Function test_form_identifier

datafusion/sql/src/expr/identifier.rs:476–522

()

    #[test]
    fn test_form_identifier() -> Result<()> {
        let err = form_identifier(&[]).expect_err("empty identifiers didn't fail");
        let expected = "Internal error: Incorrect number of identifiers: 0.\n\
         This issue was likely caused by a bug in DataFusion's code. Please help us to resolve this \
         by filing a bug report in our issue tracker: https://github.com/apache/datafusion/issues";
        assert!(expected.starts_with(&err.strip_backtrace()));

        let ids = vec!["a".to_string()];
        let (qualifier, column) = form_identifier(&ids)?;
        assert_eq!(qualifier, None);
        assert_eq!(column, "a");

        let ids = vec!["a".to_string(), "b".to_string()];
        let (qualifier, column) = form_identifier(&ids)?;
        assert_eq!(qualifier, Some(TableReference::bare("a")));
        assert_eq!(column, "b");

        let ids = vec!["a".to_string(), "b".to_string(), "c".to_string()];
        let (qualifier, column) = form_identifier(&ids)?;
        assert_eq!(qualifier, Some(TableReference::partial("a", "b")));
        assert_eq!(column, "c");

        let ids = vec![
            "a".to_string(),
            "b".to_string(),
            "c".to_string(),
            "d".to_string(),
        ];
        let (qualifier, column) = form_identifier(&ids)?;
        assert_eq!(qualifier, Some(TableReference::full("a", "b", "c")));
        assert_eq!(column, "d");

        let err = form_identifier(&[
            "a".to_string(),
            "b".to_string(),
            "c".to_string(),
            "d".to_string(),
            "e".to_string(),
        ])
        .expect_err("too many identifiers didn't fail");
        let expected = "Internal error: Incorrect number of identifiers: 5.\n\
         This issue was likely caused by a bug in DataFusion's code. Please help us to resolve this \
         by filing a bug report in our issue tracker: https://github.com/apache/datafusion/issues";
        assert!(expected.starts_with(&err.strip_backtrace()));

        Ok(())
    }
}