[PARQUET-1972] [C++] Switch to format version 2 as default for writing Parquet

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: parquet-cpp
• Assignee: Unassigned
• Reporter: Joris Van den Bossche
• Created: 03/Feb/21 10:08
• Updated: 03/Feb/21 10:08

Description

Related to the thread on the arrow dev mailing list: https://lists.apache.org/thread.html/rf1a377c66990ae5ac0693119d416c93a7e19228d3eaaea8bd90acb17%40%3Cdev.arrow.apache.org%3E

Currently, when writing parquet files with Arrow (parquet-cpp), we default to parquet format "1.0". In practice, this means that we don't use certain LogicalTypes (eg we don't write integers other than int32/int64, and we don't write the nanosecond timestamps).

I think it would be nice to enable nanosecond timestamps by default, but I also have no idea how widely this is already supported by other readers.

To be clear, this is not about enabling data page version 2 by default, in Arrow that is governed by a separate option.

While checking this, I made an overview of which types were introduced in
which parquet format version, in case someone wants to see the details ->
https://nbviewer.jupyter.org/gist/jorisvandenbossche/3cc9942eaffb53564df65395e5656702