viirya commented on a change in pull request #25710: [SPARK-29008][SQL] Define
an individual method for each common subexpression in HashAggregateExec
URL: https://github.com/apache/spark/pull/25710#discussion_r321891508
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
##########
@@ -1028,13 +1028,57 @@ class CodegenContext {
// Get all the expressions that appear at least twice and set up the state
for subexpression
// elimination.
val commonExprs =
equivalentExpressions.getAllEquivalentExprs.filter(_.size > 1)
- val codes = commonExprs.map { e =>
- val expr = e.head
- // Generate the code for this expression tree.
- val eval = expr.genCode(this)
- val state = SubExprEliminationState(eval.isNull, eval.value)
- e.foreach(localSubExprEliminationExprs.put(_, state))
- eval.code.toString
+ val commonExprVals = commonExprs.map(_.head.genCode(this))
+
+ lazy val nonSplitExprCode = {
+ commonExprs.zip(commonExprVals).map { case (exprs, eval) =>
+ // Generate the code for this expression tree.
+ val state = SubExprEliminationState(eval.isNull, eval.value)
+ exprs.foreach(localSubExprEliminationExprs.put(_, state))
+ eval.code.toString
+ }
+ }
+
+ val codes = if (commonExprVals.map(_.code.length).sum >
SQLConf.get.methodSplitThreshold) {
Review comment:
Although the original method should contain not only common expressions, I
think this is good enough.
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