Sha256: 6af1686e775da6bb09b58dc8bed05c62381018a80f425cca55e6c7d999471981
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Size: 1.34 KB
Versions: 6
Compression:
Stored size: 1.34 KB
Contents
module Groonga
module ExpressionRewriters
class Optimizer < ExpressionRewriter
register "optimizer"
def rewrite
codes = @expression.codes
n_codes = codes.size
# (A >= x && A < y) -> between(A, x, "include", y, "exclude")
return nil if n_codes != 7
return nil if codes[6].op != Operator::AND
return nil if codes[0].op != Operator::GET_VALUE
return nil if codes[1].op != Operator::PUSH
return nil if codes[2].op != Operator::GREATER_EQUAL
return nil if codes[3].op != Operator::GET_VALUE
return nil if codes[4].op != Operator::PUSH
return nil if codes[5].op != Operator::LESS
return nil if codes[3].value != codes[0].value
variable = @expression[0]
rewritten = Expression.create(context[variable.domain])
rewritten.append_object(Context.instance["between"], Operator::PUSH, 1)
rewritten.append_object(codes[0].value, Operator::GET_VALUE, 1)
rewritten.append_constant(codes[1].value.value, Operator::PUSH, 1)
rewritten.append_constant("include", Operator::PUSH, 1)
rewritten.append_constant(codes[4].value.value, Operator::PUSH, 1)
rewritten.append_constant("exclude", Operator::PUSH, 1)
rewritten.append_operator(Operator::CALL, 5)
rewritten
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems