// List of columns of this table that are nullable (and must have nulls pruned out)
#endregion
#region constructors
/// <summary>
/// Basic constructor
/// </summary>
/// <param name="id">node id</param>
/// <param name="node">scan table node</param>
internal AugmentedTableNode(int id, Node node)
: base(id, node)
{
var scanTableOp = (ScanTableOp)node.Op;
m_table = scanTableOp.Table;
LastVisibleId = id;
m_replacementTable = this;
m_newLocationId = id;
}
/// <summary>
/// Creates a new var for a table column
/// </summary>
/// <param name="table">The table instance that produces the column</param>
/// <param name="columnMD">column metadata</param>
/// <returns>A new ColumnVar instance that references the specified column in the given table</returns>
internal ColumnVar CreateColumnVar(Table table, ColumnMD columnMD)
{
// create a new column var now
ColumnVar c = new ColumnVar(NewVarId(), table, columnMD);
table.Columns.Add(c);
m_vars.Add(c);
return c;
}
/// <summary>
/// Creates a new table instance
/// </summary>
/// <param name="tableMetadata">table metadata</param>
/// <returns>A new Table instance with columns as defined in the specified metadata</returns>
internal Table CreateTableInstance(TableMD tableMetadata)
{
Table t = new Table(this, tableMetadata, NewTableId());
m_tables.Add(t);
return t;
}
/// <summary>
/// Creates a new UnnestOp - a variant of the above with the Table supplied
/// </summary>
/// <param name="v">the unnest Var</param>
/// <param name="t">the table instance</param>
/// <returns>a new UnnestOp</returns>
internal UnnestOp CreateUnnestOp(Var v, Table t)
{
return new UnnestOp(v, t);
}
/// <summary>
/// Creates an instance of a ScanViewOp
/// </summary>
/// <param name="table">the table instance</param>
/// <returns>a new ScanViewOp</returns>
internal ScanViewOp CreateScanViewOp(Table table)
{
return new ScanViewOp(table);
}
/// <summary>
/// Maps columns of an existing table to those of the cloned table
/// </summary>
/// <param name="newTable">The original Table</param>
/// <param name="oldTable">The cloned Table</param>
private void MapTable(Table newTable, Table oldTable)
{
// Map the corresponding columns of the table
// Now set up the column map
for (int i = 0; i < oldTable.Columns.Count; i++)
{
SetMappedVar(oldTable.Columns[i], newTable.Columns[i]);
}
}
/// <summary>
/// A variant of the above
/// </summary>
/// <param name="table">The table instance</param>
/// <returns>a new ScanTableOp</returns>
internal virtual ScanTableOp CreateScanTableOp(Table table)
{
return new ScanTableOp(table);
}