public override void DetermineDataType(Plan plan)
{
base.DetermineDataType(plan);
if (_sequenceColumn != null)
{
Schema.TableVarColumn column =
Compiler.CompileIncludeColumnExpression
(
plan,
_sequenceColumn,
Keywords.Sequence,
plan.DataTypes.SystemInteger,
Schema.TableVarColumnType.Sequence
);
DataType.Columns.Add(column.Column);
TableVar.Columns.Add(column);
_sequenceColumnIndex = TableVar.Columns.Count - 1;
Schema.Key sequenceKey = new Schema.Key();
sequenceKey.IsInherited = true;
sequenceKey.Columns.Add(column);
TableVar.Keys.Add(sequenceKey);
}
}
// Validate
protected override bool InternalValidate(Program program, IRow oldRow, IRow newRow, BitArray valueFlags, string columnName, bool isDescending, bool isProposable)
{
if (columnName == String.Empty)
{
PushNewRow(program, newRow);
try
{
foreach (Schema.TableVarColumn column in TableVar.Columns)
{
if (column.Constraints.Count > 0)
{
InternalValidateColumnConstraints(newRow, column, program);
}
}
}
finally
{
PopRow(program);
}
}
else
{
Schema.TableVarColumn column = TableVar.Columns[TableVar.Columns.IndexOfName(columnName)];
if ((column.Constraints.Count > 0) && newRow.HasValue(column.Name))
{
InternalValidateColumnConstraints(newRow, column, program);
}
}
return(base.InternalValidate(program, oldRow, newRow, valueFlags, columnName, isDescending, isProposable));
}
public int IndexOf(Schema.TableVarColumn column)
{
for (int index = 0; index < Count; index++)
{
if (this[index].Column == column)
{
return(index);
}
}
return(-1);
}
protected Expression EmitOriginNilExpression(Schema.TableVarColumn column, bool isNil)
{
if (isNil)
{
return(new CallExpression("IsNil", new Expression[] { new IdentifierExpression(Schema.Object.Qualify(column.Name, Keywords.Origin)) }));
}
else
{
return(new UnaryExpression(Instructions.Not, EmitOriginNilExpression(column, true)));
}
}
protected Expression EmitBrowseNilExpression(Schema.TableVarColumn column, bool isNil)
{
if (isNil)
{
return(new CallExpression("IsNil", new Expression[] { new IdentifierExpression(column.Name) }));
}
else
{
return(new UnaryExpression(Instructions.Not, EmitBrowseNilExpression(column, true)));
}
}
protected void InternalValidateColumnConstraints(IRow row, Schema.TableVarColumn column, Program program)
{
program.Stack.Push(row[column.Name]);
try
{
foreach (Schema.TableVarColumnConstraint constraint in column.Constraints)
{
constraint.Validate(program, Schema.Transition.Insert);
}
}
finally
{
program.Stack.Pop();
}
}
public ColumnConditions this[Schema.TableVarColumn column]
{
get
{
int index = IndexOf(column);
if (index < 0)
{
ColumnConditions conditions = new ColumnConditions(column);
Add(conditions);
return(conditions);
}
else
{
return(this[index]);
}
}
}
protected override void InternalOpen()
{
_sourceTables = new Stack(Program.Stack.MaxStackDepth, Program.Stack.MaxCallDepth);
_sourceTables.PushWindow(0);
_parentRows = new Stack(Program.Stack.MaxStackDepth, Program.Stack.MaxCallDepth);
_parentRows.PushWindow(0);
PushSourceTable(null);
_sourceRow = new Row(Manager, ((TableNode)Node.Nodes[0]).DataType.RowType);
_tableType = new Schema.TableType();
_tableVar = new Schema.BaseTableVar(_tableType, Program.TempDevice);
Schema.TableVarColumn newColumn;
foreach (Schema.TableVarColumn column in Node.TableVar.Columns)
{
newColumn = (Schema.TableVarColumn)column.Copy();
_tableType.Columns.Add(newColumn.Column);
_tableVar.Columns.Add(newColumn);
}
if (Node.SequenceColumnIndex < 0)
{
