1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
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
80
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
|
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
module Arrow
class RecordBatchBuilder
class << self
# @since 0.12.0
def build(schema, data)
builder = new(schema)
builder.append(data)
builder.flush
end
end
alias_method :initialize_raw, :initialize
private :initialize_raw
def initialize(schema)
unless schema.is_a?(Schema)
schema = Schema.new(schema)
end
initialize_raw(schema)
@name_to_index = {}
schema.fields.each_with_index do |field, i|
@name_to_index[field.name] = i
end
end
# @since 0.12.0
def [](name_or_index)
case name_or_index
when String, Symbol
name = name_or_index
self[resolve_name(name)]
else
index = name_or_index
column_builders[index]
end
end
# @since 0.12.0
def append(*values)
values.each do |value|
case value
when Hash
append_columns(value)
else
append_records(value)
end
end
end
# @since 0.12.0
def append_records(records)
n = n_columns
columns = n.times.collect do
[]
end
records.each_with_index do |record, nth_record|
case record
when nil
when Hash
record.each do |name, value|
nth_column = resolve_name(name)
next if nth_column.nil?
columns[nth_column] << value
end
else
record.each_with_index do |value, nth_column|
columns[nth_column] << value
end
end
columns.each do |column|
column << nil if column.size != (nth_record + 1)
end
end
columns.each_with_index do |column, i|
self[i].append(*column)
end
end
# @since 0.12.0
def append_columns(columns)
columns.each do |name, values|
self[name].append(*values)
end
end
# @since 0.13.0
def column_builders
@column_builders ||= n_columns.times.collect do |i|
get_column_builder(i)
end
end
private
def resolve_name(name)
@name_to_index[name.to_s]
end
end
end
|
