datafusion-functions-array 39.0.0

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// to you under the Apache License, Version 2.0 (the
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//   http://www.apache.org/licenses/LICENSE-2.0
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//! Array Functions for [DataFusion].
//!
//! This crate contains a collection of array functions implemented using the
//! extension API.
//!
//! [DataFusion]: https://crates.io/crates/datafusion
//!
//! You can register the functions in this crate using the [`register_all`] function.
//!

#[macro_use]
pub mod macros;

pub mod array_has;
pub mod cardinality;
pub mod concat;
pub mod dimension;
pub mod empty;
pub mod except;
pub mod expr_ext;
pub mod extract;
pub mod flatten;
pub mod length;
pub mod make_array;
pub mod position;
pub mod range;
pub mod remove;
pub mod repeat;
pub mod replace;
pub mod resize;
pub mod reverse;
pub mod rewrite;
pub mod set_ops;
pub mod sort;
pub mod string;
pub mod utils;

use datafusion_common::Result;
use datafusion_execution::FunctionRegistry;
use datafusion_expr::ScalarUDF;
use log::debug;
use std::sync::Arc;

/// Fluent-style API for creating `Expr`s
pub mod expr_fn {
    pub use super::array_has::array_has;
    pub use super::array_has::array_has_all;
    pub use super::array_has::array_has_any;
    pub use super::cardinality::cardinality;
    pub use super::concat::array_append;
    pub use super::concat::array_concat;
    pub use super::concat::array_prepend;
    pub use super::dimension::array_dims;
    pub use super::dimension::array_ndims;
    pub use super::empty::array_empty;
    pub use super::except::array_except;
    pub use super::extract::array_element;
    pub use super::extract::array_pop_back;
    pub use super::extract::array_pop_front;
    pub use super::extract::array_slice;
    pub use super::flatten::flatten;
    pub use super::length::array_length;
    pub use super::make_array::make_array;
    pub use super::position::array_position;
    pub use super::position::array_positions;
    pub use super::range::gen_series;
    pub use super::range::range;
    pub use super::remove::array_remove;
    pub use super::remove::array_remove_all;
    pub use super::remove::array_remove_n;
    pub use super::repeat::array_repeat;
    pub use super::replace::array_replace;
    pub use super::replace::array_replace_all;
    pub use super::replace::array_replace_n;
    pub use super::resize::array_resize;
    pub use super::reverse::array_reverse;
    pub use super::set_ops::array_distinct;
    pub use super::set_ops::array_intersect;
    pub use super::set_ops::array_union;
    pub use super::sort::array_sort;
    pub use super::string::array_to_string;
    pub use super::string::string_to_array;
}

/// Return all default array functions
pub fn all_default_array_functions() -> Vec<Arc<ScalarUDF>> {
    vec![
        string::array_to_string_udf(),
        string::string_to_array_udf(),
        range::range_udf(),
        range::gen_series_udf(),
        dimension::array_dims_udf(),
        cardinality::cardinality_udf(),
        dimension::array_ndims_udf(),
        concat::array_append_udf(),
        concat::array_prepend_udf(),
        concat::array_concat_udf(),
        except::array_except_udf(),
        extract::array_element_udf(),
        extract::array_pop_back_udf(),
        extract::array_pop_front_udf(),
        extract::array_slice_udf(),
        make_array::make_array_udf(),
        array_has::array_has_udf(),
        array_has::array_has_all_udf(),
        array_has::array_has_any_udf(),
        empty::array_empty_udf(),
        length::array_length_udf(),
        flatten::flatten_udf(),
        sort::array_sort_udf(),
        repeat::array_repeat_udf(),
        resize::array_resize_udf(),
        reverse::array_reverse_udf(),
        set_ops::array_distinct_udf(),
        set_ops::array_intersect_udf(),
        set_ops::array_union_udf(),
        position::array_position_udf(),
        position::array_positions_udf(),
        remove::array_remove_udf(),
        remove::array_remove_all_udf(),
        remove::array_remove_n_udf(),
        replace::array_replace_n_udf(),
        replace::array_replace_all_udf(),
        replace::array_replace_udf(),
    ]
}

/// Registers all enabled packages with a [`FunctionRegistry`]
pub fn register_all(registry: &mut dyn FunctionRegistry) -> Result<()> {
    let functions: Vec<Arc<ScalarUDF>> = all_default_array_functions();
    functions.into_iter().try_for_each(|udf| {
        let existing_udf = registry.register_udf(udf)?;
        if let Some(existing_udf) = existing_udf {
            debug!("Overwrite existing UDF: {}", existing_udf.name());
        }
        Ok(()) as Result<()>
    })?;
    registry.register_function_rewrite(Arc::new(rewrite::ArrayFunctionRewriter {}))?;

    Ok(())
}

#[cfg(test)]
mod tests {
    use crate::all_default_array_functions;
    use datafusion_common::Result;
    use std::collections::HashSet;

    #[test]
    fn test_no_duplicate_name() -> Result<()> {
        let mut names = HashSet::new();
        for func in all_default_array_functions() {
            assert!(
                names.insert(func.name().to_string().to_lowercase()),
                "duplicate function name: {}",
                func.name()
            );
            for alias in func.aliases() {
                assert!(
                    names.insert(alias.to_string().to_lowercase()),
                    "duplicate function name: {}",
                    alias
                );
            }
        }
        Ok(())
    }
}