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https://issues.apache.org/jira/browse/CALCITE-6232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17813352#comment-17813352
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Julian Hyde edited comment on CALCITE-6232 at 2/1/24 5:40 PM:
--------------------------------------------------------------
The summary is extremely unhelpful. It might as well say "Using subtraction in
LOG function does not return correct results" because LOG(5 - 5) returns -Inf.
The subtraction, or division, is not the problem. It is the handling of zero.
Apply the doctrine of the minimal test case. If the problem arises in LOG(2 /
3), does it also apply with LOG(.67) or LOG(0) or 2/ 3? Turns out that the OP
has a problem with how Calcite evaluates 2 / 3 but I am NOT going to litigate
that in a bug that is ostensibly about LOG.
This bug is closed. Open a new case that is focused on one thing.
was (Author: julianhyde):
The summary is extremely unhelpful. It might as well say "Using subtraction in
LOG function does not return correct results" because LOG(5 - 5) returns -Inf.
The subtraction, or division, is not the problem. It is the handling of zero.
> Using fractions and 0 in LOG function does not return correct results
> ---------------------------------------------------------------------
>
> Key: CALCITE-6232
> URL: https://issues.apache.org/jira/browse/CALCITE-6232
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.36.0
> Reporter: Caican Cai
> Priority: Minor
> Fix For: 1.37.0
>
>
> The correct result in mysql is as follows
> {code:java}
> mysql> SELECT LOG10(2/3) AS result;
> +---------------------+
> | result |
> +---------------------+
> | -0.1760912594899757 |
> +---------------------+
> 1 row in set (0.00 sec)
> mysql> SELECT LOG2(0) AS result;
> +--------+
> | result |
> +--------+
> | NULL |
> +--------+
> 1 row in set, 1 warning (0.01 sec)
> mysql> SELECT LOG2(2/3) AS result;
> +---------------------+
> | result |
> +---------------------+
> | -0.5849625021638512 |
> +---------------------+
> 1 row in set (0.00 sec)
>
> {code}
> The log2 and log10 results of calcite are -Infinity
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