cloud-fan commented on a change in pull request #32528:
URL: https://github.com/apache/spark/pull/32528#discussion_r631716305
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/SortMergeJoinExec.scala
##########
@@ -679,60 +704,124 @@ case class SortMergeJoinExec(
(evaluateVariables(streamedVars), "")
}
- val thisPlan = ctx.addReferenceObj("plan", this)
- val eagerCleanup = s"$thisPlan.cleanupResources();"
-
- lazy val innerJoin =
+ val beforeLoop =
s"""
- |while (findNextJoinRows($streamedInput, $bufferedInput)) {
- | ${streamedVarDecl.mkString("\n")}
- | ${beforeLoop.trim}
- | scala.collection.Iterator<UnsafeRow> $iterator =
$matches.generateIterator();
- | while ($iterator.hasNext()) {
- | InternalRow $bufferedRow = (InternalRow) $iterator.next();
- | ${condCheck.trim}
- | $numOutput.add(1);
- | ${consume(ctx, resultVars)}
- | }
- | if (shouldStop()) return;
- |}
- |$eagerCleanup
- """.stripMargin
-
- lazy val outerJoin = {
- val hasOutputRow = ctx.freshName("hasOutputRow")
+ |${streamedVarDecl.mkString("\n")}
+ |${streamedBeforeLoop.trim}
+ |scala.collection.Iterator<UnsafeRow> $iterator =
$matches.generateIterator();
+ """.stripMargin
+ val outputRow =
s"""
- |while ($streamedInput.hasNext()) {
- | findNextJoinRows($streamedInput, $bufferedInput);
- | ${streamedVarDecl.mkString("\n")}
- | ${beforeLoop.trim}
- | scala.collection.Iterator<UnsafeRow> $iterator =
$matches.generateIterator();
- | boolean $hasOutputRow = false;
- |
- | // the last iteration of this loop is to emit an empty row if
there is no matched rows.
- | while ($iterator.hasNext() || !$hasOutputRow) {
- | InternalRow $bufferedRow = $iterator.hasNext() ?
- | (InternalRow) $iterator.next() : null;
- | ${condCheck.trim}
- | $hasOutputRow = true;
- | $numOutput.add(1);
- | ${consume(ctx, resultVars)}
- | }
- | if (shouldStop()) return;
- |}
- |$eagerCleanup
+ |$numOutput.add(1);
+ |${consume(ctx, resultVars)}
""".stripMargin
- }
+ val findNextJoinRows = s"findNextJoinRows($streamedInput, $bufferedInput)"
+ val thisPlan = ctx.addReferenceObj("plan", this)
+ val eagerCleanup = s"$thisPlan.cleanupResources();"
joinType match {
- case _: InnerLike => innerJoin
- case LeftOuter | RightOuter => outerJoin
+ case _: InnerLike =>
+ codegenInner(findNextJoinRows, beforeLoop, iterator, bufferedRow,
condCheck, outputRow,
+ eagerCleanup)
+ case LeftOuter | RightOuter =>
+ codegenOuter(streamedInput, findNextJoinRows, beforeLoop, iterator,
bufferedRow, condCheck,
+ ctx.freshName("hasOutputRow"), outputRow, eagerCleanup)
+ case LeftSemi =>
+ codegenSemi(findNextJoinRows, beforeLoop, iterator, bufferedRow,
condCheck,
+ ctx.freshName("hasOutputRow"), outputRow, eagerCleanup)
case x =>
throw new IllegalArgumentException(
s"SortMergeJoin.doProduce should not take $x as the JoinType")
}
}
+ /**
+ * Generates the code for Inner join.
+ */
+ private def codegenInner(
+ findNextJoinRows: String,
+ beforeLoop: String,
+ matchIterator: String,
+ bufferedRow: String,
+ conditionCheck: String,
+ outputRow: String,
+ eagerCleanup: String): String = {
+ s"""
+ |while ($findNextJoinRows) {
+ | ${beforeLoop.trim}
+ | while ($matchIterator.hasNext()) {
+ | InternalRow $bufferedRow = (InternalRow) $matchIterator.next();
+ | ${conditionCheck.trim}
+ | $outputRow
+ | }
+ | if (shouldStop()) return;
+ |}
+ |$eagerCleanup
+ """.stripMargin
+ }
+
+ /**
+ * Generates the code for Left or Right Outer join.
+ */
+ private def codegenOuter(
+ streamedInput: String,
+ findNextJoinRows: String,
+ beforeLoop: String,
+ matchIterator: String,
+ bufferedRow: String,
+ conditionCheck: String,
+ hasOutputRow: String,
+ outputRow: String,
+ eagerCleanup: String): String = {
+ s"""
+ |while ($streamedInput.hasNext()) {
+ | $findNextJoinRows;
+ | ${beforeLoop.trim}
+ | boolean $hasOutputRow = false;
+ |
+ | // the last iteration of this loop is to emit an empty row if there
is no matched rows.
+ | while ($matchIterator.hasNext() || !$hasOutputRow) {
+ | InternalRow $bufferedRow = $matchIterator.hasNext() ?
+ | (InternalRow) $matchIterator.next() : null;
+ | ${conditionCheck.trim}
+ | $hasOutputRow = true;
+ | $outputRow
+ | }
+ | if (shouldStop()) return;
+ |}
+ |$eagerCleanup
+ """.stripMargin
+ }
+
+ /**
+ * Generates the code for Left Semi join.
+ */
+ private def codegenSemi(
+ findNextJoinRows: String,
+ beforeLoop: String,
+ matchIterator: String,
+ bufferedRow: String,
+ conditionCheck: String,
+ hasOutputRow: String,
+ outputRow: String,
+ eagerCleanup: String): String = {
+ s"""
+ |while ($findNextJoinRows) {
+ | ${beforeLoop.trim}
+ | boolean $hasOutputRow = false;
Review comment:
I see, let's keep it
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