Class: ActiveDataFrame::Table

Inherits:
DataFrameProxy show all
Defined in:
lib/active_data_frame/table.rb

Instance Attribute Summary

Attributes inherited from DataFrameProxy

#block_type, #block_type_name, #data_frame_type, #plural_df_name, #singular_df_name, #value_map

Instance Method Summary collapse

Methods inherited from DataFrameProxy

#[], #[]=, #blocks_between, #clear, #column_map, #column_name_map, #database, #extract_ranges, #get_bounds, get_bounds, #initialize, iterate_bounds, #iterate_bounds, #match_range, #method_missing, #range_size, #reverse_column_map, #reverse_value_map, suppress_logs, #unmap_ranges, #verify_and_cleanse_hash_values

Constructor Details

This class inherits a constructor from ActiveDataFrame::DataFrameProxy

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class ActiveDataFrame::DataFrameProxy

Instance Method Details

#AggregateProxy(agg) ⇒ Object 



168
169
170
171
172
173
174
175
 
# File 'lib/active_data_frame/table.rb', line 168

def AggregateProxy(agg)
  proxy = Object.new
  aggregate, extract_ranges = method(:aggregate), method(:extract_ranges)
  proxy.define_singleton_method(:[]) do |*ranges|
    aggregate[extract_ranges[ranges], agg]
  end
  proxy
end

#avg ⇒ Object 



177
178
179
 
# File 'lib/active_data_frame/table.rb', line 177

def avg
  @avg ||= AggregateProxy('AVG')
end

#build_case_map(all_bounds) ⇒ Object 



14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 
# File 'lib/active_data_frame/table.rb', line 14

def build_case_map(all_bounds)
  map = block_type::COLUMNS.map{|col| [col, []]}.to_h

  all_bounds.each do |bound|
    case bound.from.index
    when bound.to.index
      (bound.from.offset+1..bound.to.offset+1).each do |col_idx|
        map["t#{col_idx}"] << (bound.from.index..bound.from.index)
      end
    else
      (bound.from.offset+1..block_type::COLUMNS.size).each do |col_idx|
        map["t#{col_idx}"] << (bound.from.index..bound.from.index)
      end
      (1..block_type::COLUMNS.size).each do |col_idx|
        map["t#{col_idx}"] << (bound.from.index.succ..bound.to.index-1)
      end if bound.from.index.succ != bound.to.index
      (1..bound.to.offset+1).each do |col_idx|
        map["t#{col_idx}"] << (bound.to.index..bound.to.index)
      end
    end
  end
  map
end

#column_cases(cases, aggregation_function = nil) ⇒ Object 



38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
 
# File 'lib/active_data_frame/table.rb', line 38

def column_cases(cases, aggregation_function=nil)
  block_type::COLUMNS.map do |col|
    col_cases = cases[col].sort_by(&:begin).reduce([]) do |agg, col_case|
      if agg.empty?
        agg << col_case
      else
        if agg[-1].end.succ == col_case.begin
          agg[-1] = (agg[-1].begin..col_case.end)
        else
          agg << col_case
        end
        agg
      end
    end

    if aggregation_function
      case col_cases.length
      when 0 then "0.0 as #{col}"
      else
        case_str = col_cases.map do |match|
          case
          when match.begin == match.end then "period_index = #{match.begin}"
          else "period_index BETWEEN #{match.begin} AND #{match.end}"
          end
        end.join(" OR ")
        "CASE WHEN #{case_str} THEN #{aggregation_function}(#{col}) ELSE NULL END"
      end
    else
      case col_cases.length
      when 0 then "NULL as #{col}"
      else
        case_str = col_cases.map do |match|
          case
          when match.begin == match.end then "period_index = #{match.begin}"
          else "period_index BETWEEN #{match.begin} AND #{match.end}"
          end
        end.join(" OR ")
        "CASE WHEN #{case_str} THEN #{col} ELSE NULL END"
      end
    end
  end.map(&Arel.method(:sql))
end

