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[SPARK-32816][SQL] Fix analyzer bug when aggregating multiple distinct DECIMAL columns #29673

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[SPARK-32816][SQL] Fix analyzer bug when aggregating multiple distinct DECIMAL columns #29673

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b1ce4b5
[SPARK-32816][SQL] Fix analyzer bug when aggregating multiple distinc…
linhongliu-db Sep 8, 2020
4df4f7c
fix comments
linhongliu-db Sep 9, 2020
737f996
use temp view
linhongliu-db Sep 10, 2020
f2111df
change to SQLQueryTestSuite
linhongliu-db Sep 10, 2020
8510ff9
code clean
linhongliu-db Sep 11, 2020
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5 changes: 4 additions & 1 deletion sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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Expand Up @@ -142,7 +142,6 @@ abstract class Optimizer(catalogManager: CatalogManager)
RewriteNonCorrelatedExists,
ComputeCurrentTime,
GetCurrentDatabaseAndCatalog(catalogManager),
RewriteDistinctAggregates,
ReplaceDeduplicateWithAggregate) ::
//////////////////////////////////////////////////////////////////////////////////////////
// Optimizer rules start here
Expand Down Expand Up @@ -196,6 +195,10 @@ abstract class Optimizer(catalogManager: CatalogManager)
EliminateSorts) :+
Batch("Decimal Optimizations", fixedPoint,
DecimalAggregates) :+
// This batch must run after "Decimal Optimizations", as that one may change the
// aggregate distinct column
Batch("Distinct Aggregate Rewrite", Once,

@cloud-fan cloud-fan Sep 8, 2020

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can we add a comment to say: this batch must be run after "Decimal Optimizations", as "Decimal Optimizations" may change the aggregate distinct column?

RewriteDistinctAggregates) :+
Batch("Object Expressions Optimization", fixedPoint,
EliminateMapObjects,
CombineTypedFilters,
Expand Down
9 changes: 9 additions & 0 deletions sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
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Expand Up @@ -2555,6 +2555,15 @@ class DataFrameSuite extends QueryTest
val df = Seq(0.0 -> -0.0).toDF("pos", "neg")
checkAnswer(df.select($"pos" > $"neg"), Row(false))
}

test("SPARK-32816: aggregating multiple distinct DECIMAL columns") {
spark.range(0, 100, 1, 1)
.selectExpr("id", "cast(id as decimal(9, 0)) as decimal_col")
.createOrReplaceTempView("test_table")

@cloud-fan cloud-fan Sep 9, 2020

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nit: wrap the test with withTempView

@maropu maropu Sep 9, 2020

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How about writing it like this w/o a temp view;

  test("SPARK-32816: aggregating multiple distinct DECIMAL columns") {
    checkAnswer(
      sql(
        s"""
           |SELECT AVG(DISTINCT decimal_col), SUM(DISTINCT decimal_col)
           |  FROM VALUES (CAST(1 AS DECIMAL(9, 0))) t(decimal_col)
         """.stripMargin),
      Row(XXX, XXX))
  }

@maropu maropu Sep 9, 2020

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nit: Also, could you move this test into SQLQueryTestSuite?

@linhongliu-db linhongliu-db Sep 10, 2020

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let me try this, I'm not sure if literal will behave differently

checkAnswer(
sql("select avg(distinct decimal_col), sum(distinct decimal_col) from test_table"),
Row(49.5, 4950))
}
}

case class GroupByKey(a: Int, b: Int)