Fix pyarrow to v0.9
Fix pyarrow to v0.9

nismod/smif,nismod/smif,willu47/smif,nismod/smif,willu47/smif,willu47/smif,tomalrussell/smif,tomalrussell/smif,willu47/smif,tomalrussell/smif,nismod/smif,tomalrussell/smif