hsiang-c commented on code in PR #2447:
URL: https://github.com/apache/datafusion-comet/pull/2447#discussion_r2407800932
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spark/src/test/scala/org/apache/spark/sql/comet/ParquetEncryptionITCase.scala:
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@@ -191,6 +521,30 @@ class ParquetEncryptionITCase extends CometTestBase with
SQLTestUtils {
}
}
+ /**
+ * Verify that the directory contains an encrypted parquet in plaintext
footer mode by means of
+ * checking for all the parquet part files in the parquet directory that
their magic string is
+ * PAR1, as defined in the spec:
+ *
https://github.com/apache/parquet-format/blob/master/Encryption.md#55-plaintext-footer-mode
+ */
+ private def verifyParquetPlaintextFooter(parquetDir: String): Unit = {
+ val parquetPartitionFiles = getListOfParquetFiles(new File(parquetDir))
+ assert(parquetPartitionFiles.size >= 1)
+ parquetPartitionFiles.foreach { parquetFile =>
+ val magicString = "PAR1"
+ val magicStringLength = magicString.length()
+ val byteArray = new Array[Byte](magicStringLength)
+ val randomAccessFile = new RandomAccessFile(parquetFile, "r")
+ try {
+ randomAccessFile.read(byteArray, 0, magicStringLength)
Review Comment:
(nit) Do you think we should check the magic number at the tail?
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