ENH: Add where argument to reduction functions that are missing it

[carlosgmartin]

Proposed new feature or change:

Mailing list post

The following reduction functions (and their nan* counterparts) receive a where argument:

• max
• min
• sum
• prod
• mean
• var
• std

Feature request: Add a where argument to the following reduction functions (and their nan* counterparts):

• ptp
• average
• median
• quantile
• percentile
• argmax
• argmin
  • ENH: Adding where for argmin #14371
  • ENH: Adding where for argmin #21625

[alessionuovo]

Extend it to create numpy query language and call it numpy_ql module I can do this