Double asterisks in path used by PMP was not supported by xarray

[minxu74]

PMP used double asterisks in its file paths to expand directories and files, for example, the infile: /global/cfs/projectdirs/m4931/gsharing/css03_data/CMIP6/CMIP/INM/INM-CM5-0/amip/r1i1p1f1/**/ta_*12.nc was used, then xr.open_mfdataset was used to open it. It seemed that xarray does not support it. The glob expansion is needed before the file was opened by xarray.

start and end are  1981-01   2005-12                                                                                      │
│ variable list:  ['ta']                                                                                                    │
│ ver: v20260319                                                                                                            │
│ var: ta                                                                                                                   │
│ infile: /global/cfs/projectdirs/m4931/gsharing/css03_data/CMIP6/CMIP/INM/INM-CM5-0/amip/r1i1p1f1/**/ta_*12.nc             │
│ outfile:                                                                                                                  │
│ /pscratch/sd/m/minxu/mytest_ref_2026-03-14/config/scratch/pmp/annual-cycle/09e02b3b305852e52faac1746181d4d39d223e8c/ta_IN │
│ M-CM5-0_amip_r1i1p1f1_clims.nc                                                                                            │
│ outfilename: None                                                                                                         │
│ outpath: None                                                                                                             │
│ ver: v20260319                                                                                                            │
│ infilename: ta_*12.nc                                                                                                     │
│ Traceback (most recent call last):                                                                                        │
│   File                                                                                                                    │
│ "/pscratch/sd/m/minxu/mytest_ref_2026-03-14/config/software/conda/pmp-a0cd98ec96f7c858f788439a4f0b4951fe2d7a55/bin/pcmdi_ │
│ compute_climatologies.py", line 91, in <module>                                                                           │
│     calculate_climatology(                                                                                                │
│   File                                                                                                                    │
│ "/pscratch/sd/m/minxu/mytest_ref_2026-03-14/config/software/conda/pmp-a0cd98ec96f7c858f788439a4f0b4951fe2d7a55/lib/python │
│ 3.10/site-packages/pcmdi_metrics/mean_climate/lib/calculate_climatology.py", line 33, in calculate_climatology            │
│     d = xcdat_open(infile, data_var=var)                                                                                  │
│   File                                                                                                                    │
│ "/pscratch/sd/m/minxu/mytest_ref_2026-03-14/config/software/conda/pmp-a0cd98ec96f7c858f788439a4f0b4951fe2d7a55/lib/python │
│ 3.10/site-packages/pcmdi_metrics/io/xcdat_openxml.py", line 56, in xcdat_open                                             │
│     ds = xc.open_mfdataset(                                                                                               │
│   File                                                                                                                    │
│ "/pscratch/sd/m/minxu/mytest_ref_2026-03-14/config/software/conda/pmp-a0cd98ec96f7c858f788439a4f0b4951fe2d7a55/lib/python │
│ 3.10/site-packages/xcdat/dataset.py", line 234, in open_mfdataset                                                         │
│     ds = xr.open_mfdataset(                                                                                               │
│   File                                                                                                                    │
│ "/pscratch/sd/m/minxu/mytest_ref_2026-03-14/config/software/conda/pmp-a0cd98ec96f7c858f788439a4f0b4951fe2d7a55/lib/python │
│ 3.10/site-packages/xarray/backends/api.py", line 1597, in open_mfdataset                                                  │
│     raise OSError("no files to open")                                                                                     │
│ OSError: no files to open                                                                                                 │
│                                                                                                                           │
│ stderr: None