newColumn = new Schema.TableVarColumn(new Schema.Column(Keywords.Sequence, Program.DataTypes.SystemInteger), Schema.TableVarColumnType.Stored);
_tableType.Columns.Add(newColumn.Column);
_tableVar.Columns.Add(newColumn);
_sequenceColumnIndex = _tableVar.Columns.Count - 1;
}
else
{
_sequenceColumnIndex = Node.SequenceColumnIndex;
}
_targetRow = new Row(Manager, _tableType.RowType);
Schema.Key key = new Schema.Key();
key.Columns.Add(_tableVar.Columns[_sequenceColumnIndex]);
_tableVar.Keys.Add(key);
_buffer = new NativeTable(Manager, _tableVar);
_scan = new Scan(Manager, _buffer, _buffer.ClusteredIndex, ScanDirection.Forward, null, null);
_scan.Open();
_sequence = 0;
_empty = false;
InternalNext();
_empty = _scan.EOF();
_scan.First();
}
protected PlanNode EmitOriginNilNode(Plan plan, Schema.TableVarColumn column, bool isNil)
{
if (isNil)
{
return
(Compiler.EmitCallNode
(
plan,
"IsNil",
new PlanNode[] { Compiler.EmitIdentifierNode(plan, Schema.Object.Qualify(column.Name, Keywords.Origin)) }
));
}
else
{
return
(Compiler.EmitUnaryNode
(
plan,
Instructions.Not,
EmitOriginNilNode(plan, column, true)
));
}
}
protected PlanNode EmitBrowseNilNode(Plan plan, Schema.TableVarColumn column, bool isNil)
{
if (isNil)
{
return
(Compiler.EmitCallNode
(
plan,
"IsNil",
new PlanNode[] { Compiler.EmitIdentifierNode(plan, column.Name) }
));
}
else
{
return
(Compiler.EmitUnaryNode
(
plan,
Instructions.Not,
EmitBrowseNilNode(plan, column, true)
));
}
}
private bool ConvertSargableArguments(Plan plan)
{
// For each comparison,
// if the column referencing branch contains conversions, attempt to push the conversion to the context literal branch
// if successful, the comparison is still sargable, and a conversion is placed on the argument node for the condition
// otherwise, the comparison is not sargable, and a warning should be produced indicating the failure
// note that the original argument node is still participating in the condition expression
// this is acceptable because for sargable restrictions, the condition expression is only used
// for statement emission and device compilation, not for execution of the actual restriction.
bool canConvert = true;
for (int columnIndex = 0; columnIndex < _conditions.Count; columnIndex++)
{
Schema.TableVarColumn column = _conditions[columnIndex].Column;
for (int conditionIndex = 0; conditionIndex < _conditions[columnIndex].Count; conditionIndex++)
{
ColumnCondition condition = _conditions[columnIndex][conditionIndex];
if (!condition.ColumnReference.DataType.Equals(column.DataType))
{
// Find a conversion path to convert the type of the argument to the type of the column
ConversionContext conversionContext = Compiler.FindConversionPath(plan, condition.Argument.DataType, column.DataType);
if (conversionContext.CanConvert)
{
condition.Argument = Compiler.ConvertNode(plan, condition.Argument, conversionContext);
}
else
{
plan.Messages.Add(new CompilerException(CompilerException.Codes.CouldNotConvertSargableArgument, CompilerErrorLevel.Warning, plan.CurrentStatement(), column.Name, conversionContext.SourceType.Name, conversionContext.TargetType.Name));
canConvert = false;
}
}
}
}
return(canConvert);
}
public ColumnConditions(Schema.TableVarColumn column) : base()
{
Column = column;
}
public bool Contains(Schema.TableVarColumn column)
{
return(IndexOf(column) >= 0);
}
// TODO: Compile row types for each index, saving column indexes to prevent the need for lookup during insert, update, and delete.
