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https://issues.apache.org/jira/browse/CALCITE-7840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mihai Budiu resolved CALCITE-7840.
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Fix Version/s: 1.43.0
Resolution: Fixed
Fixed in
[https://github.com/apache/calcite/commit/7cd4022a1162448bfbca14e8da7e8451a5aac4a2]
Thank you for the review [~xuzifu666]
> REAL literals should be represented with reduced precision
> ----------------------------------------------------------
>
> Key: CALCITE-7840
> URL: https://issues.apache.org/jira/browse/CALCITE-7840
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.42.0
> Reporter: Mihai Budiu
> Assignee: Mihai Budiu
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.43.0
>
>
> When casting a numeric literal to a REAL value Calcite still stores the value
> using a Java Double. That's fine, but the stored value should be first
> computed using the REAL precision, and then saved as a DOUBLE.
> This is pretty subtle. This is the result of a quidem test today:
> {code:java}
> values (cast(0.1e0 as real) = cast(0.1 as real),
> cast(cast(0.1e0 as real) as double) = cast(cast(0.1 as real) as double),
> cast(0.1e0 as real) = 0.1e0);
> +--------+--------+--------+
> | EXPR$0 | EXPR$1 | EXPR$2 |
> +--------+--------+--------+
> | false | false | true |
> +--------+--------+--------+
> (1 row) {code}
> This is the expected result:
> {code:java}
> +--------+--------+--------+
> | EXPR$0 | EXPR$1 | EXPR$2 |
> +--------+--------+--------+
> | true | true | false |
> +--------+--------+--------+ {code}
> (Postgres at least agrees with the last result, with some qualifications
> regarding how Postgres types literals)
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