internal static TypeUsage ValidateFilter(
DbExpressionBinding input,
DbExpression predicate)
{
ArgumentValidation.RequireCompatibleType(predicate, PrimitiveTypeKind.Boolean, nameof(predicate));
return(input.Expression.ResultType);
}
public static DbExpression Convert(DynamicFilterDefinition filter, DbExpressionBinding binding, DbContext dbContext, DataSpace dataSpace)
{
var visitor = new LambdaToDbExpressionVisitor(filter, binding, dbContext, dataSpace);
var expression = visitor.Visit(filter.Predicate) as LambdaExpression;
var dbExpression = visitor.GetDbExpressionForExpression(expression.Body);
if (dbExpression is DbPropertyExpression)
{
// Special case to handle a condition that is just a plain "boolFlag" or a nullable generic condition.
// For a nullable type, we only get here when the filter has either not specified a value for the nullable
// parameter or it has specified "null" - both evaluate the same as far as the method prototypes can tell
// since the method signature is "param = null". This needs to generate a sql "is null" condition.
// Otherwise, no param value was specified so we are assuming that we need to generate a "positive"
// condition. i.e. the filter just said "b.prop" which generally means "b.prop == true".
// To generate that condition correctly for all types (may not necessarily be a bool), we create a condition
// like "!(b.prop == [defaultValue])"
if (IsNullableType(expression.Body.Type))
{
dbExpression = DbExpressionBuilder.IsNull(dbExpression);
}
else
{
var defaultValue = DbExpressionBuilder.Constant(dbExpression.ResultType, Activator.CreateInstance(expression.Body.Type));
dbExpression = DbExpressionBuilder.Not(DbExpressionBuilder.Equal(dbExpression, defaultValue));
}
}
return(dbExpression);
}
/// <summary>
/// This method is called by <see cref="Visit(DbFilterExpression)"/> and
/// <see cref="Visit(DbQuantifierExpression)"/>
///
/// </summary>
/// <param name="input"></param>
/// <param name="predicate"></param>
/// <param name="negatePredicate">This is passed from <see cref="Visit(DbQuantifierExpression)"/>
/// in the All(...) case.</param>
/// <returns></returns>
private SqlSelectStatement VisitFilterExpression(DbExpressionBinding input, DbExpression predicate, bool negatePredicate)
{
Symbol fromSymbol;
var result = VisitInputExpression(input.Expression, input.VariableName, input.VariableType, out fromSymbol);
// Filter is compatible with OrderBy
// but not with Project, another Filter or GroupBy
if (!IsCompatible(result, DbExpressionKind.Filter))
{
result = CreateNewSelectStatement(result, input.VariableName, input.VariableType, out fromSymbol);
}
selectStatementStack.Push(result);
symbolTable.EnterScope();
AddFromSymbol(result, input.VariableName, fromSymbol);
if (negatePredicate)
{
result.Where.Append("NOT (");
}
result.Where.Append(predicate.Accept(this));
if (negatePredicate)
{
result.Where.Append(")");
}
symbolTable.ExitScope();
selectStatementStack.Pop();
return(result);
}
/// <summary>
/// Builds insert command.
