Class: Presto::Client::Query

Inherits:
Object
  • Object
show all
Defined in:
lib/presto/client/query.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(client) ⇒ Query

Returns a new instance of Query.



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# File 'lib/presto/client/query.rb', line 39

def initialize(client)
  @client = client
end

Instance Attribute Details

#client ⇒ Object (readonly)

Returns the value of attribute client.



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# File 'lib/presto/client/query.rb', line 43

def client
  @client
end

Class Method Details

.start(query, options) ⇒ Object 



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# File 'lib/presto/client/query.rb', line 24

def self.start(query, options)
  server = options[:server]
  unless server
    raise ArgumentError, ":server option is required"
  end

  faraday = Faraday.new(url: "http://#{server}") do |faraday|
    #faraday.request :url_encoded
    faraday.response :logger if options[:http_debug]
    faraday.adapter Faraday.default_adapter
  end

  new StatementClient.new(faraday, query, options)
end

Instance Method Details

#cancel ⇒ Object 



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# File 'lib/presto/client/query.rb', line 92

def cancel
  @client.cancel_leaf_stage
end

#close ⇒ Object 



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# File 'lib/presto/client/query.rb', line 96

def close
  @client.cancel_leaf_stage
  nil
end

#columns ⇒ Object 



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# File 'lib/presto/client/query.rb', line 53

def columns
  wait_for_data

  raise_error unless @client.query_succeeded?

  return @client.current_results.columns
end

#each_row(&block) ⇒ Object 



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# File 'lib/presto/client/query.rb', line 69

def each_row(&block)
  each_row_chunk {|chunk|
    chunk.each(&block)
  }
end

#each_row_chunk(&block) ⇒ Object 



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# File 'lib/presto/client/query.rb', line 75

def each_row_chunk(&block)
  wait_for_data

  raise_error unless @client.query_succeeded?

  if self.columns == nil
    raise PrestoError, "Query #{@client.current_results.id} has no columns"
  end

  begin
    if data = @client.current_results.data
      block.call(data)
    end
    @client.advance
  end while @client.has_next?
end

#rows ⇒ Object 



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# File 'lib/presto/client/query.rb', line 61

def rows
  rows = []
  each_row_chunk {|chunk|
    rows.concat(chunk)
  }
  return rows
end