private QueryStatement[] InitBuildNode(ArrayList statements, Hashtable setVars)
{
// Get the best statements to consider
// Because we can consider statements in groups, we need
// a list of lists.
QueryStatementComparer comparer = new QueryStatementComparer(setVars, fps, ifps);
ArrayList considerations = new ArrayList();
for (int i = 0; i < statements.Count; i++)
{
QueryStatement next = (QueryStatement)statements[i];
int comp = 1;
if (considerations.Count > 0)
{
QueryStatement curcomp = (QueryStatement)((ArrayList)considerations[0])[0];
comp = comparer.Compare(curcomp, next);
}
if (comp < 0) // next is worse than current
{
continue;
}
if (comp > 0) // clear out worse possibilities
{
considerations.Clear();
}
ArrayList group = new ArrayList();
group.Add(next);
considerations.Add(group);
}
// Pick the group with the most number of statements.
ArrayList bestgroup = null;
foreach (ArrayList g in considerations)
{
if (bestgroup == null || bestgroup.Count < g.Count)
{
bestgroup = g;
}
}
foreach (QueryStatement qs in bestgroup)
{
statements.Remove(qs);
}
return((QueryStatement[])bestgroup.ToArray(typeof(QueryStatement)));
}
private QueryStatement[] InitBuildNode(ArrayList statements, Hashtable setVars) {
// Get the best statements to consider
// Because we can consider statements in groups, we need
// a list of lists.
QueryStatementComparer comparer = new QueryStatementComparer(setVars, fps, ifps);
ArrayList considerations = new ArrayList();
for (int i = 0; i < statements.Count; i++) {
QueryStatement next = (QueryStatement)statements[i];
int comp = 1;
if (considerations.Count > 0) {
QueryStatement curcomp = (QueryStatement) ((ArrayList)considerations[0])[0];
comp = comparer.Compare(curcomp, next);
}
if (comp < 0) // next is worse than current
continue;
if (comp > 0) // clear out worse possibilities
considerations.Clear();
ArrayList group = new ArrayList();
group.Add(next);
considerations.Add(group);
}
// Pick the group with the most number of statements.
ArrayList bestgroup = null;
foreach (ArrayList g in considerations) {
if (bestgroup == null || bestgroup.Count < g.Count)
bestgroup = g;
}
foreach (QueryStatement qs in bestgroup)
statements.Remove(qs);
return (QueryStatement[])bestgroup.ToArray(typeof(QueryStatement));
}