#get(ranges) ⇒ Object 



81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
 
# File 'lib/active_data_frame/table.rb', line 81

def get(ranges)
  ranges = extract_ranges(ranges)
  all_bounds = ranges.map.with_index do |range, index|
    get_bounds(range.first, range.exclude_end? ? range.end - 1 : range.end, index)
  end

  case_map  = build_case_map(all_bounds)

  existing_blocks = Hash.new{|h, index| h[index] = {}}

  index_map = {}
  res = ActiveRecord::Base.transaction do
    ids = data_frame_type.pluck(:id)
    as_sql = blocks_between(
      all_bounds,
      block_scope: data_frame_type.unscoped.where(
        "#{data_frame_type.table_name}.id IN (SELECT id FROM (#{data_frame_type.select(:id).to_sql}) airport_ids)"
      ).joins("LEFT JOIN #{block_type.table_name} ON #{data_frame_type.table_name}.id = #{block_type.table_name}.data_frame_id")
    ).where(
      block_type.table_name => {data_frame_type: data_frame_type.name }
    ).select(:period_index, :data_frame_id, *column_cases(case_map)).to_sql

    index_map = ids.each_with_index.to_h
    ActiveRecord::Base.connection.execute(as_sql)
  end

  case ActiveRecord::Base.connection_db_config.adapter
  when 'postgresql'.freeze
    res.each_row {|pi, data_frame_id, *values| existing_blocks[pi][data_frame_id] = values }
  when 'mysql2'.freeze
    res.each {|pi, data_frame_id, *values| existing_blocks[pi][data_frame_id] = values }
  when 'sqlite3'.freeze
    res.map(&:values).each {|pi, data_frame_id, *values| existing_blocks[pi][data_frame_id] = values }
  end

  result = M.blank(typecode: block_type::TYPECODE, columns: all_bounds.map(&:length).sum, rows: index_map.size)
  iterate_bounds(all_bounds) do |index, left, right, cursor, size|
    if blocks = existing_blocks[index]
      blocks.each do |data_frame_id, block|
        row = index_map[data_frame_id]
        next unless row
        chunk = block[left..right]
        result.narray[cursor...cursor + size, row] = chunk
      end
    end
  end
  if column_map && !column_map.default_proc
    total = 0
    range_sizes = ranges.map do |range, memo|
      last_total = total
      total += range.size
      [range.first, range.size, last_total]
    end
    index_of = ->(column){
      selected = range_sizes.find{|start, size| start <= column && start + size >= column}
      if selected
        start, _, total = selected
        (column - start) + total
      else
        nil
      end
    }
    result.column_map = column_map.map do |name, column|
      [name, index_of[column_map[name]]]
    end.to_h
  end
  result.row_map = Hash.new do |h ,k|
    h[k] = begin
      case k
      when ActiveRecord::Base then index_map.fetch(k.id)
      when ActiveRecord::Relation then k.pluck(:id).map{|i| index_map.fetch(i) }
      when ->(list){ list.kind_of?(Array) && list.all?{|v| v.kind_of?(ActiveRecord::Base)} } then k.map{|i| index_map.fetch(i.id) }
      when Numeric then index_map.fetch(k)
      end
    end
  end
  result
end

#idx_where_sum_gte(*ranges, max) ⇒ Object 



160
161
162
 
# File 'lib/active_data_frame/table.rb', line 160

def idx_where_sum_gte(*ranges, max)
  select_agg_indices(extract_ranges(ranges), 'SUM', ->(x, y){ x <= y } , 'SUM(%) >= :max', max: max)
end

#idx_where_sum_lte(*ranges, min) ⇒ Object 



164
165
166
 
# File 'lib/active_data_frame/table.rb', line 164

def idx_where_sum_lte(*ranges, min)
  select_agg_indices(extract_ranges(ranges), 'SUM', ->(x, y){ x >= y } , 'SUM(%) <= :min', min: min)
end

#inspect ⇒ Object 



10
11
12
 
# File 'lib/active_data_frame/table.rb', line 10

def inspect
  "#{data_frame_type.name} Table"
end

#max ⇒ Object 



185
186
187
 
# File 'lib/active_data_frame/table.rb', line 185

def max
  @max ||= AggregateProxy('MAX')
end

#min ⇒ Object 



189
190
191
 
# File 'lib/active_data_frame/table.rb', line 189

def min
  @min ||= AggregateProxy('MIN')
end

#set(from, values, trim: false) ⇒ Object 



4
5
6
7
8
 
# File 'lib/active_data_frame/table.rb', line 4

def set(from, values, trim: false)
  ActiveDataFrame::Database.batch do
    Row.set_all(data_frame_type, self.block_type, self.data_frame_type, from, values, trim: trim)
  end
end

#sum ⇒ Object 



181
182
183
 
# File 'lib/active_data_frame/table.rb', line 181

def sum
  @sum ||= AggregateProxy('SUM')
end