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pxtrace.RetExpr
Specifies a function return value to trace.
Extracts data from the function return value, as specified by the provided expression. Traceable types are the same as in ArgExpr. Return values are accessed by index ($0 for the first return value, $1 for the second return value, etc.). In Golang, the first index value is the number of arguments, excluding the receiver. For example, the return value for fun Sum(a int, b int) int is $2. Return values that are structs may be accessed using dotted notation, similar to ArgExpr, (e.g. $0.foo).
Arguments
| Name | Type | Description |
|---|---|---|
| expr | str | The expression to evaluate. |
Returns
px.TracingField: A materialized column pointer to use in output table definitions.
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