OrdinaryQueryDeclaration.optional: def of bendvy-ecs-core@0.1.0.4
Import: import bendvy-ecs-core@0.1.0.4/ordinary_query_declaration.bend as OrdinaryQueryDeclaration
Lines 150-155 of bendvy-ecs-core@0.1.0.4/ordinary_query_declaration.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.4/ordinary_query_declaration.bend&start_line=150&end_line=155

import Base
import bendvy-ecs-core@0.1.0.4/column.bend as Col
import bendvy-ecs-core@0.1.0.4/component.bend as Cmp
import bendvy-ecs-core@0.1.0.4/ordinary_declaration.bend as Identity
import bendvy-ecs-core@0.1.0.4/compose.bend as Q
import bendvy-ecs-core@0.1.0.4/capabilities.bend as Cap

# Grant read access without excluding rows where the component is absent.
# The body handles Found/ComponentAbsent/MissingEntity; optional fabricates no V.
# Stale/foreign handles yield MissingEntity and never match as live rows.
# Payload projection consumes and returns P, preserving affine ownership.
def optional(~S:Data,~P:Type,~Store:Type,~R:Type,~E:Data,~Rest:Type,~V:Data,~Token:Data,~identity:Identity.Declaration<S,P>,~view:P -> P & V,~take:Store -> Rest & Col.Column<S,P>,~put:Rest -> Col.Column<S,P> -> Store) -> Declaration<S,Q.Frame<S,Store,R,E>,Cap.Read<Q.Frame<S,Store,R,E>,V>>:
  Declaration{Q.read_family(~S,~Store,~R,~E,~Rest,~P,~V,~Token,~take,~put,~view,~Cmp.Family{Identity.key(~S,~P,identity)}),Q.family_match(~S,~Store,~R,~E,~Rest,~P,~V,~Token,~take,~put,~view,~Cmp.Family{Identity.key(~S,~P,identity)},~Q.Optional{}),[Clause{Identity.key(~S,~P,identity),Optional{}}]}

Uses (14):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/capabilities.bend&name=Read
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/column.bend&name=Column
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/component.bend&name=Family
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/compose.bend&name=Frame
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/compose.bend&name=Selection
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/compose.bend&name=family_match
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/compose.bend&name=read_family
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/ordinary_declaration.bend&name=Declaration
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/ordinary_declaration.bend&name=key
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/ordinary_query_declaration.bend&name=Clause
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/ordinary_query_declaration.bend&name=Declaration
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/ordinary_query_declaration.bend&name=Mode