[GitHub] [arrow] wgtmac commented on a diff in pull request #36574: GH-34950: [C++][Parquet] Support encryption for page index

["wgtmac (via GitHub)" <gi...@apache.org>]

wgtmac commented on code in PR #36574:
URL: https://github.com/apache/arrow/pull/36574#discussion_r1338814429


##########
cpp/src/parquet/encryption/internal_file_decryptor.cc:
##########
@@ -215,4 +217,53 @@ std::shared_ptr<Decryptor> InternalFileDecryptor::GetColumnDecryptor(
   return column_data_map_[column_path];
 }
 
+namespace {
+
+std::shared_ptr<Decryptor> GetColumnDecryptor(
+    const ColumnCryptoMetaData* crypto_metadata, InternalFileDecryptor* file_decryptor,
+    const std::function<std::shared_ptr<Decryptor>(
+        InternalFileDecryptor* file_decryptor, const std::string& column_path,
+        const std::string& column_key_metadata, const std::string& aad)>& func) {
+  if (crypto_metadata == nullptr) {
+    return nullptr;
+  }
+
+  if (file_decryptor == nullptr) {
+    throw ParquetException("RowGroup is noted as encrypted but no file decryptor");
+  }
+
+  if (crypto_metadata->encrypted_with_footer_key()) {
+    return file_decryptor->GetFooterDecryptorForColumnMeta();

Review Comment:
   Good catch! Sorry for the mistake made by the copy-and-paste.



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