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Size: 847 Bytes
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Stored size: 847 Bytes
Contents
module Alf
module Sql
class Processor
module JoinSupport
def on_main_exp(sexpr)
joined = apply_join_strategy(sexpr.select_exp, right.select_exp)
merge_with_exps(sexpr, right, joined)
end
alias :on_with_exp :on_main_exp
alias :on_select_exp :on_main_exp
private
def join_predicate(left, right, commons = left.to_attr_list & right.to_attr_list)
commons = left.to_attr_list & right.to_attr_list
left_d, right_d = left.desaliaser, right.desaliaser
commons.to_a.inject(tautology){|cond, attr|
left_attr, right_attr = left_d[attr], right_d[attr]
cond &= Predicate::Factory.eq(left_attr, right_attr)
}
end
end # class JoinSupport
end # class Processor
end # module Sql
end # module Alf
Version data entries
5 entries across 5 versions & 1 rubygems