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https://issues.apache.org/jira/browse/AVRO-2429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16968309#comment-16968309
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ASF subversion and git services commented on AVRO-2429:
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Commit bf47ec97e0b7f5701042fac067b73b421a9177b7 in avro's branch
refs/heads/master from RyanSkraba
[ https://gitbox.apache.org/repos/asf?p=avro.git;h=bf47ec9 ]
AVRO-2429: Ignore unknown logical types in python2. (#687)
* AVRO-2429: Ignore unknown logical types in python2.
* AVRO-2429: Clean up math and unicode.
* AVRO-2429: Fix max precision formula.
If the maximum magnitude of a two's complement number of N bytes is:
max_mag(N) = 2 ** (8 * n - 1)
and the number of decimal digits required to represent M is:
decimal_digits(M) = floor(log10(M)) + 1
Then the maximum number of decimal digits that a N byte number can contain:
max_decimal_digits(N) = decimal_digits(max_mag(N))
= floor(log10(2 ** (8 * n - 1))) + 1
= floor( (8*n-1) * log10(2) ) + 1
If the biggest number has X decimal digits, the N bytes can represent all
numbers with X-1 decimal digits.
max_precision(N) = floor( (8*n-1) * log10(2) )
* AVRO-2429: Add unit tests for max precision.
Fix lint.
> Avro 1.9.0 fails when reading logical types other than "decimal"
> ----------------------------------------------------------------
>
> Key: AVRO-2429
> URL: https://issues.apache.org/jira/browse/AVRO-2429
> Project: Apache Avro
> Issue Type: Bug
> Components: python
> Affects Versions: 1.9.0
> Reporter: Chamikara Madhusanka Jayalath
> Assignee: Ryan Skraba
> Priority: Major
> Attachments: uuid.avro
>
>
> [https://github.com/apache/avro/pull/82] added support for Avro "decimal"
> logical type but also added an assertion that results in a reader failing for
> other logical types.
> [https://github.com/apache/avro/blob/master/lang/py/src/avro/schema.py#L821]
> I believe this is a regression since previously avro library used to read the
> underlying primitive type instead of failing.
> Can we revert the behavior for logical types that are not "decimal" by
> removing this assertion and reverting to the old (avro 1.8.1) behavior of
> returning the primitive type ?
>
> cc: [~Fokko] [~mtth]
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