Fixes #5757

Fixes the bug #5757

The CI can be fixed by merging `main` into your branch. Can you do that before we merge ?

_The documentation is not available anymore as the PR was closed or merged._

Done.

On Thu, Apr 20, 2023 at 6:01 PM Quentin Lhoest ***@***.***>
wrote:

> The CI can be fixed by merging main into your branch. Can you do that
> before we merge ?
>
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Nice thanks !

<details>
<summary>Show benchmarks</summary>

PyArrow==8.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.007161 / 0.011353 (-0.004192) | 0.005099 / 0.011008 (-0.005909) | 0.099301 / 0.038508 (0.060793) | 0.034144 / 0.023109 (0.011034) | 0.298273 / 0.275898 (0.022375) | 0.329009 / 0.323480 (0.005529) | 0.005486 / 0.007986 (-0.002500) | 0.003887 / 0.004328 (-0.000441) | 0.074769 / 0.004250 (0.070518) | 0.047505 / 0.037052 (0.010453) | 0.306550 / 0.258489 (0.048061) | 0.335380 / 0.293841 (0.041540) | 0.034796 / 0.128546 (-0.093750) | 0.012152 / 0.075646 (-0.063495) | 0.332194 / 0.419271 (-0.087077) | 0.049661 / 0.043533 (0.006128) | 0.296832 / 0.255139 (0.041693) | 0.316417 / 0.283200 (0.033218) | 0.098234 / 0.141683 (-0.043449) | 1.494114 / 1.452155 (0.041959) | 1.566468 / 1.492716 (0.073751) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.221309 / 0.018006 (0.203303) | 0.440855 / 0.000490 (0.440365) | 0.003025 / 0.000200 (0.002825) | 0.000076 / 0.000054 (0.000021) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.026594 / 0.037411 (-0.010817) | 0.110406 / 0.014526 (0.095880) | 0.116117 / 0.176557 (-0.060439) | 0.173502 / 0.737135 (-0.563633) | 0.121988 / 0.296338 (-0.174351) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.403307 / 0.215209 (0.188098) | 4.034146 / 2.077655 (1.956492) | 1.852162 / 1.504120 (0.348042) | 1.675643 / 1.541195 (0.134448) | 1.748851 / 1.468490 (0.280360) | 0.703458 / 4.584777 (-3.881319) | 3.809055 / 3.745712 (0.063343) | 2.118060 / 5.269862 (-3.151801) | 1.338394 / 4.565676 (-3.227282) | 0.086319 / 0.424275 (-0.337956) | 0.012195 / 0.007607 (0.004588) | 0.520814 / 0.226044 (0.294769) | 5.201074 / 2.268929 (2.932145) | 2.418384 / 55.444624 (-53.026240) | 2.085496 / 6.876477 (-4.790980) | 2.245638 / 2.142072 (0.103565) | 0.849042 / 4.805227 (-3.956185) | 0.171912 / 6.500664 (-6.328752) | 0.065691 / 0.075469 (-0.009778) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.159985 / 1.841788 (-0.681803) | 14.910867 / 8.074308 (6.836559) | 14.473926 / 10.191392 (4.282534) | 0.181532 / 0.680424 (-0.498891) | 0.017203 / 0.534201 (-0.516998) | 0.420805 / 0.579283 (-0.158479) | 0.426455 / 0.434364 (-0.007909) | 0.497086 / 0.540337 (-0.043251) | 0.593909 / 1.386936 (-0.793027) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.007688 / 0.011353 (-0.003665) | 0.005353 / 0.011008 (-0.005656) | 0.076869 / 0.038508 (0.038361) | 0.035030 / 0.023109 (0.011921) | 0.344649 / 0.275898 (0.068751) | 0.387669 / 0.323480 (0.064190) | 0.005913 / 0.007986 (-0.002072) | 0.004107 / 0.004328 (-0.000221) | 0.074111 / 0.004250 (0.069860) | 0.049351 / 0.037052 (0.012299) | 0.346061 / 0.258489 (0.087572) | 0.395499 / 0.293841 (0.101658) | 0.035549 / 0.128546 (-0.092997) | 0.012340 / 0.075646 (-0.063307) | 0.087031 / 0.419271 (-0.332241) | 0.049088 / 0.043533 (0.005556) | 0.342774 / 0.255139 (0.087635) | 0.362037 / 0.283200 (0.078837) | 0.100329 / 0.141683 (-0.041354) | 1.442349 / 1.452155 (-0.009806) | 1.551079 / 1.492716 (0.058363) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.228458 / 0.018006 (0.210452) | 0.446190 / 0.000490 (0.445701) | 0.000413 / 0.000200 (0.000213) | 0.000056 / 0.000054 (0.000001) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.029884 / 0.037411 (-0.007527) | 0.117527 / 0.014526 (0.103002) | 0.123221 / 0.176557 (-0.053335) | 0.172290 / 0.737135 (-0.564845) | 0.128682 / 0.296338 (-0.167657) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.420905 / 0.215209 (0.205696) | 4.199342 / 2.077655 (2.121687) | 2.007327 / 1.504120 (0.503207) | 1.814732 / 1.541195 (0.273537) | 1.893999 / 1.468490 (0.425509) | 0.712259 / 4.584777 (-3.872518) | 3.843402 / 3.745712 (0.097690) | 3.198514 / 5.269862 (-2.071348) | 1.678732 / 4.565676 (-2.886945) | 0.086435 / 0.424275 (-0.337840) | 0.012233 / 0.007607 (0.004626) | 0.526121 / 0.226044 (0.300077) | 5.190578 / 2.268929 (2.921650) | 2.473259 / 55.444624 (-52.971366) | 2.142795 / 6.876477 (-4.733682) | 2.277594 / 2.142072 (0.135521) | 0.846117 / 4.805227 (-3.959110) | 0.169458 / 6.500664 (-6.331206) | 0.065017 / 0.075469 (-0.010452) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.272479 / 1.841788 (-0.569309) | 15.086473 / 8.074308 (7.012165) | 14.659728 / 10.191392 (4.468336) | 0.163915 / 0.680424 (-0.516509) | 0.017561 / 0.534201 (-0.516640) | 0.422074 / 0.579283 (-0.157209) | 0.421963 / 0.434364 (-0.012401) | 0.490321 / 0.540337 (-0.050016) | 0.586854 / 1.386936 (-0.800083) |

</details>
</details>

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