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https://issues.apache.org/jira/browse/AVRO-2275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16701386#comment-16701386
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ASF GitHub Bot commented on AVRO-2275:
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rstata opened a new pull request #395: AVRO-2275 Refactor schema-resolution
code from grammar-generation
URL: https://github.com/apache/avro/pull/395
Efforts to improve performance by code-generation and other means have been
hampered by the fact that our schema-resolution logic is embedded in
resolving-grammar-generation logic (see
[AVRO-2275](https://issues.apache.org/jira/browse/AVRO-2275)). This patch
factors the resolution logic out from the grammar-generation logic, so the
resolution logic can be more easily reused. See the design document included
in this patch for more information.
This patch consists of the following pieces:
* A design/user-guide document (`refactoring-resolution.md`).
* Core changes: a new file, `Resolver.java`, containing the extracted
resolution logic, and a rewrite of `ResolvingGrammarGenerator.java` based on
the new `Resolver.java`.
* Changes to resolution-related tests. These changes do not change the
tests themselves, but rather output more diagnostic information upon failure to
help developers resolve bugs.
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> Refactor schema-resolution code from grammar-generation
> -------------------------------------------------------
>
> Key: AVRO-2275
> URL: https://issues.apache.org/jira/browse/AVRO-2275
> Project: Apache Avro
> Issue Type: Improvement
> Components: java
> Reporter: Raymie Stata
> Assignee: Raymie Stata
> Priority: Major
>
> In my own work to extend AVRO-2090, and also in AVRO-2247, an alternative
> approach optimizing decoders, we were forced to re-implement Schema
> resolution logic because it's currently embedded deeply in
> ResolvingGrammarGenerator. However, in the past the Avro community found it
> hard to maintain multiple implementations of the schema resolution code, as
> it is tedious and error-prone code.
> In this JIRA we've refactored the resolution code into a new class called
> Resolver, and have rewritten ResolvingGrammarGenerator to be a client of this
> class. This rewrite passes the full regression suite, including bug-for-bug
> compatibility with a few questionable resolutions rules, such as the "soft
> matching" rule for record in unions.
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