public List getCollectionFromElements() 
{
		return collectionFromElements;
}

 public String[][] getColumnNames() 
{
		return columnNames;
}

The column alias names being used in the generated SQL.

 public Constructor getConstructor() 
{
		return constructorNode == null ? null : constructorNode.getConstructor();
}

The constructor to use for dynamic instantiation queries.

 protected AST getFirstSelectExpression() 
{
		AST n = getFirstChild();
		// Skip 'DISTINCT' and 'ALL', so we return the first expression node.
		while ( n != null && ( n.getType() == SqlTokenTypes.DISTINCT || n.getType() == SqlTokenTypes.ALL ) ) {
			n = n.getNextSibling();
		}
		return n;
}

 public List getFromElementsForLoad() 
{
		return fromElementsForLoad;
}

FromElements which need to be accounted for in the load phase (either for return or for fetch).

 public String[] getQueryReturnAliases() 
{
		return aliases;
}

The HQL aliases, or generated aliases

 public Type[] getQueryReturnTypes() 
{
		return queryReturnTypes;
}

The types actually being returned from this query at the "object level".

 public  void initializeDerivedSelectClause(FromClause fromClause) throws SemanticException 
{
		if ( prepared ) {
			throw new IllegalStateException( "SelectClause was already prepared!" );
		}
		//Used to be tested by the TCK but the test is no longer here
//		if ( getSessionFactoryHelper().isStrictJPAQLComplianceEnabled() && !getWalker().isSubQuery() ) {
//			// NOTE : the isSubQuery() bit is a temporary hack...
//			throw new QuerySyntaxException( "JPA-QL compliance requires select clause" );
//		}
		List fromElements = fromClause.getProjectionList();
		ASTAppender appender = new ASTAppender( getASTFactory(), this );	// Get ready to start adding nodes.
		int size = fromElements.size();
		ArrayList sqlResultTypeList = new ArrayList( size );
		ArrayList queryReturnTypeList = new ArrayList( size );
		Iterator iterator = fromElements.iterator();
		for ( int k = 0; iterator.hasNext(); k++ ) {
			FromElement fromElement = ( FromElement ) iterator.next();
			Type type = fromElement.getSelectType();
			addCollectionFromElement( fromElement );
			if ( type != null ) {
				boolean collectionOfElements = fromElement.isCollectionOfValuesOrComponents();
				if ( !collectionOfElements ) {
					if ( !fromElement.isFetch() ) {
						// Add the type to the list of returned sqlResultTypes.
						queryReturnTypeList.add( type );
					}
					fromElementsForLoad.add( fromElement );
					sqlResultTypeList.add( type );
					// Generate the select expression.
					String text = fromElement.renderIdentifierSelect( size, k );
					SelectExpressionImpl generatedExpr = ( SelectExpressionImpl ) appender.append( SqlTokenTypes.SELECT_EXPR, text, false );
					if ( generatedExpr != null ) {
						generatedExpr.setFromElement( fromElement );
					}
				}
			}
		}
		// Get all the select expressions (that we just generated) and render the select.
		SelectExpression[] selectExpressions = collectSelectExpressions();
		if ( getWalker().isShallowQuery() ) {
			renderScalarSelects( selectExpressions, fromClause );
		}
		else {
			renderNonScalarSelects( selectExpressions, fromClause );
		}
		finishInitialization( /*sqlResultTypeList,*/ queryReturnTypeList );
}

Prepares a derived (i.e., not explicitly defined in the query) select clause.

