Class: Presto::Client::Query

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

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(api) ⇒ Query

Returns a new instance of Query.



39
40
41
 
# File 'lib/presto/client/query.rb', line 39

def initialize(api)
  @api = api
end

Class Method Details

.start(query, options) ⇒ Object 



24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
# 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

#advance ⇒ Object 



47
48
49
 
# File 'lib/presto/client/query.rb', line 47

def advance
  @api.advance
end

#cancel ⇒ Object 



106
107
108
 
# File 'lib/presto/client/query.rb', line 106

def cancel
  @api.cancel_leaf_stage
end

#close ⇒ Object 



110
111
112
113
 
# File 'lib/presto/client/query.rb', line 110

def close
  @api.cancel_leaf_stage
  nil
end

#columns ⇒ Object 



64
65
66
67
68
69
70
 
# File 'lib/presto/client/query.rb', line 64

def columns
  wait_for_columns

  raise_if_failed

  return @api.current_results.columns
end

#current_results ⇒ Object 



43
44
45
 
# File 'lib/presto/client/query.rb', line 43

def current_results
  @api.current_results
end

#each_row(&block) ⇒ Object 



80
81
82
83
84
 
# File 'lib/presto/client/query.rb', line 80

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

#each_row_chunk(&block) ⇒ Object 



86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
 
# File 'lib/presto/client/query.rb', line 86

def each_row_chunk(&block)
  wait_for_data

  raise_if_failed

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

  begin
    if data = @api.current_results.data
      block.call(data)
    end
  end while @api.advance
end

#query_info ⇒ Object 



102
103
104
 
# File 'lib/presto/client/query.rb', line 102

def query_info
  @api.query_info
end

#raise_if_failed ⇒ Object 



115
116
117
118
119
120
121
122
123
124
125
126
 
# File 'lib/presto/client/query.rb', line 115

def raise_if_failed
  if @api.closed?
    raise PrestoClientError, "Query aborted by user"
  elsif @api.exception?
    # query is gone
    raise @api.exception
  elsif @api.query_failed?
    results = @api.current_results
    error = results.error
    raise PrestoQueryError.new("Query #{results.id} failed: #{error.message}", results.id, error.error_code, error.failure_info)
  end
end

#rows ⇒ Object 



72
73
74
75
76
77
78
 
# File 'lib/presto/client/query.rb', line 72

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