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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/12/29 17:39:44 UTC

[GitHub] [arrow] tachyonwill commented on issue #15052: [C++][Parquet] Getting only 0 when reading DELTA_BINARY_PACKED

tachyonwill commented on issue #15052:
URL: https://github.com/apache/arrow/issues/15052#issuecomment-1367486164

   I was able to reproduce. I believe the problem is https://github.com/apache/arrow/blob/463cdccdf7a1914073b29f61915018b2045bb429/cpp/src/parquet/encoding.cc#L2482
   
   when requesting a single value at a time, `GetInternal` will never actually call `InitBlock`. Thus the only thing that will ever be written to the output is the first value from the header. The line should probably be
   ``
   if (ARROW_PREDICT_FALSE(i == total_value_count_)) break;
   `` 


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