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Add more specific explodeLists overload that helps to avoid unnecessary cast #1269

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Merged
merged 1 commit into from
Jun 23, 2025
Merged

Add more specific explodeLists overload that helps to avoid unnecessary cast #1269

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1 change: 1 addition & 0 deletions core/api/core.api
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Original file line number Diff line number Diff line change
Expand Up @@ -2380,6 +2380,7 @@ public final class org/jetbrains/kotlinx/dataframe/api/Gather {

public final class org/jetbrains/kotlinx/dataframe/api/GatherKt {
public static final fun explodeLists (Lorg/jetbrains/kotlinx/dataframe/api/Gather;)Lorg/jetbrains/kotlinx/dataframe/api/Gather;
public static final fun explodeListsTyped (Lorg/jetbrains/kotlinx/dataframe/api/Gather;)Lorg/jetbrains/kotlinx/dataframe/api/Gather;
public static final fun gather (Lorg/jetbrains/kotlinx/dataframe/DataFrame;Lkotlin/jvm/functions/Function2;)Lorg/jetbrains/kotlinx/dataframe/api/Gather;
public static final fun gather (Lorg/jetbrains/kotlinx/dataframe/DataFrame;[Ljava/lang/String;)Lorg/jetbrains/kotlinx/dataframe/api/Gather;
public static final fun gather (Lorg/jetbrains/kotlinx/dataframe/DataFrame;[Lkotlin/reflect/KProperty;)Lorg/jetbrains/kotlinx/dataframe/api/Gather;
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13 changes: 13 additions & 0 deletions core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/api/gather.kt
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Expand Up @@ -71,6 +71,19 @@ public fun <T, C, K, R> Gather<T, C, K, R>.explodeLists(): Gather<T, C, K, R> =
explode = true,
)

@JvmName("explodeListsTyped")
@Interpretable("GatherExplodeLists")
public fun <T, C, K, R> Gather<T, List<C>, K, R>.explodeLists(): Gather<T, C, K, R> =
Gather(
df = df,
columns = columns,
filter = filter,
keyType = keyType,
keyTransform = keyTransform,
valueTransform = valueTransform,
explode = true,
) as Gather<T, C, K, R>

@Interpretable("GatherMap")
public inline fun <T, C, reified K, R> Gather<T, C, *, R>.mapKeys(
noinline transform: (String) -> K,
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15 changes: 15 additions & 0 deletions core/src/test/kotlin/org/jetbrains/kotlinx/dataframe/api/gather.kt
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Expand Up @@ -187,4 +187,19 @@ class GatherTests {
"b", 5,
)
}

@Test
fun `gather explode lists typed`() {
val df = dataFrameOf("list" to columnOf(listOf(1, 2, 3)))
.gather { "list"<List<Int>>() }
.explodeLists()
.mapValues { listOf(it) }
.into("key", "value")

df shouldBe dataFrameOf("key", "value")(
"list", listOf(1),
"list", listOf(2),
"list", listOf(3),
)
}
}