private JoinEdge(
AugmentedTableNode left, AugmentedTableNode right,
AugmentedJoinNode joinNode, JoinKind joinKind,
List<ColumnVar> leftVars, List<ColumnVar> rightVars)
{
m_left = left;
m_right = right;
JoinKind = joinKind;
m_joinNode = joinNode;
m_leftVars = leftVars;
m_rightVars = rightVars;
PlanCompiler.Assert(m_leftVars.Count == m_rightVars.Count, "Count mismatch: " + m_leftVars.Count + "," + m_rightVars.Count);
}
/// <summary>
/// Add a new "equi-join" condition to this edge
/// </summary>
/// <param name="joinNode">join node producing this condition</param>
/// <param name="leftVar">the left-side column</param>
/// <param name="rightVar">the right-side column</param>
/// <returns>true, if this condition can be added</returns>
internal bool AddCondition(AugmentedJoinNode joinNode, ColumnVar leftVar, ColumnVar rightVar)
{
if (joinNode != m_joinNode)
{
return false;
}
m_leftVars.Add(leftVar);
m_rightVars.Add(rightVar);
return true;
}
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;
}
