jubins commented on code in PR #56581:
URL: https://github.com/apache/spark/pull/56581#discussion_r3438641976


##########
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/csv/CSVSuite.scala:
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@@ -3588,6 +3588,72 @@ abstract class CSVSuite
       matchPVals = true)
   }
 
+  test("SPARK-57515: non-multiLine CSV read with header exceeding maxColumns 
surfaces " +
+    "MALFORMED_CSV_RECORD") {
+    // CSVHeaderChecker called tokenizer.parseLine(header) directly without 
the AIOOBE guard
+    // that UnivocityParser.parseLine wraps. A header line wider than 
maxColumns must surface
+    // as MALFORMED_CSV_RECORD, not a raw ArrayIndexOutOfBoundsException.
+    withTempPath { path =>
+      Files.write(path.toPath, 
"a,b,c\n1,2,3\n".getBytes(StandardCharsets.UTF_8))
+      val e = intercept[SparkRuntimeException] {
+        spark.read
+          .option("header", "true")
+          .option("maxColumns", "2")
+          .csv(path.getAbsolutePath)
+          .collect()
+      }
+      checkError(
+        exception = e,
+        condition = "MALFORMED_CSV_RECORD",
+        sqlState = Some("KD000"),
+        parameters = Map("badRecord" -> ".*"),
+        matchPVals = true)

Review Comment:
   good catch, changed to `parameters = Map("badRecord" -> "a,b,c")` and 
`matchPVals = false`



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