/// </summary>
/// <param name="newRow">Row to insert.</param>
/// <param name="processor">Context for the table we're inserting into.</param>
/// <returns>Insert command.</returns>
internal UpdateCommand BuildInsertCommand(PropagatorResult newRow, TableChangeProcessor processor)
{
// Bind the insert target
DbExpressionBinding target = GetTarget(processor);
// Create set clauses and returning parameter
Dictionary <int, string> outputIdentifiers;
DbExpression returning;
bool rowMustBeTouched = true; // for inserts, the row must always be touched
List <DbModificationClause> setClauses = new List <DbModificationClause>();
foreach (DbModificationClause clause in BuildSetClauses(target, newRow, null, processor, /* insertMode */ true, out outputIdentifiers,
out returning, ref rowMustBeTouched))
{
setClauses.Add(clause);
}
// Initialize DML command tree
DbInsertCommandTree commandTree =
new DbInsertCommandTree(m_translator.MetadataWorkspace, DataSpace.SSpace, target, setClauses.AsReadOnly(), returning);
// Create command
UpdateCommand command = new DynamicUpdateCommand(processor, m_translator, ModificationOperator.Insert, null, newRow, commandTree, outputIdentifiers);
return(command);
}
private DbExpression BuildPredicate(
DbExpressionBinding target,
PropagatorResult referenceRow,
PropagatorResult current,
TableChangeProcessor processor,
ref bool rowMustBeTouched)
{
Dictionary <EdmProperty, PropagatorResult> dictionary = new Dictionary <EdmProperty, PropagatorResult>();
int ordinal = 0;
foreach (EdmProperty property in processor.Table.ElementType.Properties)
{
PropagatorResult memberValue = referenceRow.GetMemberValue(ordinal);
PropagatorResult input = current == null ? (PropagatorResult)null : current.GetMemberValue(ordinal);
if (!rowMustBeTouched && (UpdateCompiler.HasFlag(memberValue, PropagatorFlags.ConcurrencyValue) || UpdateCompiler.HasFlag(input, PropagatorFlags.ConcurrencyValue)))
{
rowMustBeTouched = true;
}
if (!dictionary.ContainsKey(property) && (UpdateCompiler.HasFlag(memberValue, PropagatorFlags.ConcurrencyValue | PropagatorFlags.Key) || UpdateCompiler.HasFlag(input, PropagatorFlags.ConcurrencyValue | PropagatorFlags.Key)))
{
dictionary.Add(property, memberValue);
}
++ordinal;
}
DbExpression left = (DbExpression)null;
foreach (KeyValuePair <EdmProperty, PropagatorResult> keyValuePair in dictionary)
{
DbExpression equalityExpression = this.GenerateEqualityExpression(target, keyValuePair.Key, keyValuePair.Value);
left = left != null ? (DbExpression)left.And(equalityExpression) : equalityExpression;
}
return(left);
}
private SqlFragment HandleJoinExpression(DbExpressionBinding left, DbExpressionBinding right,
DbExpressionKind joinType, DbExpression joinCondition)
{
JoinFragment join = new JoinFragment();
join.JoinType = Metadata.GetOperator(joinType);
join.Left = VisitInputExpression(left.Expression, left.VariableName, left.VariableType);
join.Left = WrapJoinInputIfNecessary(join.Left, false);
join.Right = VisitInputExpression(right.Expression, right.VariableName, right.VariableType);
join.Right = WrapJoinInputIfNecessary(join.Right, true);
if (join.Right is SelectStatement)
{
SelectStatement select = join.Right as SelectStatement;
if (select.IsWrapped)
{
select.Name = right.VariableName;
}
}
// now handle the ON case
if (joinCondition != null)
{
join.Condition = joinCondition.Accept(this);
}
return(join);
}
public static DbExpression Convert(DynamicFilterDefinition filter, DbExpressionBinding binding, ObjectContext objectContext)
{
var visitor = new LambdaToDbExpressionVisitor(filter, binding, objectContext);
var expression = visitor.Visit(filter.Predicate) as LambdaExpression;
return(visitor.GetDbExpressionForExpression(expression.Body));
}
// Effects: given a property, produces a property expression
// Requires: all arguments are set
private static DbExpression GeneratePropertyExpression(DbExpressionBinding target, EdmProperty property)
{
DebugCheck.NotNull(target);
DebugCheck.NotNull(property);
return(target.Variable.Property(property));
}
internal static ReadOnlyCollection <DbExpressionBinding> ValidateCrossJoin(
IEnumerable <DbExpressionBinding> inputs,
