viirya commented on code in PR #3961:
URL: https://github.com/apache/arrow-rs/pull/3961#discussion_r1149575987
##########
arrow-cast/src/cast.rs:
##########
@@ -3390,6 +3405,63 @@ fn cast_binary_to_string<O: OffsetSizeTrait>(
}
}
+/// Helper function to cast from one `BinaryArray` or 'LargeBinaryArray' to
'FixedSizeBinaryArray'.
+fn cast_binary_to_fixed_size_binary<O: OffsetSizeTrait>(
+ array: &dyn Array,
+ byte_width: i32,
+) -> Result<ArrayRef, ArrowError> {
+ let array = array
+ .as_any()
+ .downcast_ref::<GenericBinaryArray<O>>()
+ .unwrap();
+
+ let mut builder = FixedSizeBinaryBuilder::with_capacity(array.len(),
byte_width);
+
+ for i in 0..array.len() {
+ if array.is_null(i) {
+ builder.append_null();
+ } else {
+ builder.append_value(array.value(i))?;
+ }
+ }
+
+ Ok(Arc::new(builder.finish()))
+}
+
+/// Helper function to cast from 'FixedSizeBinaryArray' to one `BinaryArray`
or 'LargeBinaryArray'.
+/// If the target one is too large for the source array it will return an
Error.
+fn cast_fixed_size_binary_to_binary<O: OffsetSizeTrait>(
+ array: &dyn Array,
+ to_type: &DataType,
+ byte_width: i32,
+) -> Result<ArrayRef, ArrowError> {
+ let array = array
+ .as_any()
+ .downcast_ref::<FixedSizeBinaryArray>()
+ .unwrap();
+
+ let offsets: i64 = byte_width as i64 * array.len() as i64;
+
+ let is_binary = matches!(to_type, DataType::Binary);
+ if is_binary && offsets > i32::MAX as i64 {
+ return Err(ArrowError::ComputeError(
+ "Cast from FixedSizeBinary to Binary would overflow".to_string(),
+ ));
+ }
Review Comment:
Isn't this also used to `LargeBinaryArray`?
##########
arrow-cast/src/cast.rs:
##########
@@ -3390,6 +3405,63 @@ fn cast_binary_to_string<O: OffsetSizeTrait>(
}
}
+/// Helper function to cast from one `BinaryArray` or 'LargeBinaryArray' to
'FixedSizeBinaryArray'.
+fn cast_binary_to_fixed_size_binary<O: OffsetSizeTrait>(
+ array: &dyn Array,
+ byte_width: i32,
+) -> Result<ArrayRef, ArrowError> {
+ let array = array
+ .as_any()
+ .downcast_ref::<GenericBinaryArray<O>>()
+ .unwrap();
+
+ let mut builder = FixedSizeBinaryBuilder::with_capacity(array.len(),
byte_width);
+
+ for i in 0..array.len() {
+ if array.is_null(i) {
+ builder.append_null();
+ } else {
+ builder.append_value(array.value(i))?;
+ }
+ }
+
+ Ok(Arc::new(builder.finish()))
+}
+
+/// Helper function to cast from 'FixedSizeBinaryArray' to one `BinaryArray`
or 'LargeBinaryArray'.
+/// If the target one is too large for the source array it will return an
Error.
+fn cast_fixed_size_binary_to_binary<O: OffsetSizeTrait>(
+ array: &dyn Array,
+ to_type: &DataType,
Review Comment:
`to_type` looks redundant as it is known `GenericBinaryType<O>`.
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