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::{Value, r#type::Type};

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

pub struct IsType;

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

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

		if columns.len() != 2 {
			return Err(ScalarFunctionError::ArityMismatch {
				function: ctx.fragment.clone(),
				expected: 2,
				actual: columns.len(),
			});
		}

		let value_column = columns.get(0).unwrap();
		let type_column = columns.get(1).unwrap();

		// Extract target Type from second arg
		// - ColumnData::Any containing Value::Type → use that type
		// - Value::None → check for Option type
		let target_type = match type_column.data().get_value(0) {
			Value::Any(boxed) => match boxed.as_ref() {
				Value::Type(t) => t.clone(),
				_ => {
					return Err(ScalarFunctionError::InvalidArgumentType {
						function: ctx.fragment.clone(),
						argument_index: 1,
						expected: vec![Type::Any],
						actual: boxed.get_type(),
					});
				}
			},
			Value::None {
				..
			} => Type::Option(Box::new(Type::Any)),
			other => {
				return Err(ScalarFunctionError::InvalidArgumentType {
					function: ctx.fragment.clone(),
					argument_index: 1,
					expected: vec![Type::Any],
					actual: other.get_type(),
				});
			}
		};

		// Per-row type check
		let data: Vec<bool> = (0..row_count)
			.map(|i| {
				let vtype = value_column.data().get_value(i).get_type();
				if target_type == Type::Option(Box::new(Type::Any)) {
					vtype.is_option()
				} else {
					!vtype.is_option() && vtype.inner_type() == target_type.inner_type()
				}
			})
			.collect();

		Ok(ColumnData::bool(data))
	}

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