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1b86d90136
In Ruby 2.3 or later, `String#+@` is available and `+@` is faster than `dup`. ```ruby # frozen_string_literal: true require "bundler/inline" gemfile(true) do source "https://rubygems.org" gem "benchmark-ips" end Benchmark.ips do |x| x.report('+@') { +"" } x.report('dup') { "".dup } x.compare! end ``` ``` $ ruby -v benchmark.rb ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux] Warming up -------------------------------------- +@ 282.289k i/100ms dup 187.638k i/100ms Calculating ------------------------------------- +@ 6.775M (± 3.6%) i/s - 33.875M in 5.006253s dup 3.320M (± 2.2%) i/s - 16.700M in 5.032125s Comparison: +@: 6775299.3 i/s dup: 3320400.7 i/s - 2.04x slower ```
50 lines
1.3 KiB
Ruby
50 lines
1.3 KiB
Ruby
# frozen_string_literal: true
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require "active_record/explain_registry"
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module ActiveRecord
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module Explain
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# Executes the block with the collect flag enabled. Queries are collected
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# asynchronously by the subscriber and returned.
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def collecting_queries_for_explain # :nodoc:
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ExplainRegistry.collect = true
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yield
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ExplainRegistry.queries
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ensure
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ExplainRegistry.reset
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end
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# Makes the adapter execute EXPLAIN for the tuples of queries and bindings.
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# Returns a formatted string ready to be logged.
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def exec_explain(queries) # :nodoc:
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str = queries.map do |sql, binds|
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msg = +"EXPLAIN for: #{sql}"
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unless binds.empty?
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msg << " "
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msg << binds.map { |attr| render_bind(attr) }.inspect
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end
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msg << "\n"
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msg << connection.explain(sql, binds)
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end.join("\n")
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# Overriding inspect to be more human readable, especially in the console.
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def str.inspect
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self
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end
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str
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end
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private
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def render_bind(attr)
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value = if attr.type.binary? && attr.value
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"<#{attr.value_for_database.to_s.bytesize} bytes of binary data>"
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else
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connection.type_cast(attr.value_for_database)
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end
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[attr.name, value]
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end
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end
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end
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