use reifydb_core::value::column::{Column, columns::Columns, data::ColumnData};
use reifydb_type::value::r#type::Type;
use crate::function::{Function, FunctionCapability, FunctionContext, FunctionInfo, error::FunctionError};
pub struct TextStartsWith {
info: FunctionInfo,
}
impl Default for TextStartsWith {
fn default() -> Self {
Self::new()
}
}
impl TextStartsWith {
pub fn new() -> Self {
Self {
info: FunctionInfo::new("text::starts_with"),
}
}
}
impl Function for TextStartsWith {
fn info(&self) -> &FunctionInfo {
&self.info
}
fn capabilities(&self) -> &[FunctionCapability] {
&[FunctionCapability::Scalar]
}
fn return_type(&self, _input_types: &[Type]) -> Type {
Type::Boolean
}
fn execute(&self, ctx: &FunctionContext, args: &Columns) -> Result<Columns, FunctionError> {
if args.len() != 2 {
return Err(FunctionError::ArityMismatch {
function: ctx.fragment.clone(),
expected: 2,
actual: args.len(),
});
}
let str_col = &args[0];
let prefix_col = &args[1];
let (str_data, str_bv) = str_col.data().unwrap_option();
let (prefix_data, prefix_bv) = prefix_col.data().unwrap_option();
let row_count = str_data.len();
match (str_data, prefix_data) {
(
ColumnData::Utf8 {
container: str_container,
..
},
ColumnData::Utf8 {
container: prefix_container,
..
},
) => {
let mut result_data = Vec::with_capacity(row_count);
let mut result_bitvec = Vec::with_capacity(row_count);
for i in 0..row_count {
if str_container.is_defined(i) && prefix_container.is_defined(i) {
let s = &str_container[i];
let prefix = &prefix_container[i];
result_data.push(s.starts_with(prefix.as_str()));
result_bitvec.push(true);
} else {
result_data.push(false);
result_bitvec.push(false);
}
}
let result_col_data = ColumnData::bool_with_bitvec(result_data, result_bitvec);
let combined_bv = match (str_bv, prefix_bv) {
(Some(b), Some(e)) => Some(b.and(e)),
(Some(b), None) => Some(b.clone()),
(None, Some(e)) => Some(e.clone()),
(None, None) => None,
};
let final_data = match combined_bv {
Some(bv) => ColumnData::Option {
inner: Box::new(result_col_data),
bitvec: bv,
},
None => result_col_data,
};
Ok(Columns::new(vec![Column::new(ctx.fragment.clone(), final_data)]))
}
(
ColumnData::Utf8 {
..
},
other,
) => Err(FunctionError::InvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 1,
expected: vec![Type::Utf8],
actual: other.get_type(),
}),
(other, _) => Err(FunctionError::InvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 0,
expected: vec![Type::Utf8],
actual: other.get_type(),
}),
}
}
}