public static ExprNodePropOrStreamSet GetAggregatedProperties(IList<ExprAggregateNode> aggregateNodes)
{
// Get a list of properties being aggregated in the clause.
ExprNodePropOrStreamSet propertiesAggregated = new ExprNodePropOrStreamSet();
ExprNodeIdentifierAndStreamRefVisitor visitor = new ExprNodeIdentifierAndStreamRefVisitor(true);
foreach (ExprNode selectAggExprNode in aggregateNodes) {
visitor.Reset();
selectAggExprNode.Accept(visitor);
IList<ExprNodePropOrStreamDesc> properties = visitor.Refs;
propertiesAggregated.AddAll(properties);
}
return propertiesAggregated;
}
public static ExprNodePropOrStreamSet GetGroupByPropertiesValidateHasOne(ExprNode[] groupByNodes)
{
// Get the set of properties refered to by all group-by expression nodes.
ExprNodePropOrStreamSet propertiesGroupBy = new ExprNodePropOrStreamSet();
ExprNodeIdentifierAndStreamRefVisitor visitor = new ExprNodeIdentifierAndStreamRefVisitor(true);
foreach (ExprNode groupByNode in groupByNodes) {
visitor.Reset();
groupByNode.Accept(visitor);
IList<ExprNodePropOrStreamDesc> propertiesNode = visitor.Refs;
propertiesGroupBy.AddAll(propertiesNode);
// For each group-by expression node, require at least one property.
if (propertiesNode.IsEmpty()) {
throw new ExprValidationException("Group-by expressions must refer to property names");
}
}
return propertiesGroupBy;
}
