HaoYang670 commented on code in PR #2040:
URL: https://github.com/apache/arrow-rs/pull/2040#discussion_r917592629
##########
arrow/src/ipc/writer.rs:
##########
@@ -861,6 +863,145 @@ fn has_validity_bitmap(data_type: &DataType,
write_options: &IpcWriteOptions) ->
}
}
+/// Whether to truncate the buffer
+#[inline]
+fn buffer_need_truncate(
+ array_offset: usize,
+ buffer: &Buffer,
+ spec: &BufferSpec,
+ min_length: usize,
+) -> bool {
+ if spec == &BufferSpec::AlwaysNull {
+ false
+ } else {
+ array_offset != 0 || min_length < buffer.len()
+ }
+}
+
+/// Returns byte width for a buffer spec. Only for `BufferSpec::FixedWidth`.
+#[inline]
+fn get_buffer_byte_width(spec: &BufferSpec) -> usize {
+ match spec {
+ BufferSpec::FixedWidth { byte_width } => *byte_width,
+ _ => 0,
+ }
+}
+
+/// Returns the number of total bytes in base binary arrays.
+fn get_total_bytes(array_data: &ArrayData) -> usize {
+ if array_data.is_empty() {
+ return 0;
+ }
+ match array_data.data_type() {
+ DataType::Binary => {
+ let array: BinaryArray = array_data.clone().into();
+ let offsets = array.value_offsets();
+ (offsets[array_data.len()] - offsets[0]) as usize
Review Comment:
Is this corrent when `array_data.offset() > 0`?
##########
arrow/src/ipc/writer.rs:
##########
@@ -861,6 +863,145 @@ fn has_validity_bitmap(data_type: &DataType,
write_options: &IpcWriteOptions) ->
}
}
+/// Whether to truncate the buffer
+#[inline]
+fn buffer_need_truncate(
+ array_offset: usize,
+ buffer: &Buffer,
+ spec: &BufferSpec,
+ min_length: usize,
+) -> bool {
+ if spec == &BufferSpec::AlwaysNull {
+ false
+ } else {
+ array_offset != 0 || min_length < buffer.len()
+ }
+}
Review Comment:
nit: (not tested)
```rust
spec != &BufferSpec::AlwaysNull && (array_offset != 0 || min_length <
buffer.len())
```
##########
arrow/src/ipc/writer.rs:
##########
@@ -1507,4 +1702,60 @@ mod tests {
IpcWriteOptions::try_new(8, false, MetadataVersion::V5).unwrap(),
);
}
+
+ #[test]
+ fn truncate_ipc_record_batch() {
+ pub fn serialize(record: &RecordBatch) -> Vec<u8> {
Review Comment:
Why do we need this function to be public?
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