[PARQUET-2066] [C++][Parquet] num_rows is incorrect for nested types

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: parquet-cpp
• Assignee: Unassigned
• Reporter: Jorge Leitão
• Created: 16/Jul/21 06:41
• Updated: 16/Jul/21 06:56

Description

Data pages v2 have:

• num_rows
• num_values

we write num_rows equal to the num_values. However, they represent different aspects.

Given a list such as "[[0, 1], None, [2, None, 3]]", num_rows = 3 and num_values = 6. We currently report 6 in both instances.