wjones127 commented on code in PR #35368:
URL: https://github.com/apache/arrow/pull/35368#discussion_r1187923808
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cpp/src/parquet/column_reader.cc:
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@@ -275,6 +275,10 @@ class SerializedPageReader : public PageReader {
}
// Implement the PageReader interface
+ //
+ // SerializedPageReader reuses same decryption buffer and decompression
buffer
+ // internal, so, if NextPage() is called, content of previous page might be
+ // invalidated.
Review Comment:
```suggestion
// The returned Page contains references that aren't guaranteed to live
// beyond the next call to NextPage(). SerializedPageReader reuses the
// decryption and decompression buffers internally, so if NextPage() is
// called then the content of previous page might be invalidated.
```
##########
cpp/src/parquet/column_reader.h:
##########
@@ -152,6 +152,10 @@ class PARQUET_EXPORT PageReader {
// @returns: shared_ptr<Page>(nullptr) on EOS, std::shared_ptr<Page>
// containing new Page otherwise
+ //
+ // In PageReader, it may reuse same underlying buffer, so, if
+ // NextPage() is called, content of previous page might be
+ // invalidated.
Review Comment:
```suggestion
// The returned Page may contain references that aren't guaranteed to live
// beyond the next call to NextPage().
```
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