protected override BoundRelation RewriteUnionRelation(BoundUnionRelation node)
{
if (node.IsUnionAll)
{
var definedValues = RemoveUnusedSlots(node.DefinedValues, d => d.ValueSlot);
node = node.Update(node.IsUnionAll, node.Inputs, definedValues, node.Comparers);
}
_recorder.Record(node.DefinedValues);
return(base.RewriteUnionRelation(node));
}
protected override BoundRelation RewriteUnionRelation(BoundUnionRelation node)
{
var inputs = RewriteRelations(node.Inputs);
var values = node.DefinedValues;
var concatenation = new BoundConcatenationRelation(inputs, values);
if (node.IsUnionAll)
{
return(concatenation);
}
var sortedValues = values.Zip(node.Comparers, (v, c) => new BoundComparedValue(v.ValueSlot, c));
return(new BoundSortRelation(true, concatenation, sortedValues));
}
private static CardinalityEstimate EstimateUnionRelation(BoundUnionRelation relation)
{
return(CardinalityEstimate.Unknown);
}
