withSelect

"withSelect": true

This property allows returning values calculated on the fly from other infoj entries.

Consider the example below:

{
"label": "Population",
"field": "pop__17", // known value
"type": "numeric"
},
{
"label": "Competitors",
"field": "comp", // known value
"type": "integer"
},
{
"label": "Population per competitor",
"field": "field_withSelect", // PostgreSQL calculation result alias
"fieldfx": "pop__17 / comp", // calcutation to perform
"type": "integer",
"withSelect": true
}

Each feature on this layer calculates "Population per competitor" ratio of two given values when requested.

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When used with cross layer queries (i.e. lookups) returns result with along with defined spatial condition.