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A note about positional field names (#1634)

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The inspiration comes from this question
https://stackoverflow.com/q/78908146/757714
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Andrea Borruso 2024-08-27 17:26:17 +02:00 • committed by GitHub
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docs/src/reference-dsl-variables.md
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@ -155,6 +155,10 @@ a=eks,b=wye,i=4,x=0.381399,y=0.134188
a=wye,b=pan,i=5,x=0.573288,y=0.863624
</pre>
!!! note
You can use positional field names only in `DSL` syntax, so only with the verbs `put` and `filter`.
## Out-of-stream variables
These are prefixed with an at-sign, e.g. `@sum`. Furthermore, unlike built-in variables and stream-record fields, they are maintained in an arbitrarily nested map: you can do `@sum += $quantity`, or `@sum[$color] += $quantity`, or `@sum[$color][$shape] += $quantity`. The keys for the multi-level map can be any expression which evaluates to string or integer: e.g. `@sum[NR] = $a + $b`, `@sum[$a."-".$b] = $x`, etc.