[C++][Parquet] Parquet V2 page headers have incorrect number of rows

[etseidl]

Describe the bug, including details regarding any error messages, version, and platform.

When writing Parquet files with version 2 page headers, the num_rows field is incorrect. This appears to be because in column_writer.cc ColumnWriterImpl::BuildDataPageV2() num_values is passed twice to the constructor for DataPageV2. The 4th argument should be num_rows.

To reproduce:

import pyarrow.parquet as pq
import pyarrow as pa
table = pa.table({'col0': [[1,2,3]]})
pq.write_table(table, 'bug.parquet', data_page_version="2.0")

Examining with parquet-cli:

% parquet-cli pages bug.parquet
Column: col0.list.item
--------------------------------------------------------------------------------
  page   type  enc  count   avg size   size       rows     nulls   min / max
  0-D    dict  S _  3       8.00 B     24 B      
  0-1    data  _ R  3       2.67 B     8 B        3        0       "1" / "3"

"rows" should be 1.
Rewriting the file with parquet-mr gives:

% parquet-cli pages bug-mr.parquet
Column: col0.list.element
--------------------------------------------------------------------------------
  page   type  enc  count   avg size   size       rows     nulls   min / max
  0-0    data  _ D  3       5.00 B     15 B       1        0       

Component(s)

C++, Parquet

[etseidl]

This might be easier to fix when #34054 is merged.

[wgtmac]

I exactly encounter this issue as well as other issues when I was implementing #34054. Will fix them shortly.