init research

dataframe/plugins/kotlin-dataframe/testData/box/toDataFrame_column.kt

@@ -0,0 +1,11 @@
+import org.jetbrains.kotlinx.dataframe.*
+import org.jetbrains.kotlinx.dataframe.annotations.*
+import org.jetbrains.kotlinx.dataframe.api.*
+import org.jetbrains.kotlinx.dataframe.io.*
+import java.io.File
+
+fun box(): String {
+    val df = listOf(File("abc.csv")).toDataFrame(columnName = "data")
+    val res: DataColumn<File> = df.data
+    return "OK"
+}