Title: Concatenate on axis=1 with misaligned blocks
State: closed

Allow to concatenate on axis 1 two tables made of misaligned blocks.
For example if the first table has 2 row blocks of 3 rows each, and the second table has 3 row blocks or 2 rows each.
To do that, I slice the row blocks to re-align the blocks.

Fix https://github.com/huggingface/datasets/issues/5413

Comments:
<details>
<summary>Show benchmarks</summary>

PyArrow==6.0.0

<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) | 0.008860 / 0.011353 (-0.002493) | 0.004564 / 0.011008 (-0.006444) | 0.101556 / 0.038508 (0.063048) | 0.030000 / 0.023109 (0.006891) | 0.304404 / 0.275898 (0.028506) | 0.366247 / 0.323480 (0.042767) | 0.007182 / 0.007986 (-0.000804) | 0.003583 / 0.004328 (-0.000746) | 0.079665 / 0.004250 (0.075415) | 0.036529 / 0.037052 (-0.000523) | 0.310998 / 0.258489 (0.052509) | 0.346954 / 0.293841 (0.053113) | 0.034098 / 0.128546 (-0.094448) | 0.011576 / 0.075646 (-0.064070) | 0.320448 / 0.419271 (-0.098824) | 0.043328 / 0.043533 (-0.000205) | 0.307317 / 0.255139 (0.052178) | 0.325071 / 0.283200 (0.041871) | 0.096406 / 0.141683 (-0.045277) | 1.540331 / 1.452155 (0.088176) | 1.589533 / 1.492716 (0.096817) |

### 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) | 0.011034 / 0.018006 (-0.006972) | 0.422066 / 0.000490 (0.421577) | 0.002409 / 0.000200 (0.002209) | 0.000071 / 0.000054 (0.000017) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.023703 / 0.037411 (-0.013708) | 0.099935 / 0.014526 (0.085409) | 0.105966 / 0.176557 (-0.070591) | 0.142259 / 0.737135 (-0.594876) | 0.109327 / 0.296338 (-0.187011) |

### 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) | 0.418381 / 0.215209 (0.203172) | 4.177564 / 2.077655 (2.099909) | 1.880196 / 1.504120 (0.376076) | 1.669169 / 1.541195 (0.127974) | 1.725989 / 1.468490 (0.257499) | 0.689384 / 4.584777 (-3.895393) | 3.380963 / 3.745712 (-0.364749) | 1.884192 / 5.269862 (-3.385670) | 1.162409 / 4.565676 (-3.403268) | 0.082045 / 0.424275 (-0.342230) | 0.012575 / 0.007607 (0.004968) | 0.525824 / 0.226044 (0.299779) | 5.272574 / 2.268929 (3.003646) | 2.283492 / 55.444624 (-53.161132) | 1.947390 / 6.876477 (-4.929087) | 2.013790 / 2.142072 (-0.128283) | 0.806280 / 4.805227 (-3.998948) | 0.149267 / 6.500664 (-6.351397) | 0.066967 / 0.075469 (-0.008502) |

### 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) | 1.216511 / 1.841788 (-0.625277) | 13.869829 / 8.074308 (5.795521) | 14.189967 / 10.191392 (3.998575) | 0.148716 / 0.680424 (-0.531708) | 0.028324 / 0.534201 (-0.505877) | 0.390856 / 0.579283 (-0.188427) | 0.404389 / 0.434364 (-0.029975) | 0.456050 / 0.540337 (-0.084287) | 0.544139 / 1.386936 (-0.842797) |

</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) | 0.006727 / 0.011353 (-0.004626) | 0.004515 / 0.011008 (-0.006494) | 0.098791 / 0.038508 (0.060283) | 0.027596 / 0.023109 (0.004487) | 0.439066 / 0.275898 (0.163168) | 0.480555 / 0.323480 (0.157076) | 0.005066 / 0.007986 (-0.002920) | 0.004669 / 0.004328 (0.000341) | 0.075334 / 0.004250 (0.071084) | 0.039779 / 0.037052 (0.002726) | 0.439860 / 0.258489 (0.181371) | 0.480787 / 0.293841 (0.186946) | 0.031550 / 0.128546 (-0.096996) | 0.011668 / 0.075646 (-0.063978) | 0.317348 / 0.419271 (-0.101923) | 0.041312 / 0.043533 (-0.002220) | 0.442934 / 0.255139 (0.187795) | 0.463677 / 0.283200 (0.180478) | 0.090066 / 0.141683 (-0.051617) | 1.544152 / 1.452155 (0.091998) | 1.584455 / 1.492716 (0.091738) |

