reifydb-engine 0.4.9

Query execution and processing engine for ReifyDB
Documentation 
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// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2025 ReifyDB

use reifydb_core::value::column::Column;
use reifydb_rql::expression::Expression;

use crate::{
	Result,
	expression::{
		cast::cast_column_data,
		compile::compile_expression,
		context::{CompileContext, EvalContext},
	},
};

pub fn evaluate(ctx: &EvalContext, expr: &Expression) -> Result<Column> {
	let compile_ctx = CompileContext {
		functions: ctx.functions,
		symbols: ctx.symbols,
	};
	let compiled = compile_expression(&compile_ctx, expr)?;
	let column = compiled.execute(ctx)?;

	// Ensures that result column data type matches the expected target column type
	if let Some(ty) = ctx.target.as_ref().map(|c| c.column_type()) {
		let data = cast_column_data(ctx, column.data(), ty, &expr.lazy_fragment())?;
		Ok(Column {
			name: column.name,
			data,
		})
	} else {
		Ok(column)
	}
}