol.Type type = Type.MAX;
        if (criteria.getOperator() == CompareCriteria.GT || criteria.getOperator() == CompareCriteria.GE) {
          type = Type.MIN;
        }
        q.getSelect().addSymbol(new AggregateSymbol(ses.getName(), type.name(), false, expr));
        cc.setRightExpression(new ScalarSubquery(q));
      cc.setOperator(criteria.getOperator());
        return rewriteCriteria(cc);
      }


        Expression leftExpr = rewriteExpressionDirect(criteria.getLeftExpression());
        
        if (isNull(leftExpr)) {
            return UNKNOWN_CRITERIA;
        }

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        return criteria;
    }
    
    private Criteria simplifyWithInverse(CompareCriteria criteria) throws TeiidComponentException, TeiidProcessingException{
        Expression leftExpr = criteria.getLeftExpression();
        
        Function leftFunction = (Function) leftExpr;
        if(isSimpleMathematicalFunction(leftFunction)) {
            return simplifyMathematicalCriteria(criteria);
        }

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org.teiid.common.buffer.LobManager

org.teiid.common.buffer.TupleBuffer

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org.teiid.dqp.internal.process.PreparedStatementRequest

org.teiid.query.eval.Evaluator

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org.teiid.query.metadata.TempMetadataStore

org.teiid.query.optimizer.ProcedurePlanner

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