timsaucer opened a new pull request, #1215:
URL: https://github.com/apache/datafusion-python/pull/1215
# Which issue does this PR close?
This is a user request but no issue was opened.
# Rationale for this change
With this you can do slicing of arrays via expression. For example, suppose
you have this data frame:
```
+----------------------+
| a |
+----------------------+
| [1.0, 2.0, 3.0, 3.0] |
| [4.0, 5.0, 3.0] |
| [6.0] |
+----------------------+
```
You could do `df.with_column("a[1:3]", column("a")[1:3])` to get
```
+----------------------+------------+
| a | a[1:3] |
+----------------------+------------+
| [1.0, 2.0, 3.0, 3.0] | [2.0, 3.0] |
| [4.0, 5.0, 3.0] | [5.0, 3.0] |
| [6.0] | [] |
+----------------------+------------+
```
# What changes are included in this PR?
Updates `__getitem__` to take slice.
Adds unit tests.
# Are there any user-facing changes?
No
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