// Indicates whether the given query expression could safely be extended with another table operator expression of the given table operator
public bool IsCompatibleWith(TableOperator tableOperator)
{
foreach (TableOperatorExpression tableOperatorExpression in _tableOperators)
{
if (tableOperatorExpression.TableOperator != tableOperator)
{
return(false);
}
}
return(true);
}
protected virtual string GetTableOperatorKeyword(TableOperator tableOperator)
{
switch (tableOperator)
{
case TableOperator.Union: return(Keywords.Union);
case TableOperator.Intersect: return(Keywords.Intersect);
case TableOperator.Difference: return(Keywords.Minus);
default: throw new LanguageException(LanguageException.Codes.UnknownInstruction, tableOperator.ToString());
}
}
public TableOperatorExpression(TableOperator operatorValue, bool distinct, SelectExpression selectExpression) : base()
{
_tableOperator = operatorValue;
_distinct = distinct;
_selectExpression = selectExpression;
}
public TableOperatorExpression(TableOperator operatorValue, SelectExpression selectExpression) : base()
{
_tableOperator = operatorValue;
_selectExpression = selectExpression;
}