out TypeUsage resultType)
{
List <DbExpressionBinding> expressionBindingList = new List <DbExpressionBinding>();
List <KeyValuePair <string, TypeUsage> > columns = new List <KeyValuePair <string, TypeUsage> >();
Dictionary <string, int> dictionary = new Dictionary <string, int>();
IEnumerator <DbExpressionBinding> enumerator = inputs.GetEnumerator();
int index = 0;
while (enumerator.MoveNext())
{
DbExpressionBinding current = enumerator.Current;
string paramName = StringUtil.FormatIndex(nameof(inputs), index);
if (current == null)
{
throw new ArgumentNullException(paramName);
}
int num = -1;
if (dictionary.TryGetValue(current.VariableName, out num))
{
throw new ArgumentException(Strings.Cqt_CrossJoin_DuplicateVariableNames((object)num, (object)index, (object)current.VariableName));
}
expressionBindingList.Add(current);
dictionary.Add(current.VariableName, index);
columns.Add(new KeyValuePair <string, TypeUsage>(current.VariableName, current.VariableType));
++index;
}
if (expressionBindingList.Count < 2)
{
throw new ArgumentException(Strings.Cqt_CrossJoin_AtLeastTwoInputs, nameof(inputs));
}
resultType = ArgumentValidation.CreateCollectionOfRowResultType(columns);
return(new ReadOnlyCollection <DbExpressionBinding>((IList <DbExpressionBinding>)expressionBindingList));
}
internal ProjectionCollapser(
Dictionary <string, DbExpression> varRefMemberBindings,
DbExpressionBinding outerBinding)
{
m_varRefMemberBindings = varRefMemberBindings;
m_outerBinding = outerBinding;
}
/// <summary>
/// Dumps a DbExpressionBinding including its VariableName and DbExpression
/// </summary>
/// <param name="binding"> The DbExpressionBinding to dump </param>
internal void Dump(DbExpressionBinding binding)
{
Begin("DbExpressionBinding", "VariableName", binding.VariableName);
Begin("Expression");
Dump(binding.Expression);
End("Expression");
End("DbExpressionBinding");
}
internal void Dump(DbExpressionBinding binding)
{
this.Begin("DbExpressionBinding", "VariableName", (object)binding.VariableName);
this.Begin("Expression");
this.Dump(binding.Expression);
this.End("Expression");
this.End("DbExpressionBinding");
}
private DbExpressionEntitySetInfo VisitExpressionBinding(DbExpressionBinding binding)
{
if (binding != null)
{
return(VisitExpression(binding.Expression));
}
return(null);
}
private void VisitBinding(DbExpressionBinding binding)
{
_key.Append("BV");
VisitVariableName(binding.VariableName);
_key.Append("=(");
binding.Expression.Accept(this);
_key.Append(')');
}
private LambdaToDbExpressionVisitor(DynamicFilterDefinition filter, DbExpressionBinding binding, DbContext dbContext, DataSpace dataSpace)
{
_Filter = filter;
_Binding = binding;
_DbContext = dbContext;
_ObjectContext = ((IObjectContextAdapter)dbContext).ObjectContext;
_DataSpace = dataSpace;
}
private void VisitBinding(DbExpressionBinding binding)
{
this._key.Append("BV");
this.VisitVariableName(binding.VariableName);
this._key.Append("=(");
binding.Expression.Accept((DbExpressionVisitor)this);
this._key.Append(')');
}
/// <summary>
/// Dumps a DbExpressionBinding including its VariableName and DbExpression
/// </summary>
/// <param name="binding"> The DbExpressionBinding to dump </param>
internal void Dump(DbExpressionBinding binding)
{
Begin("DbExpressionBinding", "VariableName", binding.VariableName);
Begin("Expression");
Dump(binding.Expression);
End("Expression");
End("DbExpressionBinding");
}
internal DbExpression ParseLambda(DbExpressionBinding input, LambdaExpression lamda)
{
bindContext.Push(lamda.Parameters[0], input.Parameter);
var dbExpression = Parse(lamda.Body);
bindContext.Pop();
return(dbExpression);
}
protected virtual void VisitExpressionBindingPre(DbExpressionBinding binding)
{
if (binding == null)
{
throw new ArgumentException("binding");
}
VisitExpression(binding.Expression);
}
private ViewValidator.DbExpressionEntitySetInfo VisitExpressionBinding(
DbExpressionBinding binding)
{
if (binding != null)
{
return(this.VisitExpression(binding.Expression));
}
return((ViewValidator.DbExpressionEntitySetInfo)null);
}
/// <summary>
/// Determines predicate used to identify a row in a table.
