public override AlgebraNode VisitHashMatchAlgebraNode(HashMatchAlgebraNode node)
{
HashMatchIterator hashMatchIterator = new HashMatchIterator();
hashMatchIterator.RowBuffer = new object[node.OutputList.Length];
hashMatchIterator.Left = ConvertAlgebraNode(node.Left);
hashMatchIterator.LeftOutput = GetIteratorOutput(0, node.Left.OutputList, node.OutputList);
hashMatchIterator.Right = ConvertAlgebraNode(node.Right);
hashMatchIterator.RightOutput = GetIteratorOutput(hashMatchIterator.LeftOutput.Length, node.Right.OutputList, node.OutputList);
hashMatchIterator.BuildKeyEntry = GetIteratorInput(node.Left.OutputList, new RowBufferEntry[] { node.BuildKeyEntry })[0];
hashMatchIterator.ProbeEntry = GetIteratorInput(node.Right.OutputList, new RowBufferEntry[] { node.ProbeEntry })[0];
switch (node.Op)
{
case JoinAlgebraNode.JoinOperator.InnerJoin:
hashMatchIterator.LogicalOp = JoinType.Inner;
break;
case JoinAlgebraNode.JoinOperator.RightOuterJoin:
hashMatchIterator.LogicalOp = JoinType.RightOuter;
break;
case JoinAlgebraNode.JoinOperator.FullOuterJoin:
hashMatchIterator.LogicalOp = JoinType.FullOuter;
break;
default:
throw ExceptionBuilder.UnhandledCaseLabel(node.Op);
}
UpdatePredicateRowBufferReferences(hashMatchIterator, node);
SetLastIterator(node, hashMatchIterator);
return(node);
}
private void UpdatePredicateRowBufferReferences(HashMatchIterator hashMatchIterator, HashMatchAlgebraNode node)
{
if (node.ProbeResidual != null)
{
BoundRowBufferEntrySet leftBoundRowBufferEntrySet = new BoundRowBufferEntrySet(hashMatchIterator.Left.RowBuffer, node.Left.OutputList);
BoundRowBufferEntrySet rightBoundRowBufferEntrySet = new BoundRowBufferEntrySet(hashMatchIterator.Right.RowBuffer, node.Right.OutputList);
hashMatchIterator.ProbeResidual = CreateRuntimeExpression(node.ProbeResidual, leftBoundRowBufferEntrySet, rightBoundRowBufferEntrySet);
}
}
