public override IASTNode VisitProjection(SqlServerCommandParser.ProjectionContext context)
{
// FIXME :The stop index of project is the stop index of projection, instead of alias.
if (null != context.qualifiedShorthand())
{
var shorthand = context.qualifiedShorthand();
var result = new ShorthandProjectionSegment(shorthand.Start.StartIndex, shorthand.Stop.StopIndex);
IdentifierValue identifier = new IdentifierValue(shorthand.identifier().GetText());
result.SetOwner(new OwnerSegment(shorthand.identifier().Start.StartIndex, shorthand.identifier().Stop.StopIndex, identifier));
return(result);
}
AliasSegment alias = null == context.alias() ? null : (AliasSegment)Visit(context.alias());
if (null != context.columnName())
{
ColumnSegment column = (ColumnSegment)Visit(context.columnName());
ColumnProjectionSegment result = new ColumnProjectionSegment(column);
result.SetAlias(alias);
return(result);
}
return(CreateProjection(context, alias));
}
private ColumnProjection CreateProjection(ColumnProjectionSegment projectionSegment)
{
String owner = projectionSegment.GetColumn().GetOwner()?.GetIdentifier().GetValue();
return(new ColumnProjection(owner, projectionSegment.GetColumn().GetIdentifier().GetValue(), projectionSegment.GetAlias()));
}
