protected override NodeInfo VisitTableOp(ScanTableBaseOp op, Node n)
{
ExtendedNodeInfo extendedNodeInfo = this.InitExtendedNodeInfo(n);
extendedNodeInfo.LocalDefinitions.Or(op.Table.ReferencedColumns);
extendedNodeInfo.Definitions.Or(op.Table.ReferencedColumns);
if (op.Table.ReferencedColumns.Subsumes(op.Table.Keys))
{
extendedNodeInfo.Keys.InitFrom((IEnumerable <Var>)op.Table.Keys);
}
extendedNodeInfo.NonNullableDefinitions.Or(op.Table.NonNullableColumns);
extendedNodeInfo.NonNullableDefinitions.And(extendedNodeInfo.Definitions);
return((NodeInfo)extendedNodeInfo);
}
/// <summary>
/// Definitions = Local Definitions = referenced table columns
/// External References = none
/// Keys = keys of entity type
/// RowCount (default): MinRows = 0, MaxRows = *
/// NonNullableDefinitions : non nullable table columns that are definitions
/// NonNullableInputDefinitions : default(empty) because cannot be used
/// </summary>
/// <param name="op"> ScanTable/ScanView op </param>
/// <param name="n"> current subtree </param>
/// <returns> nodeinfo for this subtree </returns>
protected override NodeInfo VisitTableOp(ScanTableBaseOp op, Node n)
{
var nodeInfo = InitExtendedNodeInfo(n);
// #479372 - only the "referenced" columns of the table should
// show up in the definitions
nodeInfo.LocalDefinitions.Or(op.Table.ReferencedColumns);
nodeInfo.Definitions.Or(op.Table.ReferencedColumns);
// get table's keys - but only if the key columns have been referenced
if (op.Table.ReferencedColumns.Subsumes(op.Table.Keys))
{
nodeInfo.Keys.InitFrom(op.Table.Keys);
}
// no external references
//non-nullable definitions
nodeInfo.NonNullableDefinitions.Or(op.Table.NonNullableColumns);
nodeInfo.NonNullableDefinitions.And(nodeInfo.Definitions);
return(nodeInfo);
}
private void HandleTableOpMetadata(ScanTableBaseOp op)
{
// add to the list of referenced entitysets
var entitySet = op.Table.TableMetadata.Extent as EntitySet;
if (entitySet != null)
{
// If entitySet is an association set, the appropriate entity set references will be registered inside Visit(RefOp, Node).
AddEntitySetReference(entitySet);
}
var elementType = TypeUsage.Create(op.Table.TableMetadata.Extent.ElementType);
// add to the list of structured types
AddTypeReference(elementType);
}
/// <summary>
/// Default handler for all TableOps
/// </summary>
/// <param name="op"> </param>
/// <param name="n"> </param>
protected virtual void VisitTableOp(ScanTableBaseOp op, Node n)
{
VisitRelOpDefault(op, n);
}
protected virtual void VisitTableOp(ScanTableBaseOp op, Node n)
{
this.VisitRelOpDefault((RelOp)op, n);
}
// <summary>
// Default handler for all TableOps
// </summary>
protected virtual TResultType VisitTableOp(ScanTableBaseOp op, Node n)
{
return(VisitRelOpDefault(op, n));
}