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-- 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.
local lgi = require 'lgi'
local Arrow = lgi.Arrow
local input_path = arg[1] or "/tmp/batch.arrow";
local input = Arrow.MemoryMappedInputStream.new(input_path)
local reader = Arrow.RecordBatchFileReader.new(input)
for i = 0, reader:get_n_record_batches() - 1 do
local record_batch = reader:read_record_batch(i)
print(string.rep("=", 40))
print("record-batch["..i.."]:")
for j = 0, record_batch:get_n_columns() - 1 do
local column_name = record_batch:get_column_name(j)
local column_data = record_batch:get_column_data(j)
io.write(" "..column_name..": [")
for k = 0, record_batch:get_n_rows() - 1 do
if k > 0 then
io.write(", ")
end
io.write(column_data:get_value(k))
end
print("]")
end
end
input:close()
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