init research

2026-02-08 11:20:43 -10:00
commit bdf064f54d
3041 changed files with 1592200 additions and 0 deletions
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+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 = dataFrameOf("timestamps")(listOf(100, 113, 140), listOf(400, 410, 453))
+    val df1 = df.explode { timestamps }
+    val timestamps: DataColumn<Int> = df1.timestamps
+    timestamps.print()
+
+
+    val df2 = dataFrameOf("a", "b")(listOf(100, 113, 140), listOf(400, 410))
+    val df3 = df2.explode { a and b }
+    // exploding multiple columns will introduce nulls
+    df3.print()
+    // compiler needs to play safe and make both selected columns nullable
+    df3.compileTimeSchema().columns.let {
+        assert(it["a"]!!.nullable)
+        assert(it["b"]!!.nullable)
+    }
+    // compile time schema is still compatible with runtime
+    df3.compareSchemas()
+    return "OK"
+}