alippai commented on issue #38818:
URL: https://github.com/apache/arrow/issues/38818#issuecomment-1821811099
It happens with strings only, numbers work as expected.
I little bit ugly example:
```python
pq.write_table(
pa.Table.from_arrays(
[
pc.dictionary_encode(
pa.array(np.sort(pa.array(list(range(10000)) * 1000)),
type=pa.int16())
)
],
None,
pa.schema([pa.field("a", pa.dictionary(pa.int16(), pa.utf8()),
False)]),
),
"dict.parquet",
data_page_version="2.0",
row_group_size=10000,
use_dictionary=["a"],
compression="zstd",
dictionary_pagesize_limit=100 * 1024 * 1024,
)
```
vs
```python
pq.write_table(
pa.Table.from_arrays(
[pa.array(np.sort(pa.array(list(range(10000)) * 1000)),
type=pa.int16()).cast(pa.utf8())],
None,
pa.schema([pa.field("a", pa.utf8(), False)]),
),
"nodict.parquet",
data_page_version="2.0",
row_group_size=10000,
use_dictionary=["a"],
compression="zstd",
dictionary_pagesize_limit=100*1024*1024
)
```
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