### 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) | 0.224284 / 0.018006 (0.206278) | 0.406982 / 0.000490 (0.406492) | 0.000427 / 0.000200 (0.000227) | 0.000061 / 0.000054 (0.000006) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.024914 / 0.037411 (-0.012497) | 0.102608 / 0.014526 (0.088082) | 0.106931 / 0.176557 (-0.069626) | 0.140828 / 0.737135 (-0.596308) | 0.112015 / 0.296338 (-0.184324) |

### 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) | 0.471078 / 0.215209 (0.255869) | 4.705742 / 2.077655 (2.628088) | 2.437442 / 1.504120 (0.933322) | 2.242768 / 1.541195 (0.701573) | 2.302158 / 1.468490 (0.833668) | 0.697314 / 4.584777 (-3.887462) | 3.357730 / 3.745712 (-0.387982) | 1.913306 / 5.269862 (-3.356556) | 1.173879 / 4.565676 (-3.391798) | 0.083257 / 0.424275 (-0.341018) | 0.012480 / 0.007607 (0.004873) | 0.573407 / 0.226044 (0.347362) | 5.728650 / 2.268929 (3.459721) | 2.868863 / 55.444624 (-52.575761) | 2.548640 / 6.876477 (-4.327837) | 2.596622 / 2.142072 (0.454549) | 0.805563 / 4.805227 (-3.999664) | 0.150860 / 6.500664 (-6.349804) | 0.068344 / 0.075469 (-0.007125) |

### 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) | 1.300368 / 1.841788 (-0.541420) | 13.920451 / 8.074308 (5.846143) | 14.222430 / 10.191392 (4.031038) | 0.152497 / 0.680424 (-0.527927) | 0.017415 / 0.534201 (-0.516786) | 0.378827 / 0.579283 (-0.200456) | 0.384165 / 0.434364 (-0.050199) | 0.439364 / 0.540337 (-0.100973) | 0.525710 / 1.386936 (-0.861226) |

</details>
</details>

![](https://cml.dev/watermark.png#2cd22277fa87e02ad9970483f5b75aacdfbf9a70 "CML watermark")


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

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

PyArrow==6.0.0

<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) | 0.008482 / 0.011353 (-0.002871) | 0.004405 / 0.011008 (-0.006604) | 0.099662 / 0.038508 (0.061154) | 0.029062 / 0.023109 (0.005953) | 0.298329 / 0.275898 (0.022431) | 0.332837 / 0.323480 (0.009357) | 0.006760 / 0.007986 (-0.001225) | 0.003290 / 0.004328 (-0.001039) | 0.077659 / 0.004250 (0.073409) | 0.034745 / 0.037052 (-0.002307) | 0.303134 / 0.258489 (0.044644) | 0.346402 / 0.293841 (0.052561) | 0.033511 / 0.128546 (-0.095035) | 0.011464 / 0.075646 (-0.064183) | 0.322932 / 0.419271 (-0.096340) | 0.040697 / 0.043533 (-0.002836) | 0.301951 / 0.255139 (0.046812) | 0.328961 / 0.283200 (0.045761) | 0.084802 / 0.141683 (-0.056881) | 1.506247 / 1.452155 (0.054092) | 1.547631 / 1.492716 (0.054915) |

### 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) | 0.190370 / 0.018006 (0.172363) | 0.405786 / 0.000490 (0.405297) | 0.002196 / 0.000200 (0.001997) | 0.000072 / 0.000054 (0.000018) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.022958 / 0.037411 (-0.014453) | 0.095736 / 0.014526 (0.081210) | 0.103684 / 0.176557 (-0.072872) | 0.138200 / 0.737135 (-0.598936) | 0.105618 / 0.296338 (-0.190721) |

### 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) | 0.415239 / 0.215209 (0.200030) | 4.147223 / 2.077655 (2.069569) | 1.850322 / 1.504120 (0.346202) | 1.662815 / 1.541195 (0.121620) | 1.671563 / 1.468490 (0.203073) | 0.693806 / 4.584777 (-3.890971) | 3.352938 / 3.745712 (-0.392774) | 1.849257 / 5.269862 (-3.420604) | 1.161603 / 4.565676 (-3.404074) | 0.081884 / 0.424275 (-0.342391) | 0.012726 / 0.007607 (0.005119) | 0.521105 / 0.226044 (0.295061) | 5.231910 / 2.268929 (2.962981) | 2.306073 / 55.444624 (-53.138551) | 1.950449 / 6.876477 (-4.926028) | 1.988433 / 2.142072 (-0.153640) | 0.811168 / 4.805227 (-3.994059) | 0.149960 / 6.500664 (-6.350704) | 0.064845 / 0.075469 (-0.010624) |