private void Create(IValueManager manager)
{
TableType = TableVar.DataType;
RowType = TableType.RowType;
Schema.RowType keyRowType;
Schema.RowType dataRowType;
// Create the indexes required to store data as described by the given table variable
// Determine Fanout, Capacity, Clustering Key
Schema.Order clusteringKey = manager.FindClusteringOrder(TableVar);
keyRowType = new Schema.RowType(clusteringKey.Columns);
dataRowType = new Schema.RowType();
foreach (Schema.Column column in TableVar.DataType.Columns)
{
if (!clusteringKey.Columns.Contains(column.Name))
{
dataRowType.Columns.Add(new Schema.Column(column.Name, column.DataType));
}
}
// Add an internal identifier for uniqueness of keys in nonunique indexes
#if USEINTERNALID
_internalIDColumn = new Schema.TableVarColumn(new Schema.Column(InternalIDColumnName, manager.DataTypes.SystemGuid), Schema.TableVarColumnType.InternalID);
dataRowType.Columns.Add(_internalIDColumn.Column);
#endif
// Create the Clustered index
ClusteredIndex =
new NativeRowTree
(
clusteringKey,
keyRowType,
dataRowType,
_fanout,
_capacity,
true
);
// DataLength and DataColumns for all non clustered indexes is the key length and columns of the clustered key
dataRowType = keyRowType;
// Create non clustered indexes for each key and order (unique sets)
Schema.Order key;
foreach (Schema.Key nonClusteredKey in TableVar.Keys)
{
if (!nonClusteredKey.IsSparse && nonClusteredKey.Enforced)
{
if (!manager.OrderIncludesKey(ClusteredIndex.Key, nonClusteredKey))
{
key = manager.OrderFromKey(nonClusteredKey);
if (!NonClusteredIndexes.Contains(key))
{
keyRowType = new Schema.RowType(key.Columns);
NonClusteredIndexes.Add
(
new NativeRowTree
(
key,
keyRowType,
dataRowType,
_fanout,
_capacity,
false
)
);
}
}
}
else
{
// This is a potentially non-unique index, so add a GUID to ensure uniqueness of the key in the BTree
key = manager.OrderFromKey(nonClusteredKey);
#if USEINTERNALID
Schema.OrderColumn uniqueColumn = new Schema.OrderColumn(_internalIDColumn, key.IsAscending);
uniqueColumn.Sort = manager.GetUniqueSort(uniqueColumn.Column.DataType);
key.Columns.Add(uniqueColumn);
#endif
if (!NonClusteredIndexes.Contains(key))
{
keyRowType = new Schema.RowType(key.Columns);
NonClusteredIndexes.Add
(
new NativeRowTree
(
key,
keyRowType,
dataRowType,
_fanout,
_capacity,
false
)
);
}
}
}
foreach (Schema.Order order in TableVar.Orders)
{
// This is a potentially non-unique index, so add a GUID to ensure uniqueness of the key in the BTree
key = new Schema.Order(order);
#if USEINTERNALID
if (!manager.OrderIncludesOrder(key, clusteringKey))
{
Schema.OrderColumn uniqueColumn = new Schema.OrderColumn(_internalIDColumn, order.IsAscending);
uniqueColumn.Sort = manager.GetUniqueSort(uniqueColumn.Column.DataType);
key.Columns.Add(uniqueColumn);
}
#endif
if (!NonClusteredIndexes.Contains(key))
{
keyRowType = new Schema.RowType(key.Columns);
NonClusteredIndexes.Add
(
new NativeRowTree
(
key,
keyRowType,
dataRowType,
_fanout,
_capacity,
false
)
);
}
}
}
