Class: Arrow::Table
- Inherits:
-
Object
- Object
- Arrow::Table
- Defined in:
- lib/arrow/table.rb
Class Method Summary collapse
Instance Method Summary collapse
- #each_record_batch ⇒ Object
-
#group(*keys) ⇒ Object
Experimental.
-
#initialize(*args) ⇒ Table
constructor
Creates a new Table.
- #inspect ⇒ Object
- #inspect_raw ⇒ Object
-
#merge(other) ⇒ Arrow::Table
TODO.
- #method_missing(name, *args, &block) ⇒ Object
- #pack ⇒ Object
- #remove_column(name_or_index) ⇒ Object
- #remove_column_raw ⇒ Object
- #respond_to_missing?(name, include_private) ⇒ Boolean
- #save(output, options = {}) ⇒ Object
- #slice(*args) ⇒ Object
- #slice_raw ⇒ Object
- #to_s(options = {}) ⇒ Object
- #to_s_raw ⇒ Object
-
#window(size: nil) ⇒ Object
Experimental.
Methods included from RecordContainable
Methods included from GenericTakeable
Methods included from GenericFilterable
Methods included from ColumnContainable
#[], #columns, #each_column, #find_column, #select_columns
Constructor Details
#initialize(columns) ⇒ Table #initialize(raw_table) ⇒ Table #initialize(raw_table) ⇒ Table #initialize(raw_table) ⇒ Table #initialize(schema, columns) ⇒ Table #initialize(schema, arrays) ⇒ Table #initialize(schema, record_batches) ⇒ Table #initialize(schema, raw_records) ⇒ Table
Creates a new Arrow::Table.
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# File 'lib/arrow/table.rb', line 162 def initialize(*args) n_args = args.size case n_args when 1 raw_table_converter = RawTableConverter.new(args[0]) schema = raw_table_converter.schema values = raw_table_converter.values when 2 schema = args[0] schema = Schema.new(schema) unless schema.is_a?(Schema) values = args[1] case values[0] when ::Array values = [RecordBatch.new(schema, values)] when Column values = values.collect(&:data) end else = "wrong number of arguments (given #{n_args}, expected 1..2)" raise ArgumentError, end initialize_raw(schema, values) end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(name, *args, &block) ⇒ Object
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# File 'lib/arrow/table.rb', line 479 def method_missing(name, *args, &block) if args.empty? column = find_column(name) return column if column end super end |
Class Method Details
.load(path, options = {}) ⇒ Object
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# File 'lib/arrow/table.rb', line 28 def load(path, ={}) TableLoader.load(path, ) end |
Instance Method Details
#each_record_batch ⇒ Object
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# File 'lib/arrow/table.rb', line 186 def each_record_batch return to_enum(__method__) unless block_given? reader = TableBatchReader.new(self) while record_batch = reader.read_next yield(record_batch) end end |
#group(*keys) ⇒ Object
Experimental
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# File 'lib/arrow/table.rb', line 430 def group(*keys) Group.new(self, keys) end |
#inspect ⇒ Object
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# File 'lib/arrow/table.rb', line 470 def inspect "#{super}\n#{to_s}" end |
#inspect_raw ⇒ Object
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# File 'lib/arrow/table.rb', line 469 alias_method :inspect_raw, :inspect |
#merge(other) ⇒ Arrow::Table
TODO
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# File 'lib/arrow/table.rb', line 358 def merge(other) added_columns = {} removed_columns = {} case other when Hash other.each do |name, value| name = name.to_s if value added_columns[name] = ensure_raw_column(name, value) else removed_columns[name] = true end end when Table added_columns = {} other.columns.each do |column| name = column.name added_columns[name] = ensure_raw_column(name, column) end else = "merge target must be Hash or Arrow::Table: " + "<#{other.inspect}>: #{inspect}" raise ArgumentError, end new_columns = [] columns.each do |column| column_name = column.name new_column = added_columns.delete(column_name) if new_column new_columns << new_column next end next if removed_columns.key?(column_name) new_columns << ensure_raw_column(column_name, column) end added_columns.each do |name, new_column| new_columns << new_column end new_fields = [] new_arrays = [] new_columns.each do |new_column| new_fields << new_column[:field] new_arrays << new_column[:data] end self.class.new(new_fields, new_arrays) end |
#pack ⇒ Object
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# File 'lib/arrow/table.rb', line 444 def pack packed_arrays = columns.collect do |column| column.data.pack end self.class.new(schema, packed_arrays) end |
#remove_column(name_or_index) ⇒ Object
