viirya commented on code in PR #3168:
URL: https://github.com/apache/arrow-rs/pull/3168#discussion_r1031219646
##########
arrow-array/src/array/string_array.rs:
##########
@@ -216,8 +216,19 @@ impl<OffsetSize: OffsetSizeTrait>
From<GenericBinaryArray<OffsetSize>>
for GenericStringArray<OffsetSize>
{
fn from(v: GenericBinaryArray<OffsetSize>) -> Self {
+ let offsets = v.value_offsets();
+ let values = v.data().buffers()[1].as_ref();
+
+ // We only need to validate that all values are valid UTF-8
+ let validated = std::str::from_utf8(values).unwrap();
+ for offset in offsets.iter() {
+ assert!(validated.is_char_boundary(offset.as_usize()))
+ }
+
let builder = v.into_data().into_builder().data_type(Self::DATA_TYPE);
- Self::from(builder.build().unwrap())
Review Comment:
Does it basically remove full validation cost?
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