maropu commented on a change in pull request #20965: [SPARK-21870][SQL] Split aggregation code into small functions URL: https://github.com/apache/spark/pull/20965#discussion_r316932766
########## File path: sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/HashAggregateExec.scala ########## @@ -267,29 +302,81 @@ case class HashAggregateExec( e.aggregateFunction.asInstanceOf[DeclarativeAggregate].mergeExpressions } } - ctx.currentVars = bufVars ++ input - val boundUpdateExpr = bindReferences(updateExpr, inputAttrs) - val subExprs = ctx.subexpressionEliminationForWholeStageCodegen(boundUpdateExpr) - val effectiveCodes = subExprs.codes.mkString("\n") - val aggVals = ctx.withSubExprEliminationExprs(subExprs.states) { - boundUpdateExpr.map(_.genCode(ctx)) - } - // aggregate buffer should be updated atomic - val updates = aggVals.zipWithIndex.map { case (ev, i) => + + if (!conf.codegenSplitAggregateFunc) { + ctx.currentVars = bufVars ++ input + val boundUpdateExpr = updateExpr.map(BindReferences.bindReference(_, inputAttrs)) + val subExprs = ctx.subexpressionEliminationForWholeStageCodegen(boundUpdateExpr) + val effectiveCodes = subExprs.codes.mkString("\n") + val aggVals = ctx.withSubExprEliminationExprs(subExprs.states) { + boundUpdateExpr.map(_.genCode(ctx)) + } + // aggregate buffer should be updated atomic + val updates = aggVals.zipWithIndex.map { case (ev, i) => + s""" + | ${bufVars(i).isNull} = ${ev.isNull}; + | ${bufVars(i).value} = ${ev.value}; + """.stripMargin + } + s""" + | // do aggregate + | // common sub-expressions + | $effectiveCodes + | // evaluate aggregate function + | ${evaluateVariables(aggVals)} + | // update aggregation buffer + | ${updates.mkString("\n").trim} + """.stripMargin + } else { + // We need to copy the aggregation buffer to local variables first because each aggregate Review comment: Ur, I see. I never thought about that until now. plz give me some time. Based on the suggestion, I'll look for another solution. btw, I'll update the description, too. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org