People at sohu say this setting is useful because the result of the query, rounded up with python's round function, takes three times longer than all the other commands combined.It's a question someone on StackOverflow asked.

Describe the feature

Expected behaviors:

• Flow()....needs_all() collect all hanging Pod so far, it is a sugary syntax for .needs(['h1', 'h2', ...])
• Like .needs(), .needs_all() can be used at any part of the Flow
• All other behaviors follow needs()

Hanging Pods are the pods that have no output so far.

Your proposal