// <summary>
// Given the results returned for the left and right inputs to a union, propagates changes
// through the union.
// Propagation rule (U = union node, L = left input, R = right input, D(x) = deleted rows
// in x, I(x) = inserted rows in x)
// U = L union R
// D(U) = D(L) union D(R)
// I(U) = I(L) union I(R)
// </summary>
// <param name="node"> Union expression node in the update mapping view. </param>
// <returns> Result of propagating changes to this union all node. </returns>
public override ChangeNode Visit(DbUnionAllExpression node)
{
Check.NotNull(node, "node");
// Initialize an empty change node result for the union all node
var result = BuildChangeNode(node);
// Retrieve result of propagating changes to the left and right children.
var left = Visit(node.Left);
var right = Visit(node.Right);
// Implement insertion propagation rule I(U) = I(L) union I(R)
result.Inserted.AddRange(left.Inserted);
result.Inserted.AddRange(right.Inserted);
// Implement deletion progation rule D(U) = D(L) union D(R)
result.Deleted.AddRange(left.Deleted);
result.Deleted.AddRange(right.Deleted);
// The choice of side for the placeholder is arbitrary, since CQTs enforce type compatibility
// for the left and right hand sides of the union.
result.Placeholder = left.Placeholder;
return(result);
}
public override object Visit(DbUnionAllExpression expression)
{
this.Visit(expression.Left);
this.Visit(expression.Right);
return(null);
}
public override LegacyCommandTrees.DbExpression Visit(DbUnionAllExpression expression)
{
Debug.Assert(expression != null, "expression != null");
return
(expression.Left.Accept(this).UnionAll(expression.Right.Accept(this)));
}
public override void Visit(DbUnionAllExpression e)
{
Check.NotNull(e, "e");
BeginBinary(e);
End(e);
}
public override void Visit(DbUnionAllExpression expression)
{
Write(expression);
_depth++;
Write("Left", expression.Left);
Write("Right", expression.Right);
_depth--;
}
/// <summary>
/// Implements the visitor pattern for <see cref="T:System.Data.Common.CommandTrees.DbUnionAllExpression"/>.
/// </summary>
/// <param name="expression">The <see cref="T:System.Data.Common.CommandTrees.DbUnionAllExpression"/> that is visited.</param>
public override void Visit(DbUnionAllExpression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
expression.Left.Accept(this);
expression.Right.Accept(this);
}
/// <summary>
/// Implements the visitor pattern for <see cref="T:System.Data.Common.CommandTrees.DbUnionAllExpression"/>.
/// </summary>
/// <param name="expression">The <see cref="T:System.Data.Common.CommandTrees.DbUnionAllExpression"/> that is visited.</param>
public override void Visit(DbUnionAllExpression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
expression.Left.Accept(this);
expression.Right.Accept(this);
}
public override Expression Visit(DbUnionAllExpression expression)
{
Type resultType = edmTypeConverter.Convert(expression.ResultType);
Expression left = this.Visit(expression.Left);
Expression right = this.Visit(expression.Right);
var resultElemType = TypeHelper.GetElementType(resultType);
this.UnifyCollections(resultElemType, ref left, ref right);
return queryMethodExpressionBuilder.Concat(left, right);
}
public override Expression Visit(DbUnionAllExpression expression)
{
Type resultType = edmTypeConverter.Convert(expression.ResultType);
Expression left = this.Visit(expression.Left);
Expression right = this.Visit(expression.Right);
var resultElemType = TypeHelper.GetElementType(resultType);
this.UnifyCollections(resultElemType, ref left, ref right);
return(queryMethodExpressionBuilder.Concat(left, right));
}
public override SqlFragment Visit(DbUnionAllExpression expression)
{
UnionFragment f = new UnionFragment();
Debug.Assert(expression.Left is DbProjectExpression);
Debug.Assert(expression.Right is DbProjectExpression);
SelectStatement left = VisitInputExpressionEnsureSelect(expression.Left, null, null);
Debug.Assert(left.Name == null);
left.Wrap(null);
SelectStatement right = VisitInputExpressionEnsureSelect(expression.Right, null, null);
Debug.Assert(right.Name == null);
right.Wrap(null);
f.Left = left;
f.Right = right;
return(f);
}
/// <summary> /// Visitor pattern method for DbUnionAllExpression. /// </summary> /// <param name="expression"> The DbUnionAllExpression that is being visited. </param> public abstract void Visit(DbUnionAllExpression expression);
public override TreeNode Visit(DbUnionAllExpression e)
{
return(this.VisitBinary(e));
}
public override void Visit(DbUnionAllExpression e)
{
VisitBinary(e);
}
public override void Visit(DbUnionAllExpression expression)
{
throw new NotSupportedException("Visit(\"UnionAllExpression\") is not supported.");
}
/// <summary>
/// Visitor pattern method for <see cref="DbUnionAllExpression" />.
