francis-du opened a new issue #941:
URL: https://github.com/apache/arrow-datafusion/issues/941
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
A clear and concise description of what the problem is. Ex. I'm always
frustrated when [...]
(This section helps Arrow developers understand the context and *why* for
this feature, in addition to the *what*)
The current user who wants to preview the API of the DataFrame need to use
the `print` function to print the result without limit after the `collect`. The
printing result is very unfriendly. It is hoped that the user can print and
preview the result of the DataFrame by calling one function.
```python
import pyarrow as pa
from datafusion import ExecutionContext
ctx = ExecutionContext()
batch = pa.RecordBatch.from_arrays(
[pa.array([1, 2, 3]), pa.array([4, 5, 6])],
names=["a", "b"],
)
df = ctx.create_dataframe([[batch]])
for i in df.collect():
for j in i:
print(j)
```
Result
```
[
1,
2,
3
]
[
4,
5,
6
]
```
**Describe the solution you'd like**
A clear and concise description of what you want to happen.
Let the user call the `show` function to print and preview the results, the
user can customize the number of displayed lines, if not specified, 20 lines
will be displayed by default.
eg:
```python
import pyarrow as pa
from datafusion import ExecutionContext
ctx = ExecutionContext()
batch = pa.RecordBatch.from_arrays(
[pa.array([1, 2, 3]), pa.array([4, 5, 6])],
names=["a", "b"],
)
df = ctx.create_dataframe([[batch]])
df.show()
```
Result
```
+---+---+
| a | b |
+---+---+
| 1 | 4 |
| 2 | 5 |
| 3 | 6 |
+---+---+
```
**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features
you've considered.
**Additional context**
Add any other context or screenshots about the feature request here.
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