internal static bool Process(PlanCompiler compilerState)
{
JoinElimination je = new JoinElimination(compilerState);
je.Process();
return(je.m_treeModified);
}
internal static bool Process(PlanCompiler compilerState)
{
JoinElimination je = new JoinElimination(compilerState);
je.Process();
return je.m_treeModified;
}
/// <summary>
/// The real driver.
/// </summary>
/// <param name="providerCommands">list of provider commands</param>
/// <param name="resultColumnMap">column map for the result</param>
/// <param name="entitySets">the entity sets exposed in this query</param>
private void Compile(out List <ProviderCommandInfo> providerCommands, out ColumnMap resultColumnMap, out int columnCount, out Common.Utils.Set <md.EntitySet> entitySets)
{
Initialize(); // initialize the ITree
string beforePreProcessor = String.Empty;
string beforeAggregatePushdown = String.Empty;
string beforeNormalization = String.Empty;
string beforeNTE = String.Empty;
string beforeProjectionPruning1 = String.Empty;
string beforeNestPullup = String.Empty;
string beforeProjectionPruning2 = String.Empty;
string beforeTransformationRules1 = String.Empty;
string beforeProjectionPruning3 = String.Empty;
string beforeTransformationRules2 = String.Empty;
string beforeJoinElimination1 = String.Empty;
string beforeTransformationRules3 = String.Empty;
string beforeJoinElimination2 = String.Empty;
string beforeTransformationRules4 = String.Empty;
string beforeCodeGen = String.Empty;
//
// We always need the pre-processor and the codegen phases.
// It is generally a good thing to run through the transformation rules, and
// the projection pruning phases.
// The "optional" phases are AggregatePushdown, Normalization, NTE, NestPullup and JoinElimination
//
m_neededPhases = (1 << (int)PlanCompilerPhase.PreProcessor) |
// (1 << (int)PlanCompilerPhase.AggregatePushdown) |
// (1 << (int)PlanCompilerPhase.Normalization) |
// (1 << (int)PlanCompilerPhase.NTE) |
(1 << (int)PlanCompilerPhase.ProjectionPruning) |
// (1 << (int)PlanCompilerPhase.NestPullup) |
(1 << (int)PlanCompilerPhase.Transformations) |
// (1 << (int)PlanCompilerPhase.JoinElimination) |
(1 << (int)PlanCompilerPhase.CodeGen);
// Perform any necessary preprocessing
StructuredTypeInfo typeInfo;
Dictionary <md.EdmFunction, md.EdmProperty[]> tvfResultKeys;
beforePreProcessor = SwitchToPhase(PlanCompilerPhase.PreProcessor);
PreProcessor.Process(this, out typeInfo, out tvfResultKeys);
entitySets = typeInfo.GetEntitySets();
if (IsPhaseNeeded(PlanCompilerPhase.AggregatePushdown))
{
beforeAggregatePushdown = SwitchToPhase(PlanCompilerPhase.AggregatePushdown);
AggregatePushdown.Process(this);
}
if (IsPhaseNeeded(PlanCompilerPhase.Normalization))
{
beforeNormalization = SwitchToPhase(PlanCompilerPhase.Normalization);
Normalizer.Process(this);
}
// Eliminate "structured" types.
if (IsPhaseNeeded(PlanCompilerPhase.NTE))
{
beforeNTE = SwitchToPhase(PlanCompilerPhase.NTE);
NominalTypeEliminator.Process(this, typeInfo, tvfResultKeys);
}
// Projection pruning - eliminate unreferenced expressions
if (IsPhaseNeeded(PlanCompilerPhase.ProjectionPruning))
{
beforeProjectionPruning1 = SwitchToPhase(PlanCompilerPhase.ProjectionPruning);
ProjectionPruner.Process(this);
}
// Nest Pull-up on the ITree
if (IsPhaseNeeded(PlanCompilerPhase.NestPullup))
{
beforeNestPullup = SwitchToPhase(PlanCompilerPhase.NestPullup);
NestPullup.Process(this);
//If we do Nest Pull-up, we should again do projection pruning
beforeProjectionPruning2 = SwitchToPhase(PlanCompilerPhase.ProjectionPruning);
ProjectionPruner.Process(this);
}
// Run transformations on the tree
if (IsPhaseNeeded(PlanCompilerPhase.Transformations))
{
bool projectionPrunningNeeded = ApplyTransformations(ref beforeTransformationRules1, TransformationRulesGroup.All);
if (projectionPrunningNeeded)
{
beforeProjectionPruning3 = SwitchToPhase(PlanCompilerPhase.ProjectionPruning);
ProjectionPruner.Process(this);
ApplyTransformations(ref beforeTransformationRules2, TransformationRulesGroup.Project);
}
}
// Join elimination
if (IsPhaseNeeded(PlanCompilerPhase.JoinElimination))
{
beforeJoinElimination1 = SwitchToPhase(PlanCompilerPhase.JoinElimination);
bool modified = JoinElimination.Process(this);
if (modified)
{
ApplyTransformations(ref beforeTransformationRules3, TransformationRulesGroup.PostJoinElimination);
beforeJoinElimination2 = SwitchToPhase(PlanCompilerPhase.JoinElimination);
modified = JoinElimination.Process(this);
if (modified)
{
ApplyTransformations(ref beforeTransformationRules4, TransformationRulesGroup.PostJoinElimination);
}
}
}
// Code generation
beforeCodeGen = SwitchToPhase(PlanCompilerPhase.CodeGen);
CodeGen.Process(this, out providerCommands, out resultColumnMap, out columnCount);
#if DEBUG
// GC.KeepAlive makes FxCop Grumpy.
int size = beforePreProcessor.Length;
size = beforeAggregatePushdown.Length;
size = beforeNormalization.Length;
size = beforeNTE.Length;
size = beforeProjectionPruning1.Length;
size = beforeNestPullup.Length;
size = beforeProjectionPruning2.Length;
size = beforeTransformationRules1.Length;
size = beforeProjectionPruning3.Length;
size = beforeTransformationRules2.Length;
size = beforeJoinElimination1.Length;
size = beforeTransformationRules3.Length;
size = beforeJoinElimination2.Length;
size = beforeTransformationRules4.Length;
size = beforeCodeGen.Length;
#endif
// All done
return;
}