/// </summary>
/// <remarks>
/// Columns are included in the list when:
/// <list>
/// <item>They are keys for the table</item>
/// <item>They are concurrency values</item>
/// </list>
/// </remarks>
/// <param name="target"> Expression binding representing the table containing the row </param>
/// <param name="referenceRow"> Values for the row being located. </param>
/// <param name="current"> Values being updated (may be null). </param>
/// <param name="processor"> Context for the table containing the row. </param>
/// <param name="rowMustBeTouched"> Output parameter indicating whether a row must be touched (whether it's being modified or not) because it contains a concurrency value </param>
/// <returns> Column/value pairs. </returns>
private DbExpression BuildPredicate(
DbExpressionBinding target, PropagatorResult referenceRow, PropagatorResult current,
TableChangeProcessor processor, ref bool rowMustBeTouched)
{
var whereClauses = new Dictionary <EdmProperty, PropagatorResult>();
// add all concurrency tokens (note that keys are always concurrency tokens as well)
var propertyOrdinal = 0;
foreach (var member in processor.Table.ElementType.Properties)
{
// members and result values are ordinally aligned
var expectedValue = referenceRow.GetMemberValue(propertyOrdinal);
var newValue = null == current ? null : current.GetMemberValue(propertyOrdinal);
// check if the rowMustBeTouched value should be set to true (if it isn't already
// true and we've come across a concurrency value)
if (!rowMustBeTouched
&&
(HasFlag(expectedValue, PropagatorFlags.ConcurrencyValue) ||
HasFlag(newValue, PropagatorFlags.ConcurrencyValue)))
{
rowMustBeTouched = true;
}
// determine if this is a concurrency value
if (!whereClauses.ContainsKey(member)
&& // don't add to the set clause twice
(HasFlag(expectedValue, PropagatorFlags.ConcurrencyValue | PropagatorFlags.Key) ||
HasFlag(newValue, PropagatorFlags.ConcurrencyValue | PropagatorFlags.Key))) // tagged as concurrency value
{
whereClauses.Add(member, expectedValue);
}
propertyOrdinal++;
}
// Build a binary AND expression tree from the clauses
DbExpression predicate = null;
foreach (var clause in whereClauses)
{
var clauseExpression = GenerateEqualityExpression(target, clause.Key, clause.Value);
if (null == predicate)
{
predicate = clauseExpression;
}
else
{
predicate = predicate.And(clauseExpression);
}
}
Debug.Assert(null != predicate, "some predicate term must exist");
return(predicate);
}
private DbExpression RewriteCollection(DbExpression expression)
{
DbExpression dbExpression = expression;
DbProjectExpression projectExpression = (DbProjectExpression)null;
if (DbExpressionKind.Project == expression.ExpressionKind)
{
projectExpression = (DbProjectExpression)expression;
dbExpression = projectExpression.Input.Expression;
}
ObjectSpanRewriter.NavigationInfo navInfo = (ObjectSpanRewriter.NavigationInfo)null;
if (this.RelationshipSpan)
{
dbExpression = ObjectSpanRewriter.RelationshipNavigationVisitor.FindNavigationExpression(dbExpression, this._aliasGenerator, out navInfo);
}
if (navInfo != null)
{
this.EnterNavigationCollection(navInfo);
}
else
{
this.EnterCollection();
}
DbExpression body = expression;
if (projectExpression != null)
{
DbExpression projection = this.Rewrite(projectExpression.Projection);
if (!object.ReferenceEquals((object)projectExpression.Projection, (object)projection))
{
body = (DbExpression)dbExpression.BindAs(projectExpression.Input.VariableName).Project(projection);
}
}
else
{
DbExpressionBinding input = dbExpression.BindAs(this._aliasGenerator.Next());
DbExpression variable = (DbExpression)input.Variable;
DbExpression projection = this.Rewrite(variable);
if (!object.ReferenceEquals((object)variable, (object)projection))
{
body = (DbExpression)input.Project(projection);
}
}
this.ExitCollection();
if (navInfo != null && navInfo.InUse)
{
body = (DbExpression)DbExpressionBuilder.Lambda(body, (IEnumerable <DbVariableReferenceExpression>) new List <DbVariableReferenceExpression>(1)
{
navInfo.SourceVariable
}).Invoke((IEnumerable <DbExpression>) new List <DbExpression>(1)
{
navInfo.Source
});
}
return(body);
}
private void Write(string name, DbExpressionBinding binding)
{
// WriteLine(binding.GetType().Name);
WriteLine(string.Format("{0} ({1}): {2}", name, binding.GetType().Name, binding.VariableType));
_depth++;
Write("VariableName", binding.VariableName);
Write("Expression", binding.Expression);
Write("Variable", binding.Variable);
_depth--;
}
private DbExpressionEntitySetInfo VisitExpressionBinding(DbExpressionBinding binding)
{
DbExpressionBinding result = binding;
if (binding != null)
{
return(this.VisitExpression(binding.Expression));
}
return(null);
}
/// <summary>
/// Builds an update command.