 public  void initializeExplicitSelectClause(FromClause fromClause) throws SemanticException 
{
		if ( prepared ) {
			throw new IllegalStateException( "SelectClause was already prepared!" );
		}
		//explicit = true;	// This is an explict Select.
		//ArrayList sqlResultTypeList = new ArrayList();
		ArrayList queryReturnTypeList = new ArrayList();
		// First, collect all of the select expressions.
		// NOTE: This must be done *before* invoking setScalarColumnText() because setScalarColumnText()
		// changes the AST!!!
		SelectExpression[] selectExpressions = collectSelectExpressions();
		for ( int i = 0; i <  selectExpressions.length; i++ ) {
			SelectExpression expr = selectExpressions[i];
			if ( expr.isConstructor() ) {
				constructorNode = ( ConstructorNode ) expr;
				List constructorArgumentTypeList = constructorNode.getConstructorArgumentTypeList();
				//sqlResultTypeList.addAll( constructorArgumentTypeList );
				queryReturnTypeList.addAll( constructorArgumentTypeList );
				scalarSelect = true;
			}
			else {
				Type type = expr.getDataType();
				if ( type == null ) {
					throw new IllegalStateException( "No data type for node: " + expr.getClass().getName() + " "
							+ new ASTPrinter( SqlTokenTypes.class ).showAsString( ( AST ) expr, "" ) );
				}
				//sqlResultTypeList.add( type );
				// If the data type is not an association type, it could not have been in the FROM clause.
				if ( expr.isScalar() ) {
					scalarSelect = true;
				}
				if ( isReturnableEntity( expr ) ) {
					fromElementsForLoad.add( expr.getFromElement() );
				}
				// Always add the type to the return type list.
				queryReturnTypeList.add( type );
			}
		}
		//init the aliases, after initing the constructornode
		initAliases(selectExpressions);
		if ( !getWalker().isShallowQuery() ) {
			// add the fetched entities
			List fromElements = fromClause.getProjectionList();
			ASTAppender appender = new ASTAppender( getASTFactory(), this );	// Get ready to start adding nodes.
			int size = fromElements.size();
			Iterator iterator = fromElements.iterator();
			for ( int k = 0; iterator.hasNext(); k++ ) {
				FromElement fromElement = ( FromElement ) iterator.next();
				if ( fromElement.isFetch() ) {
					FromElement origin = null;
					if ( fromElement.getRealOrigin() == null ) {
						// work around that crazy issue where the tree contains
						// "empty" FromElements (no text); afaict, this is caused
						// by FromElementFactory.createCollectionJoin()
						if ( fromElement.getOrigin() == null ) {
							throw new QueryException( "Unable to determine origin of join fetch [" + fromElement.getDisplayText() + "]" );
						}
						else {
							origin = fromElement.getOrigin();
						}
					}
					else {
						origin = fromElement.getRealOrigin();
					}
					if ( !fromElementsForLoad.contains( origin ) ) {
						throw new QueryException(
								"query specified join fetching, but the owner " +
								"of the fetched association was not present in the select list " +
								"[" + fromElement.getDisplayText() + "]"
						);
					}
					Type type = fromElement.getSelectType();
					addCollectionFromElement( fromElement );
					if ( type != null ) {
						boolean collectionOfElements = fromElement.isCollectionOfValuesOrComponents();
						if ( !collectionOfElements ) {
							// Add the type to the list of returned sqlResultTypes.
							fromElement.setIncludeSubclasses( true );
							fromElementsForLoad.add( fromElement );
							//sqlResultTypeList.add( type );
							// Generate the select expression.
							String text = fromElement.renderIdentifierSelect( size, k );
							SelectExpressionImpl generatedExpr = ( SelectExpressionImpl ) appender.append( SqlTokenTypes.SELECT_EXPR, text, false );
							if ( generatedExpr != null ) {
								generatedExpr.setFromElement( fromElement );
							}
						}
					}
				}
			}
			// generate id select fragment and then property select fragment for
			// each expression, just like generateSelectFragments().
			renderNonScalarSelects( collectSelectExpressions(), fromClause );
		}
		if ( scalarSelect || getWalker().isShallowQuery() ) {
			// If there are any scalars (non-entities) selected, render the select column aliases.
			renderScalarSelects( selectExpressions, fromClause );
		}
		finishInitialization( /*sqlResultTypeList,*/ queryReturnTypeList );
}

Prepares an explicitly defined select clause.

 public boolean isDistinct() 
{
		return getFirstChild() != null && getFirstChild().getType() == SqlTokenTypes.DISTINCT;
}

 public boolean isList() 
{
		return constructorNode == null ? false : constructorNode.isList();
}

 public boolean isMap() 
{
		return constructorNode == null ? false : constructorNode.isMap();
}

 public boolean isScalarSelect() 
{
		return scalarSelect;
}

Does this SelectClause represent a scalar query