[GitHub] HyukjinKwon commented on a change in pull request #23271: [SPARK-26318][SQL] Enhance function merge performance in Row

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HyukjinKwon commented on a change in pull request #23271: [SPARK-26318][SQL] Enhance function merge performance in Row
URL: https://github.com/apache/spark/pull/23271#discussion_r241937089
 
 

 ##########
 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/Row.scala
 ##########
 @@ -57,9 +57,29 @@ object Row {
   /**
    * Merge multiple rows into a single row, one after another.
    */
+
+  @deprecated("This method is deprecated and will be removed in future versions.", "3.0.0")
   def merge(rows: Row*): Row = {
-    // TODO: Improve the performance of this if used in performance critical part.
-    new GenericRow(rows.flatMap(_.toSeq).toArray)
+    var fSize, sSize = rows.size
+    var number = 0
+
+    while (fSize != 0) {
+      fSize -= 1
+      number += rows(fSize).size
+    }
+
+    val container = Array.ofDim[Any](number)
+
+    while (sSize != 0) {
+      sSize -= 1
+      var ssSize = rows(sSize).size
+      while (ssSize != 0) {
+        number -= 1
+        ssSize -= 1
+        container(number) = rows(sSize)(ssSize)
+      }
+    }
 
 Review comment:
   I would just leave the function as was. It will be removed in the next release anyway.

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