youngoli commented on a change in pull request #10991: [BEAM-3301] Refactor
DoFn validation & allow specifying main inputs.
URL: https://github.com/apache/beam/pull/10991#discussion_r388609914
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File path: sdks/go/pkg/beam/core/graph/fn.go
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@@ -209,21 +209,74 @@ func (f *DoFn) RestrictionT() *reflect.Type {
// a KV or not based on the other signatures (unless we're more loose about
which
// sideinputs are present). Bind should respect that.
+// The following constants prefixed with "Main" represent possible numbers of
+// DoFn main inputs for DoFn construction and validation. Any value not defined
+// here is an invalid number of main inputs.
+const (
+ MainUnknown = -1 // The number of main inputs is unknown for DoFn
validation.
Review comment:
I'm leaving it exported only because AsDoFn is currently exported and takes
one of these constants as an input. Making this unexported would make it
impossible to call AsDoFn with the existing behavior (unknown num. of inputs).
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