Flexible Indexes: Avoid len(index) in map_blocks (#5670)
Flexible Indexes: Avoid len(index) in map_blocks (#5670)


markelg/xray,pydata/xarray,jhamman/xarray,pydata/xarray,jhamman/xarray,pydata/xarray,jhamman/xarray,markelg/xray,markelg/xray