init research

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

@@ -0,0 +1,23 @@
+import org.jetbrains.kotlinx.dataframe.*
+import org.jetbrains.kotlinx.dataframe.annotations.*
+import org.jetbrains.kotlinx.dataframe.api.*
+import org.jetbrains.kotlinx.dataframe.io.*
+
+fun box(): String {
+    val df = DataFrame.readCSV("https://raw.githubusercontent.com/Kotlin/dataframe/master/data/jetbrains_repositories.csv")
+
+    df.stargazers_count.print()
+
+    df.filter { stargazers_count > 50 }.print()
+
+    df.add("hello") { 42 }.hello
+
+    df
+        .add("hello") { 42 }
+        .add("hello1") { hello + 3}
+
+    df.sortByDesc { stargazers_count }.print(rowsLimit = 10)
+    println(df.count { stargazers_count > 50 })
+    println(df.count { stargazers_count == 0 })
+    return "OK"
+}