milesgranger commented on PR #14106:
URL: https://github.com/apache/arrow/pull/14106#issuecomment-1259068344
You bet, @changhiskhan, my pleasure! Below are some examples. Let me know if
you had any specific in mind. :)
`list<extension>`:
```python
import pyarrow as pa
from pyarrow.tests.test_extension_type import IntegerType
a = pa.array([[1, 2, 3]])
a.type
# ListType(list<item: int64>)
b = a.cast(pa.list_(IntegerType()))
b.type
# ListType(list<item: extension<arrow.py_extension_type<IntegerType>>>)
```
`struct<extension>`
```python
a = pa.array([{"foo": 1}])
a.type
# StructType(struct<foo: int64>)
b = a.cast(pa.struct([('foo', IntegerType())]))
b.type
# StructType(struct<foo: extension<arrow.py_extension_type<IntegerType>>>)
```
`list<struct<extension>>`
```python
a = pa.array([[{"foo": 1}]])
a.type
# ListType(list<item: struct<foo: int64>>)
b = a.cast(pa.list_(pa.struct([('foo', IntegerType())])))
b.type
# ListType(list<item: struct<foo:
extension<arrow.py_extension_type<IntegerType>>>>)
```
`struct<list<extension>>`
```python
a = pa.array([{"foo": [1, 2, 3]}])
a.type
# StructType(struct<foo: list<item: int64>>)
b = a.cast(pa.struct([('foo', pa.list_(IntegerType()))]))
b.type
# StructType(struct<foo: list<item:
extension<arrow.py_extension_type<IntegerType>>>>)
```
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