Nyall Dawson 2e5257372b [FEATURE] Add order by support to expression aggregate and concatenation functions ...

Because certain aggregates and concatenation requires results in
a certain order, this change allows specific control of the order
features are added to the aggregate during an expression evaluation.

E.g.

concatenate("Station",concatenator:=',', order_by:="Station")

will give a comma separated list of station names in alphabetical
order, rather than layer feature order.

Sponsored by SMEC/SJ

2019-05-10 06:23:56 +10:00

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[FEATURE] Add order by support to expression aggregate and concatenation functions

2019-05-10 06:23:56 +10:00