private BoundRelation PushOverTop(BoundFilterRelation node, BoundTopRelation input)
{
var newFilter = RewriteRelation(node.Update(input.Input, node.Condition));
var newInput = input.Update(newFilter, input.Limit, input.TieEntries);
return(newInput);
}
private static CardinalityEstimate EstimateTopRelation(BoundTopRelation relation)
{
var input = Estimate(relation.Input);
return(relation.TieEntries.Any()
? input
: new CardinalityEstimate(input.Minimum, relation.Limit));
}
private Iterator BuildTopWithTies(BoundTopRelation relation)
{
var input = BuildRelation(relation.Input);
var rowBufferAllocation = BuildRowBufferAllocation(relation.Input, input.RowBuffer);
var tieEntries = relation.TieEntries.Select(t => rowBufferAllocation[t.ValueSlot]).ToImmutableArray();
var tieComparers = relation.TieEntries.Select(t => t.Comparer).ToImmutableArray();
return(new TopWithTiesIterator(input, relation.Limit, tieEntries, tieComparers));
}
protected override BoundRelation RewriteTopRelation(BoundTopRelation node)
{
_recorder.Record(node.TieEntries);
return(base.RewriteTopRelation(node));
}
private static ShowPlanNode BuildTop(BoundTopRelation node)
{
var tieEntries = string.Join(@", ", node.TieEntries.Select(v => v.ValueSlot.Name));
var operatorName = $"Top {node.Limit}{(!node.TieEntries.Any() ? string.Empty : $" With Ties ({tieEntries})")}";
private Iterator BuildTopWithoutTies(BoundTopRelation relation)
{
var input = BuildRelation(relation.Input);
return(new TopIterator(input, relation.Limit));
}
private Iterator BuildTop(BoundTopRelation relation)
{
return(relation.TieEntries.Any()
? BuildTopWithTies(relation)
: BuildTopWithoutTies(relation));
}