[GitHub] [arrow] mapleFU commented on a diff in pull request #36012: GH-35859: [Python] Actually change the default row group size to 1Mi

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

mapleFU commented on code in PR #36012:
URL: https://github.com/apache/arrow/pull/36012#discussion_r1224493168


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python/pyarrow/_parquet.pyx:
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@@ -1767,7 +1767,7 @@ cdef class ParquetWriter(_Weakrefable):
             int64_t c_row_group_size
 
         if row_group_size is None or row_group_size == -1:
-            c_row_group_size = ctable.num_rows()
+            c_row_group_size = min(ctable.num_rows(), 1024*1024)

Review Comment:
   should we declare a constant rather than 1024*1024 directly?



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