/// <summary>
/// Creates a transitively generated join edge
/// </summary>
/// <param name="left">the left table</param>
/// <param name="right">the right table</param>
/// <param name="joinKind">the join kind</param>
/// <param name="leftVars">left equijoin vars</param>
/// <param name="rightVars">right equijoin vars</param>
/// <returns>the join edge</returns>
internal static JoinEdge CreateTransitiveJoinEdge(
AugmentedTableNode left, AugmentedTableNode right, JoinKind joinKind,
List<ColumnVar> leftVars, List<ColumnVar> rightVars)
{
var joinEdge = new JoinEdge(left, right, null, joinKind, leftVars, rightVars);
return joinEdge;
}
internal static JoinEdge CreateJoinEdge(
AugmentedTableNode left, AugmentedTableNode right,
AugmentedJoinNode joinNode,
ColumnVar leftVar, ColumnVar rightVar)
{
var leftVars = new List<ColumnVar>();
var rightVars = new List<ColumnVar>();
leftVars.Add(leftVar);
rightVars.Add(rightVar);
var joinOpType = joinNode.Node.Op.OpType;
PlanCompiler.Assert(
(joinOpType == OpType.LeftOuterJoin || joinOpType == OpType.InnerJoin),
"Unexpected join type for join edge: " + joinOpType);
var joinKind = joinOpType == OpType.LeftOuterJoin ? JoinKind.LeftOuter : JoinKind.Inner;
var joinEdge = new JoinEdge(left, right, joinNode, joinKind, leftVars, rightVars);
return joinEdge;
}
