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https://issues.apache.org/jira/browse/ARROW-9911?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Lamb resolved ARROW-9911.
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Fix Version/s: 3.0.0
Resolution: Fixed
Issue resolved by pull request 8662
[https://github.com/apache/arrow/pull/8662]
> [Rust][DataFusion] SELECT <expression> with no FROM clause should produce a
> single row of output
> ------------------------------------------------------------------------------------------------
>
> Key: ARROW-9911
> URL: https://issues.apache.org/jira/browse/ARROW-9911
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust, Rust - DataFusion
> Reporter: Andrew Lamb
> Priority: Minor
> Labels: beginner, pull-request-available
> Fix For: 3.0.0
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> This is somewhat of a special case, but it is useful for demonstration /
> testing expressions.
> A select expression with no where clause, such as "select 1" should produce a
> single row. Today datafusion accepts the query but produces no rows.
> Actual output:
> {code}
> arrow/rust$ cargo run --release --bin datafusion-cli
> Finished release [optimized] target(s) in 0.25s
> Running `target/release/datafusion-cli`
> > select 1 ;
> 0 rows in set. Query took 0 seconds.
> {code}
> Expected output is a single row, with the value 1. Here is an example using
> SQLLite :
> {code}
> $ sqlite3
> SQLite version 3.28.0 2019-04-15 14:49:49
> Enter ".help" for usage hints.
> Connected to a transient in-memory database.
> Use ".open FILENAME" to reopen on a persistent database.
> sqlite> select 1;
> 1
> sqlite>
> {code}
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