public static bool ContainsSubquery(BoundExpression node)
{
var checker = new SubqueryChecker();
checker.VisitExpression(node);
return(checker.SubqueryFound);
}
private static bool NeedsRewriting(BoundJoinRelation node)
{
if (node.JoinType != BoundJoinType.FullOuter)
{
return(false);
}
if (SubqueryChecker.ContainsSubquery(node.Condition))
{
return(true);
}
var left = node.Left.GetOutputValues().ToImmutableArray();
var right = node.Right.GetOutputValues().ToImmutableArray();
var conjunctions = Expression.SplitConjunctions(node.Condition);
return(!conjunctions.Any(c => CanBeUsedForHashMatch(left, right, c)));
}