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Update the document of function MutableArrayData::extend #1336

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Feb 19, 2022
Merged

Update the document of function MutableArrayData::extend #1336

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7ae6888
update document
HaoYang670 Feb 18, 2022
ac1d444
correct the fmt
HaoYang670 Feb 18, 2022
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13 changes: 10 additions & 3 deletions arrow/src/array/transform/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -614,10 +614,17 @@ impl<'a> MutableArrayData<'a> {
}
}

/// Extends this [MutableArrayData] with elements from the bounded [ArrayData] at `start`
/// and for a size of `len`.
/// Extends this array with a chunk of its source arrays
///
/// # Arguments
/// * `index` - the index of array that you what to copy values from
/// * `start` - the start index of the chunk (inclusive)
/// * `end` - the end index of the chunk (exclusive)
///
/// # Panic
/// This function panics if the range is out of bounds, i.e. if `start + len >= array.len()`.
/// This function panics if there is an invalid index,
/// i.e. `index` >= the number of source arrays
/// or `end` > the length of the `index`th array
pub fn extend(&mut self, index: usize, start: usize, end: usize) {
let len = end - start;
(self.extend_null_bits[index])(&mut self.data, start, len);
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