/// <summary>
/// Find all vars that were referenced in the column map. Looks for VarRefColumnMap
/// in the ColumnMap tree, and tracks those vars
/// NOTE: The "vec" parameter must be supplied by the caller. The caller is responsible for
/// clearing out this parameter (if necessary) before calling into this function
/// </summary>
/// <param name="columnMap"> the column map to traverse </param>
/// <param name="vec"> the set of referenced columns </param>
internal static void FindVars(ColumnMap columnMap, VarVec vec)
{
var tracker = new ColumnMapVarTracker();
columnMap.Accept(tracker, vec);
return;
}
// <summary>
// Returns a string uniquely identifying the given ColumnMap.
// </summary>
internal static string GetColumnMapKey(ColumnMap columnMap, SpanIndex spanIndex)
{
var builder = new ColumnMapKeyBuilder(spanIndex);
columnMap.Accept(builder, 0);
return(builder._builder.ToString());
}
private void Append(string prefix, ColumnMap columnMap)
{
this.Append(prefix);
this.Append("[");
columnMap?.Accept <int>((ColumnMapVisitor <int>) this, 0);
this.Append("]");
}
internal static string GetColumnMapKey(ColumnMap columnMap, SpanIndex spanIndex)
{
ColumnMapKeyBuilder columnMapKeyBuilder = new ColumnMapKeyBuilder(spanIndex);
columnMap.Accept <int>((ColumnMapVisitor <int>)columnMapKeyBuilder, 0);
return(columnMapKeyBuilder._builder.ToString());
}
private void Append(string prefix, ColumnMap columnMap)
{
Append(prefix);
Append("[");
if (null != columnMap)
{
columnMap.Accept(this, 0);
}
Append("]");
}
internal virtual void Visit(ComplexTypeColumnMap columnMap, TArgType arg)
{
ColumnMap nullSentinel = columnMap.NullSentinel;
if (null != nullSentinel)
{
nullSentinel.Accept(this, arg);
}
foreach (var p in columnMap.Properties)
{
p.Accept(this, arg);
}
}
internal static void FindVars(ColumnMap columnMap, VarVec vec)
{
ProjectionPruner.ColumnMapVarTracker columnMapVarTracker = new ProjectionPruner.ColumnMapVarTracker();
columnMap.Accept <VarVec>((ColumnMapVisitor <VarVec>)columnMapVarTracker, vec);
}