### 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) | 1.221487 / 1.841788 (-0.620301) | 13.756534 / 8.074308 (5.682226) | 13.825369 / 10.191392 (3.633977) | 0.155641 / 0.680424 (-0.524783) | 0.028444 / 0.534201 (-0.505757) | 0.390364 / 0.579283 (-0.188919) | 0.397592 / 0.434364 (-0.036772) | 0.455905 / 0.540337 (-0.084433) | 0.534606 / 1.386936 (-0.852330) |

</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) | 0.006281 / 0.011353 (-0.005071) | 0.004533 / 0.011008 (-0.006475) | 0.098328 / 0.038508 (0.059820) | 0.026998 / 0.023109 (0.003889) | 0.424814 / 0.275898 (0.148915) | 0.457653 / 0.323480 (0.134173) | 0.004617 / 0.007986 (-0.003368) | 0.003320 / 0.004328 (-0.001009) | 0.075884 / 0.004250 (0.071634) | 0.035865 / 0.037052 (-0.001187) | 0.431674 / 0.258489 (0.173185) | 0.468286 / 0.293841 (0.174445) | 0.031915 / 0.128546 (-0.096631) | 0.011680 / 0.075646 (-0.063967) | 0.319575 / 0.419271 (-0.099696) | 0.047792 / 0.043533 (0.004259) | 0.428191 / 0.255139 (0.173052) | 0.445657 / 0.283200 (0.162458) | 0.090464 / 0.141683 (-0.051218) | 1.465480 / 1.452155 (0.013326) | 1.548985 / 1.492716 (0.056268) |

### 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) | 0.185671 / 0.018006 (0.167664) | 0.399274 / 0.000490 (0.398784) | 0.002822 / 0.000200 (0.002622) | 0.000083 / 0.000054 (0.000028) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.025934 / 0.037411 (-0.011477) | 0.099480 / 0.014526 (0.084954) | 0.110264 / 0.176557 (-0.066293) | 0.140558 / 0.737135 (-0.596577) | 0.110832 / 0.296338 (-0.185507) |

### 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) | 0.473491 / 0.215209 (0.258282) | 4.722507 / 2.077655 (2.644852) | 2.456242 / 1.504120 (0.952122) | 2.255999 / 1.541195 (0.714804) | 2.300816 / 1.468490 (0.832326) | 0.698226 / 4.584777 (-3.886551) | 3.397296 / 3.745712 (-0.348416) | 2.741674 / 5.269862 (-2.528187) | 1.462103 / 4.565676 (-3.103573) | 0.082736 / 0.424275 (-0.341539) | 0.012183 / 0.007607 (0.004576) | 0.580144 / 0.226044 (0.354099) | 5.794351 / 2.268929 (3.525422) | 2.881201 / 55.444624 (-52.563423) | 2.544384 / 6.876477 (-4.332093) | 2.555227 / 2.142072 (0.413154) | 0.805849 / 4.805227 (-3.999378) | 0.151822 / 6.500664 (-6.348842) | 0.067477 / 0.075469 (-0.007992) |

### 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) | 1.300224 / 1.841788 (-0.541564) | 13.595361 / 8.074308 (5.521053) | 13.967622 / 10.191392 (3.776230) | 0.129222 / 0.680424 (-0.551202) | 0.016939 / 0.534201 (-0.517262) | 0.375190 / 0.579283 (-0.204094) | 0.383511 / 0.434364 (-0.050853) | 0.437179 / 0.540337 (-0.103158) | 0.525674 / 1.386936 (-0.861262) |

</details>
</details>

![](https://cml.dev/watermark.png#7ed52db3d67cc8d0f2adfe53b2ec8d1124a174b8 "CML watermark")


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

PyArrow==6.0.0

<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) | 0.012364 / 0.011353 (0.001011) | 0.006098 / 0.011008 (-0.004911) | 0.158908 / 0.038508 (0.120400) | 0.039798 / 0.023109 (0.016689) | 0.383786 / 0.275898 (0.107888) | 0.533961 / 0.323480 (0.210481) | 0.012079 / 0.007986 (0.004094) | 0.006483 / 0.004328 (0.002155) | 0.109660 / 0.004250 (0.105410) | 0.048391 / 0.037052 (0.011339) | 0.447426 / 0.258489 (0.188937) | 0.477292 / 0.293841 (0.183451) | 0.066492 / 0.128546 (-0.062054) | 0.021155 / 0.075646 (-0.054492) | 0.474473 / 0.419271 (0.055202) | 0.063520 / 0.043533 (0.019987) | 0.444941 / 0.255139 (0.189802) | 0.450675 / 0.283200 (0.167475) | 0.129236 / 0.141683 (-0.012447) | 2.009362 / 1.452155 (0.557207) | 1.912067 / 1.492716 (0.419350) |

