# A prt:        10,000 × 1
# Partitioning: [10,000] rows
           a
       <int>
     1     1
     2     2
     3     3
     4     4
     5     5
     …
 9,996  9996
 9,997  9997
 9,998  9998
 9,999  9999
10,000 10000
# … with 9,990 more rows
