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https://issues.apache.org/jira/browse/DRILL-2546?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rahul Challapalli closed DRILL-2546.
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Thanks for the clarification Mehant!
> Implicit Cast : Joining 2 tables on columns which are float and double should
> succeed when the values are equal
> ---------------------------------------------------------------------------------------------------------------
>
> Key: DRILL-2546
> URL: https://issues.apache.org/jira/browse/DRILL-2546
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Data Types, Execution - Relational Operators
> Reporter: Rahul Challapalli
> Assignee: Mehant Baid
> Fix For: 0.9.0
>
> Attachments: fewtypes_null.json, fewtypes_null.parquet
>
>
> git.commit.id.abbrev=f1b59ed
> I attached 2 files which contains the same values.
> The below query is not doing an implicit cast between double and float
> {code}
> select count(*) from dfs.`cross-sources`.`fewtypes_null.parquet` p
> . . . . . . . . . . . . . . > inner join
> dfs.`cross-sources`.`fewtypes_null.json` o
> . . . . . . . . . . . . . . > on p.float_col=o.float_col;
> +------------+
> | EXPR$0 |
> +------------+
> | 1 |
> +------------+
> 1 row selected (0.148 seconds)
> {code}
> However if we do an explicit cast, we get the right result
> {code}
> select count(*) from dfs.`cross-sources`.`fewtypes_null.parquet` p
> . . . . . . . . . . . . . . > inner join
> dfs.`cross-sources`.`fewtypes_null.json` o
> . . . . . . . . . . . . . . > on p.float_col=cast(o.float_col as float);
> +------------+
> | EXPR$0 |
> +------------+
> | 17 |
> +------------+
> {code}
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