### 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) | 0.260384 / 0.018006 (0.242378) | 0.577654 / 0.000490 (0.577165) | 0.004977 / 0.000200 (0.004777) | 0.000110 / 0.000054 (0.000056) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.028101 / 0.037411 (-0.009310) | 0.161680 / 0.014526 (0.147154) | 0.146107 / 0.176557 (-0.030450) | 0.173878 / 0.737135 (-0.563257) | 0.186149 / 0.296338 (-0.110190) |

### 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) | 0.689835 / 0.215209 (0.474626) | 6.775888 / 2.077655 (4.698234) | 2.885499 / 1.504120 (1.381379) | 2.486855 / 1.541195 (0.945660) | 2.540831 / 1.468490 (1.072341) | 1.328135 / 4.584777 (-3.256642) | 5.964983 / 3.745712 (2.219271) | 3.400713 / 5.269862 (-1.869149) | 2.423257 / 4.565676 (-2.142419) | 0.129767 / 0.424275 (-0.294508) | 0.017936 / 0.007607 (0.010328) | 0.909284 / 0.226044 (0.683239) | 8.778791 / 2.268929 (6.509863) | 3.890757 / 55.444624 (-51.553867) | 3.072116 / 6.876477 (-3.804360) | 3.085390 / 2.142072 (0.943318) | 1.571710 / 4.805227 (-3.233517) | 0.279290 / 6.500664 (-6.221374) | 0.087775 / 0.075469 (0.012306) |

### 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) | 1.751223 / 1.841788 (-0.090564) | 20.313135 / 8.074308 (12.238827) | 22.793800 / 10.191392 (12.602408) | 0.296052 / 0.680424 (-0.384372) | 0.053420 / 0.534201 (-0.480781) | 0.600626 / 0.579283 (0.021343) | 0.634505 / 0.434364 (0.200142) | 0.724000 / 0.540337 (0.183663) | 0.869283 / 1.386936 (-0.517653) |

</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) | 0.014876 / 0.011353 (0.003523) | 0.008113 / 0.011008 (-0.002895) | 0.177038 / 0.038508 (0.138530) | 0.050825 / 0.023109 (0.027716) | 0.473989 / 0.275898 (0.198091) | 0.601058 / 0.323480 (0.277578) | 0.007536 / 0.007986 (-0.000450) | 0.006761 / 0.004328 (0.002432) | 0.105260 / 0.004250 (0.101010) | 0.073960 / 0.037052 (0.036908) | 0.447711 / 0.258489 (0.189222) | 0.609998 / 0.293841 (0.316157) | 0.061280 / 0.128546 (-0.067267) | 0.019370 / 0.075646 (-0.056276) | 0.510466 / 0.419271 (0.091194) | 0.062695 / 0.043533 (0.019162) | 0.436778 / 0.255139 (0.181639) | 0.489916 / 0.283200 (0.206717) | 0.137305 / 0.141683 (-0.004378) | 1.801554 / 1.452155 (0.349399) | 2.082409 / 1.492716 (0.589692) |

### 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) | 0.291304 / 0.018006 (0.273298) | 0.599041 / 0.000490 (0.598551) | 0.008017 / 0.000200 (0.007817) | 0.000127 / 0.000054 (0.000072) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.031243 / 0.037411 (-0.006169) | 0.139689 / 0.014526 (0.125163) | 0.138678 / 0.176557 (-0.037878) | 0.180458 / 0.737135 (-0.556677) | 0.149753 / 0.296338 (-0.146585) |

### 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) | 0.699692 / 0.215209 (0.484482) | 7.273327 / 2.077655 (5.195672) | 3.222650 / 1.504120 (1.718530) | 2.679424 / 1.541195 (1.138229) | 2.842378 / 1.468490 (1.373888) | 1.394633 / 4.584777 (-3.190143) | 6.379970 / 3.745712 (2.634258) | 5.944663 / 5.269862 (0.674801) | 3.105214 / 4.565676 (-1.460462) | 0.138790 / 0.424275 (-0.285485) | 0.014211 / 0.007607 (0.006604) | 0.815275 / 0.226044 (0.589230) | 8.549334 / 2.268929 (6.280405) | 3.754795 / 55.444624 (-51.689829) | 3.125222 / 6.876477 (-3.751255) | 3.269639 / 2.142072 (1.127566) | 1.464187 / 4.805227 (-3.341040) | 0.314557 / 6.500664 (-6.186107) | 0.107354 / 0.075469 (0.031885) |

### 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) | 1.480793 / 1.841788 (-0.360995) | 16.770328 / 8.074308 (8.696019) | 18.054861 / 10.191392 (7.863469) | 0.198257 / 0.680424 (-0.482167) | 0.026493 / 0.534201 (-0.507708) | 0.489701 / 0.579283 (-0.089582) | 0.540890 / 0.434364 (0.106526) | 0.566675 / 0.540337 (0.026337) | 0.661918 / 1.386936 (-0.725018) |

</details>
</details>

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