mundaym commented on a change in pull request #8011:
URL: https://github.com/apache/arrow/pull/8011#discussion_r487033507
##########
File path: go/arrow/type_traits_decimal128.go
##########
@@ -39,8 +40,13 @@ func (decimal128Traits) BytesRequired(n int) int { return
Decimal128SizeBytes *
// PutValue
func (decimal128Traits) PutValue(b []byte, v decimal128.Num) {
- binary.LittleEndian.PutUint64(b[:8], uint64(v.LowBits()))
- binary.LittleEndian.PutUint64(b[8:], uint64(v.HighBits()))
+ if runtime.GOARCH == "s390x" {
Review comment:
A simple 'endian' (or another name) package containing some files like
this might help reduce the if statement spam, and address @emkornfield's
concerns (though the compiler is pretty good at removing those branches):
big.go:
```go
// +build s390x
package endian
import "encoding/binary"
var Native = binary.BigEndian
```
little.go:
```go
// +build !s390x
package endian
import "encoding/binary"
var Native = binary.LittleEndian
```
Then you can just use `endian.Native.*` functions instead of having if
statements. Plus support for other big endian platforms becomes easy.
(Note that even though Native is a variable the methods called on it will
still be resolved at compile time because the type is constant).
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