Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/8579#discussion_r38788635
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/SortMergeOuterJoin.scala
---
@@ -271,3 +297,203 @@ private class RightOuterIterator(
override def getRow: InternalRow = resultProj(joinedRow)
}
+
+private class SortMergeFullJoinScanner(
+ leftKeyGenerator: Projection,
+ rightKeyGenerator: Projection,
+ keyOrdering: Ordering[InternalRow],
+ leftIter: RowIterator,
+ numLeftRows: LongSQLMetric,
+ rightIter: RowIterator,
+ numRightRows: LongSQLMetric,
+ boundCondition: InternalRow => Boolean,
+ leftNullRow: InternalRow,
+ rightNullRow: InternalRow) {
+ private[this] val joinedRow: JoinedRow = new JoinedRow()
+ private[this] var leftRow: InternalRow = _
+ private[this] var leftRowKey: InternalRow = _
+ private[this] var rightRow: InternalRow = _
+ private[this] var rightRowKey: InternalRow = _
+
+ private[this] var leftIndex: Int = 0
+ private[this] var rightIndex: Int = 0
+ private[this] val leftMatches: ArrayBuffer[InternalRow] = new
ArrayBuffer[InternalRow]
+ private[this] val rightMatches: ArrayBuffer[InternalRow] = new
ArrayBuffer[InternalRow]
+ private[this] var leftMatched: BitSet = new BitSet(1)
+ private[this] var rightMatched: BitSet = new BitSet(1)
+
+ advancedLeft()
+ advancedRight()
+
+ // --- Private methods
--------------------------------------------------------------------------
+
+ /**
+ * Advance the left iterator and compute the new row's join key.
+ * @return true if the left iterator returned a row and false otherwise.
+ */
+ private def advancedLeft(): Boolean = {
+ if (leftIter.advanceNext()) {
+ leftRow = leftIter.getRow
+ leftRowKey = leftKeyGenerator(leftRow)
+ numLeftRows += 1
+ true
+ } else {
+ leftRow = null
+ leftRowKey = null
+ false
+ }
+ }
+
+ /**
+ * Advance the right iterator and compute the new row's join key.
+ * @return true if the right iterator returned a row and false otherwise.
+ */
+ private def advancedRight(): Boolean = {
+ if (rightIter.advanceNext()) {
+ rightRow = rightIter.getRow
+ rightRowKey = rightKeyGenerator(rightRow)
+ numRightRows += 1
+ true
+ } else {
+ rightRow = null
+ rightRowKey = null
+ false
+ }
+ }
+
+ /**
+ * Consume rows from both iterators until their key are different than
matchingKey.
--- End diff --
until their keys are different from the provided `matchingKey`
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