Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5061#discussion_r26916328
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala ---
@@ -212,6 +212,22 @@ class SQLContext(@transient val sparkContext:
SparkContext)
val udf: UDFRegistration = new UDFRegistration(this)
/**
+ * Call an user-defined function which is registered
+ * in functionRegistry.
+ * Example:
+ * {{{
+ * import org.apache.spark.sql._
+ *
+ * val df = Seq(("id1", 1), ("id2", 4), ("id3", 5)).toDF("id", "value")
+ * val sqlctx = df.sqlContext
+ * sqlctx.udf.register("simpleUdf", (v: Int) => v * v)
+ * df.select($"id", sqlctx.callUdf("simpleUdf", $"value"))
+ * }}}
+ */
+ def callUdf(udfName: String, cols: Column*): Column =
--- End diff --
> This probably belongs in functions.scala with the other callUDF methods.
This is still defined in the wrong file.
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