init research

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

@@ -0,0 +1,21 @@
+import org.jetbrains.kotlinx.dataframe.*
+import org.jetbrains.kotlinx.dataframe.annotations.*
+import org.jetbrains.kotlinx.dataframe.api.*
+import org.jetbrains.kotlinx.dataframe.io.*
+import kotlinx.datetime.*
+
+fun box(): String {
+    val daysToStandardMillis = 24 * 60 * 60 * 1000L * 366
+    val df = dataFrameOf("a")(60L * 1000L + daysToStandardMillis).convert { a }.toLocalDateTime(TimeZone.UTC)
+    val localDateTime: LocalDateTime = df.a[0]
+
+    val df1 = dataFrameOf("a")(60L * 1000L + daysToStandardMillis, null).convert { a }.toLocalDateTime(TimeZone.UTC)
+    val localDateTime1: LocalDateTime? = df1.a[0]
+
+    val df2 = dataFrameOf("a")(123).convert { a }.toStr()
+    val str: String = df2.a[0]
+
+    val df3 = dataFrameOf("a")(123, null).convert { a }.toStr()
+    df3.compareSchemas(strict = true)
+    return "OK"
+}