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module Arel
module Nodes
class SelectCore < Arel::Nodes::Node
attr_accessor :top, :projections, :wheres, :groups
attr_accessor :having, :source, :set_quantifier
def initialize
@source = JoinSource.new nil
@top = nil
# http://savage.net.au/SQL/sql-92.bnf.html#set%20quantifier
@set_quantifier = nil
@projections = []
@wheres = []
@groups = []
@having = nil
end
def from
@source.left
end
def from= value
@source.left = value
end
alias :froms= :from=
alias :froms :from
def initialize_copy other
super
@source = @source.clone if @source
@projections = @projections.clone
@wheres = @wheres.clone
@groups = @groups.clone
@having = @having.clone if @having
end
end
end
end
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