/// </summary>
/// <param name="oldRow">Old value of the row being updated.</param>
/// <param name="newRow">New value for the row being updated.</param>
/// <param name="processor">Context for the table containing row.</param>
/// <returns>Update command.</returns>
internal UpdateCommand BuildUpdateCommand(PropagatorResult oldRow,
PropagatorResult newRow, TableChangeProcessor processor)
{
// If we're updating a row, the row may not need to be touched (e.g., no concurrency validation required)
bool rowMustBeTouched = false;
DbExpressionBinding target = GetTarget(processor);
// Create set clauses and returning parameter
Dictionary <int, string> outputIdentifiers;
DbExpression returning;
List <DbModificationClause> setClauses = new List <DbModificationClause>();
foreach (DbModificationClause clause in BuildSetClauses(
target, newRow, oldRow, processor, /* insertMode */ false, out outputIdentifiers, out returning,
ref rowMustBeTouched))
{
setClauses.Add(clause);
}
// Construct predicate identifying the row to modify
DbExpression predicate = BuildPredicate(target, oldRow, newRow, processor, ref rowMustBeTouched);
if (0 == setClauses.Count)
{
if (rowMustBeTouched)
{
List <IEntityStateEntry> stateEntries = new List <IEntityStateEntry>();
stateEntries.AddRange(SourceInterpreter.GetAllStateEntries(
oldRow, m_translator, processor.Table));
stateEntries.AddRange(SourceInterpreter.GetAllStateEntries(
newRow, m_translator, processor.Table));
if (stateEntries.All(it => (it.State == EntityState.Unchanged)))
{
rowMustBeTouched = false;
}
}
// Determine if there is nothing to do (i.e., no values to set,
// no computed columns, and no concurrency validation required)
if (!rowMustBeTouched)
{
return(null);
}
}
// Initialize DML command tree
DbUpdateCommandTree commandTree =
new DbUpdateCommandTree(m_translator.MetadataWorkspace, DataSpace.SSpace, target, predicate, setClauses.AsReadOnly(), returning);
// Create command
UpdateCommand command = new DynamicUpdateCommand(processor, m_translator, ModificationOperator.Update, oldRow, newRow, commandTree, outputIdentifiers);
return(command);
}
internal virtual DbExpression OfType(TypeUsage type)
{
// s.OfType<T> is normally translated to s.Filter(e => e is T).Project(e => e as T)
DbExpressionBinding rootBinding = _root.BindAs(_aliasGenerator.Next());
DbExpression filter = this.Filter(rootBinding.Filter(rootBinding.Variable.IsOf(type)));
OrderByLifterBase filterLifter = GetLifter(filter, _aliasGenerator);
DbExpressionBinding filterBinding = filter.BindAs(_aliasGenerator.Next());
DbExpression project = filterLifter.Project(filterBinding.Project(filterBinding.Variable.TreatAs(type)));
return(project);
}
internal UpdateCommand BuildDeleteCommand(
PropagatorResult oldRow,
TableChangeProcessor processor)
{
bool rowMustBeTouched = true;
DbExpressionBinding target = UpdateCompiler.GetTarget(processor);
DbExpression predicate = this.BuildPredicate(target, oldRow, (PropagatorResult)null, processor, ref rowMustBeTouched);
DbDeleteCommandTree deleteCommandTree = new DbDeleteCommandTree(this.m_translator.MetadataWorkspace, DataSpace.SSpace, target, predicate);
return((UpdateCommand) new DynamicUpdateCommand(processor, this.m_translator, ModificationOperator.Delete, oldRow, (PropagatorResult)null, (DbModificationCommandTree)deleteCommandTree, (Dictionary <int, string>)null));
}
public override SqlFragment Visit(DbApplyExpression expression)
{
DbExpressionBinding inputBinding = expression.Input;
InputFragment input = VisitInputExpression(inputBinding.Expression, inputBinding.VariableName, inputBinding.VariableType);
DbExpressionBinding applyBinding = expression.Apply;
InputFragment apply = VisitInputExpression(applyBinding.Expression, applyBinding.VariableName, applyBinding.VariableType);
SelectStatement select = new SelectStatement();
bool isInputSelect = false;
if (!(input is TableFragment))
{
input.Wrap(scope);
isInputSelect = true;
}
apply.Wrap(scope);
select.From = input;
select.Wrap(scope);
if (apply is SelectStatement)
{
SelectStatement applySel = apply as SelectStatement;
foreach (ColumnFragment f in applySel.Columns)
{
SelectStatement newColSelect = new SelectStatement();
newColSelect.From = applySel.From;
newColSelect.Where = applySel.Where;
if (isInputSelect)
{
VisitAndReplaceTableName(newColSelect.Where, (input as SelectStatement).From.Name, input.Name);
}
newColSelect.Limit = applySel.Limit;
newColSelect.Columns.Add(f);
newColSelect.Wrap(scope);
scope.Add(applySel.From.Name, applySel.From);
ColumnFragment newCol = new ColumnFragment(apply.Name, f.ColumnName);
newCol.Literal = newColSelect;
newCol.PushInput(newCol.ColumnName);
newCol.PushInput(apply.Name);
select.AddColumn(newCol, scope);
if (string.IsNullOrEmpty(newCol.ColumnAlias))
{
newColSelect.Name = newCol.ColumnName;
newCol.ColumnAlias = newCol.ColumnName;
}
scope.Remove(newColSelect);
}
scope.Remove(applySel.From);
scope.Remove(apply);
}
return(select);
}
// Effects: given a "clause" in the form of a property/value pair, produces an equality expression. If the
// value is null, creates an IsNull expression
// Requires: all arguments are set
private DbExpression GenerateEqualityExpression(DbExpressionBinding target, EdmProperty property, PropagatorResult value)
{
Debug.Assert(null != target && null != property && null != value);
DbExpression propertyExpression = GeneratePropertyExpression(target, property);
DbExpression valueExpression = GenerateValueExpression(property, value);
if (valueExpression.ExpressionKind == DbExpressionKind.Null)
{
return(propertyExpression.IsNull());
}
return(propertyExpression.Equal(valueExpression));
}
private DbExpression GenerateEqualityExpression(
DbExpressionBinding target,
EdmProperty property,
PropagatorResult value)
{
DbExpression propertyExpression = UpdateCompiler.GeneratePropertyExpression(target, property);
DbExpression valueExpression = this.GenerateValueExpression(property, value);
if (valueExpression.ExpressionKind == DbExpressionKind.Null)
{
return((DbExpression)propertyExpression.IsNull());
}
return((DbExpression)propertyExpression.Equal(valueExpression));
}
internal static TypeUsage ValidateApply(
DbExpressionBinding input,
DbExpressionBinding apply)
{
if (input.VariableName.Equals(apply.VariableName, StringComparison.Ordinal))
{
throw new ArgumentException(Strings.Cqt_Apply_DuplicateVariableNames);
}
return(ArgumentValidation.CreateCollectionOfRowResultType(new List <KeyValuePair <string, TypeUsage> >()
{
new KeyValuePair <string, TypeUsage>(input.VariableName, input.VariableType),
new KeyValuePair <string, TypeUsage>(apply.VariableName, apply.VariableType)
}));
}
/// <summary>
/// Dumps a DbExpressionBinding with the specified decoration
/// </summary>
/// <param name="binding"> The DbExpressionBinding to dump </param>
/// <param name="name"> The decorating block name </param>
internal void Dump(DbExpressionBinding binding, string name)
{
Begin(name);
Dump(binding);
End(name);
}
protected virtual void VisitExpressionBindingPost(DbExpressionBinding binding)
{
}
protected virtual void VisitExpressionBindingPre(DbExpressionBinding binding)
{
if (binding == null) throw new ArgumentException("binding");
VisitExpression(binding.Expression);
}
private SqlFragment HandleJoinExpression(DbExpressionBinding left, DbExpressionBinding right,
DbExpressionKind joinType, DbExpression joinCondition)
{
JoinFragment join = new JoinFragment();
join.JoinType = Metadata.GetOperator(joinType);
join.Left = VisitInputExpression(left.Expression, left.VariableName, left.VariableType);
join.Left = WrapJoinInputIfNecessary(join.Left, false);
join.Right = VisitInputExpression(right.Expression, right.VariableName, right.VariableType);
join.Right = WrapJoinInputIfNecessary(join.Right, true);
if (join.Right is SelectStatement)
{
SelectStatement select = join.Right as SelectStatement;
if (select.IsWrapped)
select.Name = right.VariableName;
}
// now handle the ON case
if (joinCondition != null)
join.Condition = joinCondition.Accept(this);
return join;
}
internal ProjectionCollapser(
Dictionary<string, DbExpression> varRefMemberBindings,
DbExpressionBinding outerBinding)
{
m_varRefMemberBindings = varRefMemberBindings;
m_outerBinding = outerBinding;
}
private void VisitBinding(DbExpressionBinding binding)
{
_key.Append("BV");
VisitVariableName(binding.VariableName);
_key.Append("=(");
binding.Expression.Accept(this);
_key.Append(')');
}