LorenzoMartini commented on code in PR #36457:
URL: https://github.com/apache/spark/pull/36457#discussion_r866722337


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala:
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@@ -642,7 +642,7 @@ case class RegExpReplace(subject: Expression, regexp: 
Expression, rep: Expressio
     }
     val source = s.toString()
     val position = i.asInstanceOf[Int] - 1
-    if (position < source.length) {
+    if (position < source.length || (position == 0 && source.equals(""))) {

Review Comment:
   Changed to `isEmpty` in 0e8d78555f0fc54f6ae7331efa743bdb39c30819. Thanks for 
the look @srowen , let me know what you think :)



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