use reifydb_core::value::column::data::ColumnData;
use reifydb_type::value::{constraint::bytes::MaxBytes, container::utf8::Utf8Container, r#type::Type};
use crate::function::{
ScalarFunction, ScalarFunctionContext,
error::{ScalarFunctionError, ScalarFunctionResult},
propagate_options,
};
pub struct TextRepeat;
impl TextRepeat {
pub fn new() -> Self {
Self
}
}
impl ScalarFunction for TextRepeat {
fn scalar(&self, ctx: ScalarFunctionContext) -> ScalarFunctionResult<ColumnData> {
if let Some(result) = propagate_options(self, &ctx) {
return result;
}
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 str_col = columns.get(0).unwrap();
let count_col = columns.get(1).unwrap();
match str_col.data() {
ColumnData::Utf8 {
container: str_container,
..
} => {
let mut result_data = Vec::with_capacity(row_count);
for i in 0..row_count {
if !str_container.is_defined(i) {
result_data.push(String::new());
continue;
}
let count = match count_col.data() {
ColumnData::Int1(c) => c.get(i).map(|&v| v as i64),
ColumnData::Int2(c) => c.get(i).map(|&v| v as i64),
ColumnData::Int4(c) => c.get(i).map(|&v| v as i64),
ColumnData::Int8(c) => c.get(i).copied(),
ColumnData::Uint1(c) => c.get(i).map(|&v| v as i64),
ColumnData::Uint2(c) => c.get(i).map(|&v| v as i64),
ColumnData::Uint4(c) => c.get(i).map(|&v| v as i64),
_ => {
return Err(ScalarFunctionError::InvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 1,
expected: vec![
Type::Int1,
Type::Int2,
Type::Int4,
Type::Int8,
],
actual: count_col.data().get_type(),
});
}
};
match count {
Some(n) if n >= 0 => {
let s = &str_container[i];
result_data.push(s.repeat(n as usize));
}
Some(_) => {
result_data.push(String::new());
}
None => {
result_data.push(String::new());
}
}
}
Ok(ColumnData::Utf8 {
container: Utf8Container::new(result_data),
max_bytes: MaxBytes::MAX,
})
}
other => Err(ScalarFunctionError::InvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 0,
expected: vec![Type::Utf8],
actual: other.get_type(),
}),
}
}
fn return_type(&self, _input_types: &[Type]) -> Type {
Type::Utf8
}
}