corwinjoy commented on code in PR #39677:
URL: https://github.com/apache/arrow/pull/39677#discussion_r1458154525
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cpp/src/parquet/column_writer.cc:
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@@ -323,6 +323,19 @@ class SerializedPageWriter : public PageWriter {
PARQUET_THROW_NOT_OK(sink_->Write(output_data_buffer, output_data_len));
+ // Add the dictionary page to the offsets
+ if (offset_index_builder_ != nullptr) {
+ const int64_t compressed_size = output_data_len + header_size;
+ if (compressed_size > std::numeric_limits<int32_t>::max()) {
+ throw ParquetException("Compressed dictionary page size overflows to
INT32_MAX.");
+ }
+
+ /// start_pos is a relative offset in the buffered mode. It should be
+ /// adjusted via OffsetIndexBuilder::Finish() after BufferedPageWriter
+ /// has flushed all data pages.
+ offset_index_builder_->AddPage(start_pos,
static_cast<int32_t>(compressed_size), -1);
+ }
Review Comment:
At any rate, in this PR I wanted to be able to decode data directly without
having to read the full metadata header. For dictionary pages I was unable to
guess the location just from the data page (because dictionary pages can have
varying sizes). So, I added this information to the PageOffset since I felt it
made sense to have it there, but this may not be within the PageIndex spec.
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