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https://issues.apache.org/jira/browse/IMPALA-6202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16508865#comment-16508865
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Taras Bobrovytsky commented on IMPALA-6202:
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Ideally, it would be best to fix it in my opinion. It's weird that mod() and %
do not behave identically. This could be a good ramp up task for new
contributors trying to get familiar with Impala.
> fmod and mod and % are not equivalent
> -------------------------------------
>
> Key: IMPALA-6202
> URL: https://issues.apache.org/jira/browse/IMPALA-6202
> Project: IMPALA
> Issue Type: Bug
> Components: Docs
> Affects Versions: Impala 2.11.0
> Reporter: Jim Apple
> Assignee: Alex Rodoni
> Priority: Major
>
> The docs say:
> "mod(numeric_type a, same_type b) Purpose: Returns the modulus of a number.
> Equivalent to the % arithmetic operator."
> and
> "fmod(double a, double b), fmod(float a, float b) Purpose: Returns the
> modulus of a floating-point number. Equivalent to the % arithmetic operator."
> But these can't both be true:
> {noformat}
> [localhost:21000] > select typeof(9.9 % 3), typeof(mod(9.9, 3)),
> typeof(fmod(9.9, 3));
> +-----------------+---------------------+----------------------+
> | typeof(9.9 % 3) | typeof(mod(9.9, 3)) | typeof(fmod(9.9, 3)) |
> +-----------------+---------------------+----------------------+
> | DECIMAL(2,1) | DECIMAL(4,1) | FLOAT |
> +-----------------+---------------------+----------------------+
> {noformat}
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