init research

dataframe/plugins/kotlin-dataframe/testData/box/injectAccessors.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.*
+
+@DataSchema
+interface Cars {
+    val year: Int
+}
+
+fun `Name is evaluated to age`(df: DataFrame<Cars>) {
+    val df1 = df.add("age") { 2022 - year }
+    val col = df1.age
+}
+
+fun `ReturnType is evaluated to Int`(df: DataFrame<Cars>) {
+    val df1 = df.add("age") { 2022 - year }
+    val col: DataColumn<Int> = df1.age
+}
+
+fun box() = "OK"