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# File 'lib/arrow/table.rb', line 408 def remove_column(name_or_index) case name_or_index when String, Symbol name = name_or_index.to_s index = columns.index {|column| column.name == name} if index.nil? = "unknown column: #{name_or_index.inspect}: #{inspect}" raise KeyError.new() end else index = name_or_index index += n_columns if index < 0 if index < 0 or index >= n_columns = "out of index (0..#{n_columns - 1}): " + "#{name_or_index.inspect}: #{inspect}" raise IndexError.new() end end remove_column_raw(index) end |
#remove_column_raw ⇒ Object
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# File 'lib/arrow/table.rb', line 407 alias_method :remove_column_raw, :remove_column |
#respond_to_missing?(name, include_private) ⇒ Boolean
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# File 'lib/arrow/table.rb', line 474 def respond_to_missing?(name, include_private) return true if find_column(name) super end |
#save(output, options = {}) ⇒ Object
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# File 'lib/arrow/table.rb', line 439 def save(output, ={}) saver = TableSaver.new(self, output, ) saver.save end |
#slice(offset, length) ⇒ Arrow::Table #slice(index) ⇒ Arrow::Record #slice(booleans) ⇒ Arrow::Table #slice(boolean_array) ⇒ Arrow::Table #slice(range) ⇒ Arrow::Table #slice(conditions) ⇒ Arrow::Table #slice {|slicer| ... } ⇒ Arrow::Table
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# File 'lib/arrow/table.rb', line 253 def slice(*args) slicers = [] if block_given? unless args.empty? raise ArgumentError, "must not specify both arguments and block" end block_slicer = yield(Slicer.new(self)) case block_slicer when ::Array slicers.concat(block_slicer) else slicers << block_slicer end else expected_n_args = nil case args.size when 1 case args[0] when Integer index = args[0] index += n_rows if index < 0 return nil if index < 0 return nil if index >= n_rows return Record.new(self, index) when Hash condition_pairs = args[0] slicer = Slicer.new(self) conditions = [] condition_pairs.each do |key, value| case value when Range # TODO: Optimize "begin <= key <= end" case by missing "between" kernel # https://issues.apache.org/jira/browse/ARROW-9843 unless value.begin.nil? conditions << (slicer[key] >= value.begin) end unless value.end.nil? if value.exclude_end? conditions << (slicer[key] < value.end) else conditions << (slicer[key] <= value.end) end end else conditions << (slicer[key] == value) end end slicers << conditions.inject(:&) else slicers << args[0] end when 2 offset, length = args slicers << (offset...(offset + length)) else expected_n_args = "1..2" end if expected_n_args = "wrong number of arguments " + "(given #{args.size}, expected #{expected_n_args})" raise ArgumentError, end end = Arrow::FilterOptions.new .null_selection_behavior = :emit_null sliced_tables = [] slicers.each do |slicer| slicer = slicer.evaluate if slicer.respond_to?(:evaluate) case slicer when Integer slicer += n_rows if slicer < 0 sliced_tables << slice_by_range(slicer, n_rows - 1) when Range original_from = from = slicer.first to = slicer.last to -= 1 if slicer.exclude_end? from += n_rows if from < 0 if from < 0 or from >= n_rows = "offset is out of range (-#{n_rows + 1},#{n_rows}): " + "#{original_from}" raise ArgumentError, end to += n_rows if to < 0 sliced_tables << slice_by_range(from, to) when ::Array, BooleanArray, ChunkedArray sliced_tables << filter(slicer, ) else = "slicer must be Integer, Range, (from, to), " + "Arrow::ChunkedArray of Arrow::BooleanArray, " + "Arrow::BooleanArray or Arrow::Slicer::Condition: #{slicer.inspect}" raise ArgumentError, end end if sliced_tables.size > 1 sliced_tables[0].concatenate(sliced_tables[1..-1]) else sliced_tables[0] end end |
#slice_raw ⇒ Object
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# File 'lib/arrow/table.rb', line 198 alias_method :slice_raw, :slice |
#to_s(options = {}) ⇒ Object
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# File 'lib/arrow/table.rb', line 452 def to_s(={}) format = [:format] case format when :column return to_s_raw when :list formatter_class = TableListFormatter when :table, nil formatter_class = TableTableFormatter else = ":format must be :column, :list, :table or nil" raise ArgumentError, "#{}: <#{format.inspect}>" end formatter = formatter_class.new(self, ) formatter.format end |
#to_s_raw ⇒ Object
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# File 'lib/arrow/table.rb', line 451 alias_method :to_s_raw, :to_s |
#window(size: nil) ⇒ Object
Experimental
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# File 'lib/arrow/table.rb', line 435 def window(size: nil) RollingWindow.new(self, size) end |