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[SPARK-10437][SQL] Support aggregation expressions in Order By #8599

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[SPARK-10437][SQL] Support aggregation expressions in Order By #8599

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452cfb5
Support aggregation expressions in Order By.
viirya Sep 4, 2015
e65f4db
For comment.
viirya Sep 4, 2015
8f73c40
Remove orderByData2.
viirya Sep 5, 2015
6023c8b
Merge remote-tracking branch 'upstream/master' into orderby-agg
viirya Sep 5, 2015
ff532ac
Merge remote-tracking branch 'upstream/master' into orderby-agg
viirya Sep 9, 2015
046a8cb
Add more test.
viirya Sep 9, 2015
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2 changes: 1 addition & 1 deletion sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -561,7 +561,7 @@ class Analyzer(
}

case sort @ Sort(sortOrder, global, aggregate: Aggregate)
if aggregate.resolved && !sort.resolved =>
if aggregate.resolved =>
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We need to set up a stop condition for this rule, or something like SELECT a, SUM(b) FROM t GROUP BY a ORDER BY a will go through this rule again and again until reach the fixed point. How about changing the end of this rule to:

if (evaluatedOrderings == sortOrder) {
  sort
} else {
  Project(aggregate.output,
    Sort(evaluatedOrderings, global,
      aggregate.copy(aggregateExpressions = originalAggExprs ++ needsPushDown)))
}

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Thanks. I've updated it.


// Try resolving the ordering as though it is in the aggregate clause.
try {
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13 changes: 13 additions & 0 deletions sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
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Expand Up @@ -1519,6 +1519,19 @@ class SQLQuerySuite extends QueryTest with SharedSQLContext {
|ORDER BY sum(b) + 1
""".stripMargin),
Row("4", 3) :: Row("1", 7) :: Row("3", 11) :: Row("2", 15) :: Nil)

Seq("1" -> 3, "2" -> 7, "2" -> 8, "3" -> 5, "3" -> 6, "3" -> 2, "4" -> 1, "4" -> 2,
"4" -> 3, "4" -> 4).toDF("a", "b").registerTempTable("orderByData2")
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Why add orderByData2? I thought orderByData can also reproduce this issue?

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For orderByData the group by result would be ("4", 2), ("3", 2), ("2", 2), ("1", 2), so order by count(*) would be ambiguous.

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How about SELECT count(*) FROM orderByData GROUP BY a ORDER BY count(*)? The result would be (2), (2), (2), (2).

Actually we don't need to test the correctness here, only need to make sure count(*) works in ORDER BY.

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Ok. I think it works.


checkAnswer(
sql(
"""
|SELECT a, count(*)
|FROM orderByData2
|GROUP BY a
|ORDER BY count(*)
""".stripMargin),
Row("1", 1) :: Row("2", 2) :: Row("3", 3) :: Row("4", 4) :: Nil)
}

test("SPARK-7952: fix the equality check between boolean and numeric types") {
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