Fix RowSerializationEventConverterTest in opensearch-spark-30 to handle the StructType.toString format change in Spark 3.4+.

Signed-off-by: Sotaro Hikita <bering1814@gmail.com>

Author: lawofcycles

CHANGELOG.md

@@ -20,6 +20,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Fixed global refresh when using dynamic index patterns ([#686](https://github.com/opensearch-project/opensearch-hadoop/pull/686))
 - Fixed build failures when downloading Apache project dependencies (Hadoop, Hive, Spark) ([#595](https://github.com/opensearch-project/opensearch-hadoop/pull/595))
 - Fixed serverless mode SaveMode.Overwrite failing when document count exceeds scroll size ([#693](https://github.com/opensearch-project/opensearch-hadoop/pull/693))
+- Fixed RowSerializationEventConverterTest for Spark 3.4+ StructType.toString() format change ([#XXX](https://github.com/opensearch-project/opensearch-hadoop/pull/XXX))
 
 ### Security
 

spark/sql-30/src/test/scala/org/opensearch/spark/sql/RowSerializationEventConverterTest.scala

@@ -58,9 +58,11 @@ class RowSerializationEventConverterTest {
 
     val rawEvent = eventConverter.getRawEvent(iaeFailure)
 
-    // Scala 2.13 changed what toString() looks like, so can't do an exact match here:
-    assertTrue(rawEvent.contains("(StructField(field1,StringType,true), " +
-      "StructField(field2,StringType,true), StructField(field3,StringType,true)),[value1,value2,value3])"))
+    // Spark 3.4+ changed StructType.toString() format (wrapped in StructType(), no spaces after commas)
+    assertTrue(rawEvent.contains("StructField(field1,StringType,true)"))
+    assertTrue(rawEvent.contains("StructField(field2,StringType,true)"))
+    assertTrue(rawEvent.contains("StructField(field3,StringType,true)"))
+    assertTrue(rawEvent.contains("[value1,value2,value3]"))
     val timestamp = eventConverter.getTimestamp(iaeFailure)
     assertTrue(StringUtils.hasText(timestamp))
     assertTrue(DateUtils.parseDate(timestamp).getTime.getTime > 1L)