HuangXingBo commented on a change in pull request #15063:
URL: https://github.com/apache/flink/pull/15063#discussion_r586043837
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File path: flink-python/pyflink/fn_execution/coder_impl_fast.pyx
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@@ -700,8 +700,8 @@ cdef class FlattenRowCoderImpl(BaseCoderImpl):
# Row
row_field_coders = (<RowCoderImpl> field_coder).field_coders
row_field_count = len(row_field_coders)
- leading_complete_bytes_num = row_field_count // 8
- remaining_bits_num = row_field_count % 8
+ leading_complete_bytes_num = (row_field_count + ROW_KIND_BIT_SIZE)
// 8
+ remaining_bits_num = (row_field_count + ROW_KIND_BIT_SIZE % 8
Review comment:
```suggestion
remaining_bits_num = (row_field_count + ROW_KIND_BIT_SIZE) % 8
```
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