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fix: prevent native sort crash for Struct(Map(...)) keys #4157

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Merged
andygrove merged 5 commits into from
May 7, 2026
Merged

fix: prevent native sort crash for Struct(Map(...)) keys #4157

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bf23753
fix: fallback Struct(Map(...)) sort/group keys to Spark
0lai0 Apr 30, 2026
d801762
add skip spark3.X
0lai0 May 6, 2026
8f94380
Merge branch 'main' into feat-4123-Struct/Map
0lai0 May 6, 2026
9103268
add isSpark41Plus
0lai0 May 7, 2026
23720b6
Merge branch 'main' into feat-4123-Struct/Map
0lai0 May 7, 2026
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17 changes: 10 additions & 7 deletions spark/src/main/scala/org/apache/spark/sql/comet/operators.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ import org.apache.spark.sql.execution.exchange.ReusedExchangeExec
import org.apache.spark.sql.execution.joins.{BroadcastHashJoinExec, HashJoin, ShuffledHashJoinExec, SortMergeJoinExec}
import org.apache.spark.sql.execution.metric.{SQLMetric, SQLMetrics}
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types.{ArrayType, BooleanType, ByteType, DataType, DateType, DecimalType, DoubleType, FloatType, IntegerType, LongType, MapType, ShortType, StringType, TimestampNTZType}
import org.apache.spark.sql.types.{ArrayType, BooleanType, ByteType, DataType, DateType, DecimalType, DoubleType, FloatType, IntegerType, LongType, MapType, ShortType, StringType, StructType, TimestampNTZType}
import org.apache.spark.sql.vectorized.ColumnarBatch
import org.apache.spark.util.SerializableConfiguration
import org.apache.spark.util.io.ChunkedByteBuffer
Expand Down Expand Up @@ -1350,6 +1350,13 @@ case class CometUnionExec(

trait CometBaseAggregate {

private def containsMapType(dt: DataType): Boolean = dt match {
case _: MapType => true
case StructType(fields) => fields.exists(f => containsMapType(f.dataType))
case ArrayType(elementType, _) => containsMapType(elementType)
case _ => false
}

def doConvert(
aggregate: BaseAggregateExec,
builder: Operator.Builder,
Expand Down Expand Up @@ -1377,12 +1384,8 @@ trait CometBaseAggregate {
return None
}

if (groupingExpressions.exists(expr =>
expr.dataType match {
case _: MapType => true
case _ => false
})) {
withInfo(aggregate, "Grouping on map types is not supported")
if (groupingExpressions.exists(expr => containsMapType(expr.dataType))) {
withInfo(aggregate, "Grouping on map-containing types is not supported")
return None
}

Expand Down
41 changes: 41 additions & 0 deletions spark/src/test/scala/org/apache/comet/exec/CometAggregateSuite.scala
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Expand Up @@ -408,6 +408,32 @@ class CometAggregateSuite extends CometTestBase with AdaptiveSparkPlanHelper {
}
}

test("grouping on struct containing map should fallback to Spark") {
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@andygrove andygrove May 5, 2026

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may need to skip this for Spark 3.x with assume(isSpark40Plus)

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@andygrove andygrove May 5, 2026

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actually isSpark41Plus

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@0lai0 0lai0 May 6, 2026

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Thanks for point this out. I missed that. I'll add it in next commit.

withSQLConf(
CometConf.COMET_EXEC_LOCAL_TABLE_SCAN_ENABLED.key -> "true",
CometConf.COMET_EXEC_SHUFFLE_ENABLED.key -> "true") {
val query =
"""SELECT col1.data['key']
|FROM VALUES
| (NAMED_STRUCT('data', MAP('key', 'value', 'num', '42'))),
| (NAMED_STRUCT('data', MAP('key', 'other', 'num', '7')))
|t (col1)
|GROUP BY col1
|HAVING col1.data['num'] IS NOT NULL
|ORDER BY col1.data['key']
|""".stripMargin

val (_, cometPlan) =
checkSparkAnswerAndFallbackReason(
query,
"Grouping on map-containing types is not supported")

assert(
stripAQEPlan(cometPlan).collect { case s: CometHashAggregateExec => s }.isEmpty,
"Expected aggregate to fall back to Spark for grouping on Struct(Map(...))")
}
}

test("simple SUM, COUNT, MIN, MAX, AVG with non-distinct + null group keys") {
Seq(true, false).foreach { dictionaryEnabled =>
withParquetTable(
Expand Down Expand Up @@ -1990,4 +2016,19 @@ class CometAggregateSuite extends CometTestBase with AdaptiveSparkPlanHelper {
sparkPlan.collect { case s: CometHashAggregateExec => s }.size
}

test("group by array of map falls back to Spark (issue #4123)") {
withSQLConf(CometConf.COMET_EXEC_LOCAL_TABLE_SCAN_ENABLED.key -> "true") {
checkSparkAnswerAndFallbackReason(
"""SELECT a, COUNT(*)
|FROM VALUES
| (ARRAY(MAP('x', 10))),
| (ARRAY(MAP('y', 20))),
| (ARRAY(MAP('x', 10)))
|t (a)
|GROUP BY a
|""".stripMargin,
"Grouping on map-containing types is not supported")
}
}

}
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