class Bmg::Sql::Processor::Merge
Public Class Methods
new(kind, all, right, builder)
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Calls superclass method
Bmg::Sql::Processor::new
# File lib/bmg/sql/processor/merge.rb, line 6 def initialize(kind, all, right, builder) super(builder) @kind = kind @all = all @right = right end
Public Instance Methods
on_nonjoin_exp(sexpr)
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# File lib/bmg/sql/processor/merge.rb, line 25 def on_nonjoin_exp(sexpr) left_attrs = sexpr.to_attr_list.map(&:to_s).sort right_attrs = @right.to_attr_list.map(&:to_s).sort unless left_attrs == right_attrs raise "Operands are not union compatible: #{left_attrs.inspect} vs. #{right_attrs.inspect}" end reordered = Reorder.new(sexpr.to_attr_list, builder).call(@right) if @right.with_exp? [ :with_exp, reordered.with_spec, [ @kind, modifier, sexpr, reordered.select_exp ] ] elsif sexpr.first == @kind && sexpr.set_quantifier == modifier sexpr.dup + [ reordered ] else [ @kind, modifier, sexpr, reordered ] end end
on_with_exp(sexpr)
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# File lib/bmg/sql/processor/merge.rb, line 13 def on_with_exp(sexpr) if @right.with_exp? reordered = Reorder.new(sexpr.to_attr_list, builder).call(@right) main = [ @kind, modifier, sexpr.select_exp, reordered.select_exp ] merge_with_exps(sexpr, reordered, main) else [ :with_exp, sexpr.with_spec, apply(sexpr.last) ] end end
Private Instance Methods
modifier()
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# File lib/bmg/sql/processor/merge.rb, line 50 def modifier @all ? builder.all : builder.distinct end