Class: Exwiw::ExplainRunner

Inherits:
Object
  • Object
show all
Defined in:
lib/exwiw/explain_runner.rb

Instance Method Summary collapse

Constructor Details

#initialize(connection_config:, config_dir:, dump_target:, logger:, io: $stdout) ⇒ ExplainRunner

Returns a new instance of ExplainRunner.



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# File 'lib/exwiw/explain_runner.rb', line 5

def initialize(
  connection_config:,
  config_dir:,
  dump_target:,
  logger:,
  io: $stdout
)
  @connection_config = connection_config
  @config_dir = config_dir
  @dump_target = dump_target
  @logger = logger
  @io = io
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/exwiw/explain_runner.rb', line 19

def run
  adapter = Adapter.build(@connection_config, @logger)
  configs = load_table_config(adapter.class.table_config_class)
  configs = reject_and_validate_skipped(configs)

  table_by_name = configs.each_with_object({}) { |config, hash| hash[config.name] = config }

  target = table_by_name[@dump_target.table_name]
  adapter.validate_as_dump_target!(target) if target

  @logger.debug("Determining table processing order...")
  ordered_table_names = DetermineTableProcessingOrder.run(configs.select { |c| adapter.dumpable?(c) })

  total_size = ordered_table_names.size
  ordered_table_names.each_with_index do |table_name, idx|
    @logger.debug("Explaining '#{table_name}'... (#{idx + 1}/#{total_size})")
    table = table_by_name.fetch(table_name)

    query_ast = adapter.build_query(table, @dump_target, table_by_name)
    sql = adapter.compile_ast(query_ast)
    explain_text = adapter.explain(query_ast)

    @io.puts "-- [#{idx + 1}/#{total_size}] #{table_name}"
    @io.puts sql
    @io.puts
    @io.puts "-- EXPLAIN:"
    @io.puts explain_text
    @io.puts
  end
end