GH39992 update inconsistent namespace usage for reductions (#40310)
GH39992 update inconsistent namespace usage for reductions (#40310)


datapythonista/pandas,rs2/pandas,gfyoung/pandas,gfyoung/pandas,rs2/pandas,jorisvandenbossche/pandas,jorisvandenbossche/pandas,dsm054/pandas,pandas-dev/pandas,pandas-dev/pandas,dsm054/pandas,dsm054/pandas,datapythonista/pandas,rs2/pandas,gfyoung/pandas,jorisvandenbossche/pandas,dsm054/pandas,pandas-dev/pandas,jorisvandenbossche/pandas,dsm054/pandas,pandas-dev/pandas,rs2/pandas,datapythonista/pandas,gfyoung/pandas,gfyoung/pandas,datapythonista/pandas