reifydb-routine 0.4.5

Built-in routines (functions and procedures) for ReifyDB
Documentation 
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// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2025 ReifyDB

use reifydb_core::value::column::data::ColumnData;
use reifydb_type::value::r#type::Type;

use crate::function::{
	ScalarFunction, ScalarFunctionContext,
	error::{ScalarFunctionError, ScalarFunctionResult},
};

pub struct IsNone;

impl IsNone {
	pub fn new() -> Self {
		Self
	}
}

impl ScalarFunction for IsNone {
	fn scalar(&self, ctx: ScalarFunctionContext) -> ScalarFunctionResult<ColumnData> {
		let columns = ctx.columns;
		let row_count = ctx.row_count;

		if columns.len() != 1 {
			return Err(ScalarFunctionError::ArityMismatch {
				function: ctx.fragment.clone(),
				expected: 1,
				actual: columns.len(),
			});
		}

		let column = columns.get(0).unwrap();
		let data: Vec<bool> = (0..row_count).map(|i| !column.data().is_defined(i)).collect();

		Ok(ColumnData::bool(data))
	}

	fn return_type(&self, _input_types: &[Type]) -> Type {
		Type::Boolean
	}
}