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https://issues.apache.org/jira/browse/ARROW-10082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17201709#comment-17201709
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Jörn Horstmann commented on ARROW-10082:
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This was fixed during the implementation of is null/is not null kernels by
masking of bits outside the valid range
(https://github.com/apache/arrow/pull/8204/files#diff-d7b0b7cde1850e8744ceda458c6dea81)
> [Rust]: Return error on mismatching datatypes in json reader
> ------------------------------------------------------------
>
> Key: ARROW-10082
> URL: https://issues.apache.org/jira/browse/ARROW-10082
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust
> Reporter: Jörn Horstmann
> Priority: Major
>
> See
> [https://github.com/apache/arrow/blob/f358a29b35a9059c42aa8e6bcdd7a17136f14647/rust/arrow/src/json/reader.rs#L678]
>
> If the schema specifies a different datatype than what is in the file the
> value gets silently ignored. Instead we should return an error.
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