[Ruby] Creating a table based on an empty ChunkedArray raises exception

[stenlarsson]

Describe the bug, including details regarding any error messages, version, and platform.

In some situations we end up with an empty table. When trying to create a new table based on this it crashes. Here is the simplest example I can think of:

require 'arrow'

array = Arrow::Int64DataType.new.build_array([1])
table = Arrow::Table.new('foo' => array)
empty_table = table.filter([false])
empty_table.select_columns('foo')

This results in the following exception:

/Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:689:in `invoke': [chunked-array][combine]: Invalid: Must pass at least one array (Arrow::Error::Invalid)
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:689:in `invoke'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:560:in `combine'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/red-arrow-11.0.0/lib/arrow/chunked-array.rb:32:in `to_arrow_array'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/red-arrow-11.0.0/lib/arrow/array.rb:53:in `try_convert'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/registered-type-info.rb:31:in `try_convert'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/type-tag.rb:172:in `try_convert_interface'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/type-tag.rb:22:in `try_convert'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/type-info.rb:20:in `try_convert'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/type-tag.rb:120:in `block in try_convert_array_like'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/type-tag.rb:118:in `collect'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/type-tag.rb:118:in `try_convert_array_like'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/type-tag.rb:146:in `try_convert_array'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/type-tag.rb:22:in `try_convert'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/type-info.rb:20:in `try_convert'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:777:in `block in normalize_arguments!'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:774:in `times'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:774:in `normalize_arguments!'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:679:in `invoke'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:347:in `block (2 levels) in initialize'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:346:in `catch'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:346:in `block in initialize'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:345:in `each'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/gobject-introspection-4.1.2/lib/gobject-introspection/loader.rb:345:in `initialize'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/red-arrow-11.0.0/lib/arrow/table.rb:184:in `initialize'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/red-arrow-11.0.0/lib/arrow/column-containable.rb:102:in `new'
	from /Users/stenlarsson/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/red-arrow-11.0.0/lib/arrow/column-containable.rb:102:in `select_columns'
	from empty_table_bug.rb:6:in `<main>'

What happens here is that we end up with a ChunkedArray with no Arrays inside, and you are not allowed to call combine on it. Note that this doesn't happen if you have a ChunkedArray with one empty array.

Component(s)

Ruby

[kou]

Thanks for your report!
I've fixed this.