public override void AddRequiredColumns(IDictionary <string, DataSource> dataSources, IDictionary <string, Type> parameterTypes, IList <string> requiredColumns)
{
if (JoinCondition != null)
{
foreach (var col in JoinCondition.GetColumns())
{
if (!requiredColumns.Contains(col, StringComparer.OrdinalIgnoreCase))
{
requiredColumns.Add(col);
}
}
}
var leftSchema = LeftSource.GetSchema(dataSources, parameterTypes);
var leftColumns = requiredColumns
.Where(col => leftSchema.ContainsColumn(col, out _))
.Concat((IEnumerable <string>)OuterReferences?.Keys ?? Array.Empty <string>())
.Distinct()
.ToList();
var innerParameterTypes = GetInnerParameterTypes(leftSchema, parameterTypes);
var rightSchema = RightSource.GetSchema(dataSources, innerParameterTypes);
var rightColumns = requiredColumns
.Where(col => rightSchema.ContainsColumn(col, out _))
.Concat(DefinedValues.Values)
.Distinct()
.ToList();
LeftSource.AddRequiredColumns(dataSources, parameterTypes, leftColumns);
RightSource.AddRequiredColumns(dataSources, parameterTypes, rightColumns);
}