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[SPARK-31975][SQL] Show AnalysisException when WindowFunction is used without WindowExpression #28808

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[SPARK-31975][SQL] Show AnalysisException when WindowFunction is used without WindowExpression #28808

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f283385
init
ulysses-you Jun 12, 2020
38df40a
typo
ulysses-you Jun 12, 2020
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update msg
ulysses-you Jun 12, 2020
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typo
ulysses-you Jun 13, 2020
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Merge branch 'master' of https://github.com/apache/spark into SPARK-3…
ulysses-you Jul 2, 2020
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nit
ulysses-you Jul 2, 2020
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check all expression
ulysses-you Jul 3, 2020
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nit
ulysses-you Jul 4, 2020
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3 changes: 3 additions & 0 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
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Expand Up @@ -158,6 +158,9 @@ trait CheckAnalysis extends PredicateHelper {
case g: GroupingID =>
failAnalysis("grouping_id() can only be used with GroupingSets/Cube/Rollup")

case Alias(w: WindowFunction, _) =>
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@cloud-fan cloud-fan Jul 2, 2020

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BTW why do we have to match the Alias?

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@ulysses-you ulysses-you Jul 3, 2020

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The right way is Alias(WindowExpression(w: WindowFunction, _), _) and without over it is Alias(w: WindowFunction, _).

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@cloud-fan cloud-fan Jul 3, 2020

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then the check doesn't work for cases like rank() + 1?

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@ulysses-you ulysses-you Jul 3, 2020

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good catch ! we need to check all expression.

failAnalysis(s"Expression '$w' not supported without a window function.")

case w @ WindowExpression(AggregateExpression(_, _, true, _, _), _) =>
failAnalysis(s"Distinct window functions are not supported: $w")

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5 changes: 5 additions & 0 deletions sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/AnalysisSuite.scala
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Expand Up @@ -826,4 +826,9 @@ class AnalysisSuite extends AnalysisTest with Matchers {
}
}
}

test("throw user facing error when use WindowFunction directly") {
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@HyukjinKwon HyukjinKwon Jul 3, 2020

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Shall we add a JIRA prefix here? SPARK-31975: ...

assertAnalysisError(testRelation2.select(RowNumber()),
Seq("Expression 'row_number()' not supported without a window function."))
}
}