vanzin commented on a change in pull request #26108: [SPARK-26154][SS]
Streaming left/right outer join should not return outer nulls for already
matched rows
URL: https://github.com/apache/spark/pull/26108#discussion_r338828093
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/SymmetricHashJoinStateManager.scala
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@@ -82,40 +88,65 @@ class SymmetricHashJoinStateManager(
}
/** Append a new value to the key */
- def append(key: UnsafeRow, value: UnsafeRow): Unit = {
+ def append(key: UnsafeRow, value: UnsafeRow, matched: Boolean): Unit = {
val numExistingValues = keyToNumValues.get(key)
- keyWithIndexToValue.put(key, numExistingValues, value)
+ keyWithIndexToValue.put(key, numExistingValues, value, matched)
keyToNumValues.put(key, numExistingValues + 1)
}
+ /**
+ * Get all the matched values for given join condition, with marking matched.
+ * This method is designed to mark joined rows properly without exposing
internal index of row.
+ */
+ def getJoinedRows(
+ key: UnsafeRow,
+ generateJoinedRow: InternalRow => JoinedRow,
+ predicate: JoinedRow => Boolean): Iterator[JoinedRow] = {
+ val numValues = keyToNumValues.get(key)
+ keyWithIndexToValue.getAll(key, numValues).map { keyIdxToValue =>
+ val joinedRow = generateJoinedRow(keyIdxToValue.value)
+ if (predicate(joinedRow)) {
+ if (!keyIdxToValue.matched) {
+ // only update when matched flag is false
Review comment:
comment just repeats the code.
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