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Sutou KouheiYosuke Shiro
3cc12abdbac
Sutou Kouhei authored and Yosuke Shiro committed 4e51f98327d
ARROW-6240: [Ruby] Arrow::Decimal128Array#get_value returns BigDecimal

Instead of Arrow::Decimal128. This is a backward incompatible change but
it's acceptable. Because BigDecimal is easy to use than
Arrow::Decimal128 in Ruby. BigDecimal is a self-contained object. It
means that we can get expected result by #to_s without
Arrow::Decimal128DataType.

Users can still get value as Arrow::Deciaml128 by
Arrow::Decimal128Array#get_raw_value.

Closes #5089 from kou/ruby-use-bigdecimal and squashes the following commits:

e7e485321 <Sutou Kouhei>  Arrow::Decimal128Array#get_value returns BigDecimal

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Yosuke Shiro <yosuke.shiro615@gmail.com>