/// </summary>
/// <param name="expression"> The DbUnionAllExpression that is being visited. </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="expression" />
/// is null
/// </exception>
public override void Visit(DbUnionAllExpression expression)
{
Check.NotNull(expression, "expression");
VisitBinaryExpression(expression);
}
public override TReturn Visit(DbUnionAllExpression expression)
{
Check.NotNull(expression, "expression");
throw ConstructNotSupportedException(expression);
}
public override DbExpression Visit(DbUnionAllExpression expression)
{
System.Diagnostics.Debug.Print("Visit(DbUnionAllExpression): {0}", expression);
return(base.Visit(expression));
}
public override VfpExpression Visit(DbUnionAllExpression expression)
{
return(new VfpUnionAllExpression(expression.ResultType, expression.Left.Accept(this), expression.Right.Accept(this)));
}
/// <summary> /// Typed visitor pattern method for DbUnionAllExpression. /// </summary> /// <param name="expression"> The DbUnionAllExpression that is being visited. </param> /// <returns> An instance of TResultType. </returns> public abstract TResultType Visit(DbUnionAllExpression expression);
/// <summary>
/// <see cref="VisitBinaryExpression" />
/// </summary>
/// <param name="expression"> The DbUnionAllExpression that is being visited. </param>
/// <returns> </returns>
public override bool Visit(DbUnionAllExpression expression)
{
Check.NotNull(expression, "expression");
return(VisitBinaryExpression(expression));
}
public override void Visit(DbUnionAllExpression expression)
{
this.VisitBinaryExpression((DbBinaryExpression)expression);
}
public override void Visit(DbUnionAllExpression e)
{
Check.NotNull <DbUnionAllExpression>(e, nameof(e));
this.VisitBinary((DbBinaryExpression)e);
}
public override void Visit(DbUnionAllExpression expression) { }
public override void Visit(DbUnionAllExpression expression)
{
Contract.Requires(expression != null);
}
public override bool Visit(DbUnionAllExpression expression)
{
Check.NotNull <DbUnionAllExpression>(expression, nameof(expression));
return(this.VisitBinaryExpression((DbBinaryExpression)expression));
}
public override DbExpressionEntitySetInfo Visit(DbUnionAllExpression expression)
{
Check.NotNull(expression, "expression");
return(null);
}
/// <summary>
/// This code is shared by <see cref="Visit(DbExceptExpression)"/>
/// and <see cref="Visit(DbIntersectExpression)"/>
///
/// <see cref="VisitSetOpExpression"/>
/// Since the left and right expression may not be Sql select statements,
/// we must wrap them up to look like SQL select statements.
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
public override ISqlFragment Visit(DbUnionAllExpression e)
{
return(VisitSetOpExpression(e.Left, e.Right, "UNION ALL"));
}
public override DbExpression Visit(DbUnionAllExpression expression)
{
System.Diagnostics.Debug.Print("Visit(DbUnionAllExpression): {0}", expression);
return base.Visit(expression);
}
public override void Visit(DbUnionAllExpression expression)
{
throw new NotSupportedException("Visit(\"DbUnionAllExpression\") is not supported.");
}
public override bool Visit(DbUnionAllExpression expression)
{
return(VisitBinaryExpression(expression));
}
public override SqlFragment Visit(DbUnionAllExpression expression)
{
throw new NotImplementedException();
}
public override ViewValidator.DbExpressionEntitySetInfo Visit(
DbUnionAllExpression expression)
{
Check.NotNull <DbUnionAllExpression>(expression, nameof(expression));
return((ViewValidator.DbExpressionEntitySetInfo)null);
}
public override TreeNode Visit(DbUnionAllExpression e)
{
Check.NotNull <DbUnionAllExpression>(e, nameof(e));
return(this.VisitBinary((DbBinaryExpression)e));
}
public override TreeNode Visit(DbUnionAllExpression e)
{
Check.NotNull(e, "e");
return(VisitBinary(e));
}
/// <summary> /// Visitor pattern method for DbUnionAllExpression. /// </summary> /// <param name="expression"> The DbUnionAllExpression that is being visited. </param> public abstract void Visit(DbUnionAllExpression expression);
public override TReturn Visit(DbUnionAllExpression expression)
{
Check.NotNull <DbUnionAllExpression>(expression, nameof(expression));
throw this.ConstructNotSupportedException((DbExpression)expression);
}
public override SqlFragment Visit(DbUnionAllExpression expression)
{
UnionFragment f = new UnionFragment();
Debug.Assert(expression.Left is DbProjectExpression);
Debug.Assert(expression.Right is DbProjectExpression);
SelectStatement left = VisitInputExpressionEnsureSelect(expression.Left, null, null);
Debug.Assert(left.Name == null);
left.Wrap(null);
SelectStatement right = VisitInputExpressionEnsureSelect(expression.Right, null, null);
Debug.Assert(right.Name == null);
right.Wrap(null);
f.Left = left;
f.Right = right;
return f;
}
public override void Visit(DbUnionAllExpression e)
{
BeginBinary(e);
End(e);
}
public override void Visit(DbUnionAllExpression expression)
{
VisitBinary(expression);
}
public override void Visit(DbUnionAllExpression e)
{
Check.NotNull(e, "e");
VisitBinary(e);
}
public override DbExpressionEntitySetInfo Visit(DbUnionAllExpression expression)
{
return(null);
}
public override TReturn Visit(DbUnionAllExpression expression)
{
throw ConstructNotSupportedException(expression);
}
