[jira] [Assigned] (ARROW-6073) [C++] Decimal128Builder is not reset in Finish()

["Antoine Pitrou (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-6073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou reassigned ARROW-6073:
-------------------------------------

    Assignee: Kenneth Jung

> [C++] Decimal128Builder is not reset in Finish()
> ------------------------------------------------
>
>                 Key: ARROW-6073
>                 URL: https://issues.apache.org/jira/browse/ARROW-6073
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 0.14.1
>            Reporter: Kenneth Jung
>            Assignee: Kenneth Jung
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 1.0.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Repro:
> {code:java|title=decimal128-builder_test.cc|borderStyle=solid}
> TEST(ArrowDecimal128BuilderTest, TestResetAfterFinish) {
>   auto type = std::make_shared<::arrow::Decimal128Type>(4, 4);
>   auto builder = std::make_shared<::arrow::Decimal128Builder>(type);
>   std::shared_ptr<::arrow::Array> out;
>   ASSERT_OK(builder->Append("1"));
>   ASSERT_OK(builder->Finish(&out));
>   ASSERT_OK(builder->Append("2"));
>   ASSERT_OK(builder->Finish(&out));
>   ASSERT_EQ(out->length(), 1);
> }
> {code}
> Output:
> {{  Expected equality of these values:}}
> {{    out->length()}}
> {{    Which is: 2}}
> {{    1}}



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