Jefffrey commented on code in PR #23880:
URL: https://github.com/apache/datafusion/pull/23880#discussion_r3662030627
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datafusion/spark/src/function/string/quote.rs:
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@@ -88,34 +89,62 @@ fn spark_quote_inner(arg: &[ArrayRef]) -> Result<ArrayRef> {
fn quote_array<T: OffsetSizeTrait>(array: &ArrayRef) -> Result<ArrayRef> {
let str_array = as_generic_string_array::<T>(array)?;
- let result = str_array
- .iter()
- .map(|s| s.map(compute_quote))
- .collect::<StringArray>();
- Ok(Arc::new(result))
+ // Slicing an array keeps the whole value buffer and narrows only the
+ // offsets, so measure the data through the offsets rather than through
+ // `value_data()`.
+ let offsets = str_array.value_offsets();
+ let data_len = match (offsets.first(), offsets.last()) {
+ (Some(first), Some(last)) => last.as_usize() - first.as_usize(),
+ _ => 0,
+ };
Review Comment:
offset buffers are guaranteed to be non-empty so we can unwrap instead of
matching here
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