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https://issues.apache.org/jira/browse/AVRO-3904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17821026#comment-17821026
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ASF subversion and git services commented on AVRO-3904:
-------------------------------------------------------
Commit 9f4f84e0308991816948b4627ca23cbcaeb95968 in avro's branch
refs/heads/dependabot/cargo/lang/rust/env_logger-0.11.2 from Marcos Schroh
[ https://gitbox.apache.org/repos/asf?p=avro.git;h=9f4f84e03 ]
AVRO-3904: [Rust] schema_compatibility module refactor (#2742)
AVRO-3935
> [rust] Sometimes when calculating schema compatibility the code panics but
> maybe it should not
> ----------------------------------------------------------------------------------------------
>
> Key: AVRO-3904
> URL: https://issues.apache.org/jira/browse/AVRO-3904
> Project: Apache Avro
> Issue Type: Improvement
> Components: rust
> Reporter: Marcos Schroh
> Assignee: Christophe Le Saec
> Priority: Minor
> Labels: pull-request-available, rust
> Fix For: 1.12.0, 1.11.4
>
> Time Spent: 7h 20m
> Remaining Estimate: 0h
>
> When calculating the *schema compatibility can read* (schema A can read or
> not an event written using a schema B) we expect a *true* or *false* result,
> but in some cases the code *panics with a message* (reason of schema not
> being compatible) which I think it should not.
> Example:
> {code:js}
> let schema_1 = Schema::parse_str(
> r#"{
> "type": "record",
> "name": "StatisticsMap",
> "fields": [
> {"name": "success", "type": {"type": "map", "values": "int"}}
> ]
> }"#)?;
> let schema_2 = Schema::parse_str(
> r#"{
> "type": "record",
> "name": "StatisticsMap",
> "fields": [
> {"name": "success", "type": ["null", {"type": "map", "values": "int"}],
> "default": null}
> ]
> }"#)?
> assert!(SchemaCompatibility::can_read(&schema_1, &schema_2)); # true as
> expected
> assert!(SchemaCompatibility::can_read(&schema_2, &schema_1)); # expected
> result false!!
> The application panicked (crashed).
> Message: internal error: entered unreachable code: writers_schema should
> have been Schema::Map
>
> {code}
> PS: If the intention is to give feedback to end users when schemas are not
> compatible then it makes sense the panic (maybe a Result should be better?)
> but the feedback should be present every time that the result is {*}false{*},
> which is not the case.
> I have a PR ready to fix this in case that we want to change the current
> behaviour
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