[GitHub] [arrow] fatemehp commented on a diff in pull request #14603: PARQUET-2210: [C++][Parquet] Skip pages based on header metadata using a callback

Wed, 14 Dec 2022 22:02:05 -0800 


fatemehp commented on code in PR #14603:
URL: https://github.com/apache/arrow/pull/14603#discussion_r1049244905


##########
cpp/src/parquet/column_reader.cc:
##########
@@ -386,6 +395,28 @@ std::shared_ptr<Page> SerializedPageReader::NextPage() {
       throw ParquetException("Invalid page header");
     }
 
+    const PageType::type page_type = LoadEnumSafe(&current_page_header_.type);
+    const bool is_data_page =
+        page_type == PageType::DATA_PAGE || page_type == 
PageType::DATA_PAGE_V2;
+
+    // Once we have the header, we will call the skip_page_call_back_ to
+    // determine if we should be skipping this page. If yes, we will advance 
the
+    // stream to the next page.
+    if (skip_page_callback_ && is_data_page) {
+      std::variant<format::DataPageHeader, format::DataPageHeaderV2> 
data_page_header;
+      if (page_type == PageType::DATA_PAGE) {
+        data_page_header = current_page_header_.data_page_header;
+      } else {
+        data_page_header = current_page_header_.data_page_header_v2;
+      }
+      std::unique_ptr<DataPageStats> data_page_stats =

Review Comment:
   I made that clear in the comments for setting the callback function.



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