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.