use reifydb_core::value::column::{ColumnWithName, buffer::ColumnBuffer, columns::Columns};
use reifydb_type::value::{container::utf8::Utf8Container, r#type::Type};
use crate::routine::{Function, FunctionKind, Routine, RoutineInfo, context::FunctionContext, error::RoutineError};
pub struct TextLower {
info: RoutineInfo,
}
impl Default for TextLower {
fn default() -> Self {
Self::new()
}
}
impl TextLower {
pub fn new() -> Self {
Self {
info: RoutineInfo::new("text::lower"),
}
}
}
impl<'a> Routine<FunctionContext<'a>> for TextLower {
fn info(&self) -> &RoutineInfo {
&self.info
}
fn return_type(&self, _input_types: &[Type]) -> Type {
Type::Utf8
}
fn execute(&self, ctx: &mut FunctionContext<'a>, args: &Columns) -> Result<Columns, RoutineError> {
if args.len() != 1 {
return Err(RoutineError::FunctionArityMismatch {
function: ctx.fragment.clone(),
expected: 1,
actual: args.len(),
});
}
let column = &args[0];
let (data, bitvec) = column.unwrap_option();
let row_count = data.len();
match data {
ColumnBuffer::Utf8 {
container,
max_bytes,
} => {
let mut result_data = Vec::with_capacity(container.len());
for i in 0..row_count {
if container.is_defined(i) {
let original_str = container.get(i).unwrap();
let lower_str = original_str.to_lowercase();
result_data.push(lower_str);
} else {
result_data.push(String::new());
}
}
let result_col_data = ColumnBuffer::Utf8 {
container: Utf8Container::new(result_data),
max_bytes: *max_bytes,
};
let final_data = match bitvec {
Some(bv) => ColumnBuffer::Option {
inner: Box::new(result_col_data),
bitvec: bv.clone(),
},
None => result_col_data,
};
Ok(Columns::new(vec![ColumnWithName::new(ctx.fragment.clone(), final_data)]))
}
other => Err(RoutineError::FunctionInvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 0,
expected: vec![Type::Utf8],
actual: other.get_type(),
}),
}
}
}
impl Function for TextLower {
fn kinds(&self) -> &[FunctionKind] {
&[FunctionKind::Scalar]
}
}