public override IQueryElement VisitWhere_operation([NotNull] QueryGrammarParser.Where_operationContext context)
{
IQueryElement leftValueTree = Visit(context.left);
if (context.where_operator().is_null() != null)
{
OperationIsNull isNullTree = new OperationIsNull();
isNullTree.Add(leftValueTree);
return(isNullTree);
}
else if (context.where_operator().is_not_null() != null)
{
OperationIsNotNull isNotNullTree = new OperationIsNotNull();
isNotNullTree.Add(leftValueTree);
return(isNotNullTree);
}
OperationComperision comperasionTree = new OperationComperision();
LeftOperand left = new LeftOperand();
left.Add(leftValueTree);
comperasionTree.Add(left);
IQueryElement operatorTree = Visit(context.where_operator().comparison_operator());
comperasionTree.Add(operatorTree);
RightOperand right = new RightOperand();
IQueryElement rightValueTree = Visit(context.right);
right.Add(rightValueTree);
comperasionTree.Add(right);
return(comperasionTree);
}