tiny fix for rendering the type in describe(). It could result in "Void?", while we already caught this case in renderType(kType)

Author: Jolanrensen

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/api/describe.kt

@@ -25,10 +25,10 @@ import org.jetbrains.kotlinx.dataframe.columns.size
 import org.jetbrains.kotlinx.dataframe.columns.values
 import org.jetbrains.kotlinx.dataframe.impl.columns.addPath
 import org.jetbrains.kotlinx.dataframe.impl.columns.asAnyFrameColumn
+import org.jetbrains.kotlinx.dataframe.impl.renderType
 import org.jetbrains.kotlinx.dataframe.index
 import org.jetbrains.kotlinx.dataframe.kind
 import org.jetbrains.kotlinx.dataframe.type
-import kotlin.reflect.jvm.jvmErasure
 
 internal fun describeImpl(cols: List<AnyCol>): DataFrame<ColumnDescription> {
     fun List<AnyCol>.collectAll(atAnyDepth: Boolean): List<AnyCol> =
@@ -65,7 +65,7 @@ internal fun describeImpl(cols: List<AnyCol>): DataFrame<ColumnDescription> {
         if (hasLongPaths) {
             ColumnDescription::path from { it.path() }
         }
-        ColumnDescription::type from { buildTypeName(it) }
+        ColumnDescription::type from { renderType(it.type) }
         ColumnDescription::count from { it.size }
         ColumnDescription::unique from { it.countDistinct() }
         ColumnDescription::nulls from { it.values.count { it == null } }
@@ -94,12 +94,3 @@ internal fun describeImpl(cols: List<AnyCol>): DataFrame<ColumnDescription> {
 
     return df.cast()
 }
-
-private fun buildTypeName(it: AnyCol): String {
-    val rawJavaType = it.type.jvmErasure.simpleName.toString()
-    return if (it.type.isMarkedNullable) {
-        "$rawJavaType?"
-    } else {
-        rawJavaType
-    }
-}