feat: add alias() method for DataFrame
#14127
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comphead
reviewed
Jan 14, 2025
| assert_batches_eq!(expected, &result_df.collect().await.unwrap()); | ||
| } | ||
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| #[tokio::test] |
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Thanks @jonahgao, nice PR, I would also add a test with some edge cases like nested alias, empty string alias
jonahgao
commented
Jan 15, 2025
| #[tokio::test] | ||
| async fn test_alias_empty() -> Result<()> { | ||
| let df = create_test_table("test").await?.alias("")?; | ||
| let expected = "SubqueryAlias: [a:Utf8, b:Int32]\ |
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We allow creating TableReference from empty str.
jonahgao
commented
Jan 15, 2025
| .alias("alias1")? | ||
| .alias("alias2")?; | ||
| let expected = "SubqueryAlias: alias2 [a:Utf8, b:Int32, one:Int32]\ | ||
| \n SubqueryAlias: alias1 [a:Utf8, b:Int32, one:Int32]\ |
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This layer is redundant, but SubqueryAliases won’t appear in the physical plan
comphead
approved these changes
Jan 15, 2025
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Which issue does this PR close?
Closes #14112.
Rationale for this change
The new
alias()method applies an alias to an existing DataFrame by wrapping aSubqueryAlias. It is useful for implementing self-joins.What changes are included in this PR?
Are these changes tested?
Yes
Are there any user-facing changes?
New API.