lostluck commented on a change in pull request #13013:
URL: https://github.com/apache/beam/pull/13013#discussion_r499939012
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File path: sdks/go/pkg/beam/core/runtime/exec/pardo.go
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@@ -134,40 +134,40 @@ func (n *ParDo) processMainInput(mainIn *MainInput) error
{
// If the function observes windows, we must invoke it for each window.
The expected fast path
// is that either there is a single window or the function doesn't
observes windows.
Review comment:
Consider amending the comment here making the optimization explicit.
...doesn't observe windows meaning they can be computed simultaneously as a
single window.
Mostly because processSingleWindow is very explicit at saying it's for 1
window only, which could cause this to read as a bug otherwise.
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