String getColumnName() {
        if (alias != null) { return alias; }

        if (selectExpression instanceof PropertyExpression) {
            return ((PropertyExpression) selectExpression).getColumnName();
        }
        if (selectExpression instanceof MetaExpression) {
            return ((MetaExpression) selectExpression).getColumnName();
        }

        return null;
    }
String getColumnName ( ) { if ( alias != null ) { return alias ; } if ( selectExpression instanceof PropertyExpression ) { return ( ( PropertyExpression ) selectExpression ) . getColumnName ( ) ; } if ( selectExpression instanceof MetaExpression ) { return ( ( MetaExpression ) selectExpression ) . getColumnName ( ) ; } return null ; }
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