private OrderByContext CreateOrderByContextForDistinctRowWithoutGroupBy(SelectCommand selectCommand, GroupByContext groupByContext)
{
if (!groupByContext.GetItems().Any() && selectCommand.Projections.IsDistinctRow())
{
int index = 0;
ICollection <OrderByItem> orderByItems = new LinkedList <OrderByItem>();
foreach (var projectionSegment in selectCommand.Projections.GetProjections())
{
if (projectionSegment is ColumnProjectionSegment columnProjectionSegment)
{
var columnOrderByItemSegment = new ColumnOrderByItemSegment(columnProjectionSegment.GetColumn(), OrderDirectionEnum.ASC);
OrderByItem item = new OrderByItem(columnOrderByItemSegment);
item.SetIndex(index);
orderByItems.Add(item);
index++;
}
}
if (orderByItems.Any())
{
return(new OrderByContext(orderByItems, true));
}
}
return(null);
}
private bool IsSameProjection(ShorthandProjection shorthandProjection, ColumnOrderByItemSegment orderItem, SelectCommand selectCommand)
{
if (shorthandProjection.GetOwner() == null)
{
throw new ShardingException("shorthandProjection can not found owner");
}
SimpleTableSegment tableSegment = Find(shorthandProjection.GetOwner(), selectCommand);
return(_schemaMetaData.ContainsColumn(tableSegment.GetTableName().GetIdentifier().GetValue(), orderItem.GetColumn().GetIdentifier().GetValue()));
}
