public IEnumerable <ShowPlan> GetShowPlanSteps()
{
var bindingResult = Binder.Bind(SyntaxTree.Root, DataContext);
if (GetDiagnostics(bindingResult).Any())
{
yield break;
}
var inputQuery = GetBoundQuery(bindingResult.BoundRoot);
yield return(ShowPlanBuilder.Build(Resources.ShowPlanUnoptimized, inputQuery));
var relation = inputQuery.Relation;
foreach (var rewriter in Optimizer.GetOptimizationSteps())
{
var step = rewriter.RewriteRelation(relation);
if (step != relation)
{
var stepName = string.Format(Resources.ShowPlanStepFmt, rewriter.GetType().Name);
var stepQuery = new BoundQuery(step, inputQuery.OutputColumns);
yield return(ShowPlanBuilder.Build(stepName, stepQuery));
}
relation = step;
}
var ouputQuery = new BoundQuery(relation, inputQuery.OutputColumns);
yield return(ShowPlanBuilder.Build(Resources.ShowPlanOptimized, ouputQuery));
}
internal static ShowPlan Build(AlgebraNode root)
{
ShowPlanElement rootElement = ShowPlanBuilder.Convert(root);
return(new ShowPlan(rootElement));
}
