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Description
Is your feature request related to a problem? Please describe.
Right now, only "index" is supported in props definition to map a prop value to a column of csv. Sometimes, this requires a lot of prework to format the csv files.
Describe the solution you'd like
Probably, we can add a "template" to allow more flexible value mapping. Say, $i refers to the i th column in the csv.
The simplest template is like below, same as "index";
props:
- name: "propname"
type: "xxxxx"
template: $i
But how about below?
tempalte: left($i, 3)
tempalte: $i + $j
tempalte: timestamp(datetime($i))
tempalte: case when $i==something then $j else $k end
You can think of more.
Basically, most of the nGQL functions and also "case when" can be supported in the templates. This will use more GraphD CPU, but the usability gain is a lot.
Describe alternatives you've considered
Additional context