public void NormalizeQuerySpecification(QuerySpecification qs)
{
foreach (var sq in qs.EnumerateSubqueries())
{
NormalizeSelectStatement(sq.SelectStatement);
}
// Process join conditions
conditions = new List <LogicalExpressions.Expression>();
var from = qs.FindDescendant <FromClause>();
if (from != null)
{
var tablesource = from.FindDescendant <TableSourceExpression>();
foreach (JoinedTable jt in tablesource.EnumerateDescendantsRecursive <JoinedTable>(typeof(Subquery)))
{
// CROSS JOIN queries have no search condition
SearchCondition sc = jt.FindDescendant <SearchCondition>();
if (sc != null)
{
conditions.Add(GetConjunctiveNormalForm(sc));
}
}
}
// Process where clause
WhereClause where = qs.FindDescendant <WhereClause>();
if (where != null)
{
var sc = where.FindDescendant <SearchCondition>();
conditions.Add(GetConjunctiveNormalForm(sc));
}
}
public IEnumerable <SearchConditionReference> EnumerateConditions()
{
//*** This goes to the SkyQueryJob and the Condition normalizer
// TODO: this has to be updated to handle non conjunctive normal form predicates too
WhereClause wh = FindDescendant <WhereClause>();
if (wh == null)
{
yield break;
}
else
{
SearchCondition sc = wh.FindDescendant <SearchCondition>();
if (sc == null)
{
yield break;
}
else
{
foreach (object n in sc.Nodes)
{
SearchConditionReference wc;
if (n is Predicate)
{
wc = new SearchConditionReference((Predicate)n);
yield return(wc);
}
else if (n is SearchConditionBrackets)
{
wc = new SearchConditionReference((SearchConditionBrackets)n);
yield return(wc);
}
}
}
}
}
