public static void ReWrite(QueryModel model)
{
// firstly, get the group join clauses
var groupJoin = model.BodyClauses.OfType <GroupJoinClause>();
if (!groupJoin.Any())
{
// No group join here..
return;
}
// Now walk the tree to decide which groupings are fully aggregated (and can hence be done in hql)
var aggregateDetectorResults = IsAggregatingGroupJoin(model, groupJoin);
if (aggregateDetectorResults.AggregatingClauses.Count > 0)
{
NonAggregatingGroupJoinRewriter.RewriteGroupJoins(aggregateDetectorResults.AggregatingClauses, model);
// Re-write the select expression
model.SelectClause.TransformExpressions(s => GroupJoinSelectClauseRewriter.ReWrite(s, aggregateDetectorResults));
// Remove the aggregating group joins
foreach (var aggregatingGroupJoin in aggregateDetectorResults.AggregatingClauses)
{
model.BodyClauses.Remove(aggregatingGroupJoin);
}
}
}
