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use crate::{
duckly::{
duckdb_validity_row_is_valid, duckdb_validity_set_row_invalid,
duckdb_validity_set_row_valid, duckdb_validity_set_row_validity, duckdb_vector,
duckdb_vector_assign_string_element, duckdb_vector_assign_string_element_len,
duckdb_vector_ensure_validity_writable, duckdb_vector_get_column_type,
duckdb_vector_get_data, duckdb_vector_get_validity, duckdb_vector_size, idx_t,
},
LogicalType,
};
use std::ffi::{c_char, c_void};
use std::fmt::Debug;
/// Vector of values of a specified PhysicalType.
pub struct Vector(duckdb_vector);
impl From<duckdb_vector> for Vector {
fn from(ptr: duckdb_vector) -> Self {
Self(ptr)
}
}
impl Vector {
/// Retrieves the data pointer of the vector.
///
/// The data pointer can be used to read or write values from the vector. How to read or write values depends on the type of the vector.
pub fn get_data(&self) -> *mut c_void {
unsafe { duckdb_vector_get_data(self.0) }
}
/// Assigns a string element in the vector at the specified location.
///
/// # Arguments
/// * `index` - The row position in the vector to assign the string to
/// * `str` - The string
/// * `str_len` - The length of the string (in bytes)
///
/// # Safety
pub unsafe fn assign_string_element_len(
&self,
index: idx_t,
str_: *const c_char,
str_len: idx_t,
) {
duckdb_vector_assign_string_element_len(self.0, index, str_, str_len);
}
/// Assigns a string element in the vector at the specified location.
///
/// # Arguments
/// * `index` - The row position in the vector to assign the string to
/// * `str` - The null-terminated string"]
///
/// # Safety
pub unsafe fn assign_string_element(&self, index: idx_t, str_: *const c_char) {
duckdb_vector_assign_string_element(self.0, index, str_);
}
/// Retrieves the column type of the specified vector.
pub fn get_column_type(&self) -> LogicalType {
unsafe { LogicalType::from(duckdb_vector_get_column_type(self.0)) }
}
/// Retrieves the validity mask pointer of the specified vector.
///
/// If all values are valid, this function MIGHT return NULL!
///
/// The validity mask is a bitset that signifies null-ness within the data chunk. It is a series of uint64_t values, where each uint64_t value contains validity for 64 tuples. The bit is set to 1 if the value is valid (i.e. not NULL) or 0 if the value is invalid (i.e. NULL).
///
/// Validity of a specific value can be obtained like this:
///
/// idx_t entry_idx = row_idx / 64; idx_t idx_in_entry = row_idx % 64; bool is_valid = validity_maskentry_idx & (1 << idx_in_entry);
///
/// Alternatively, the (slower) row_is_valid function can be used.
///
/// returns: The pointer to the validity mask, or NULL if no validity mask is present
pub fn get_validity(&self) -> ValidityMask {
unsafe { ValidityMask(duckdb_vector_get_validity(self.0), duckdb_vector_size()) }
}
/// Ensures the validity mask is writable by allocating it.
///
/// After this function is called, get_validity will ALWAYS return non-NULL. This allows null values to be written to the vector, regardless of whether a validity mask was present before.
pub fn ensure_validity_writable(&self) {
unsafe { duckdb_vector_ensure_validity_writable(self.0) };
}
}
pub struct ValidityMask(*mut u64, idx_t);
impl Debug for ValidityMask {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let base = (0..self.1)
.map(|row| if self.row_is_valid(row) { "." } else { "X" })
.collect::<Vec<&str>>()
.join("");
f.debug_struct("ValidityMask")
.field("validity", &base)
.finish()
}
}
impl ValidityMask {
/// Returns whether or not a row is valid (i.e. not NULL) in the given validity mask.
///
/// # Arguments
/// * `row`: The row index
/// returns: true if the row is valid, false otherwise
pub fn row_is_valid(&self, row: idx_t) -> bool {
unsafe { duckdb_validity_row_is_valid(self.0, row) }
}
/// In a validity mask, sets a specific row to either valid or invalid.
///
/// Note that ensure_validity_writable should be called before calling get_validity, to ensure that there is a validity mask to write to.
///
/// # Arguments
/// * `row`: The row index
/// * `valid`: Whether or not to set the row to valid, or invalid
pub fn set_row_validity(&self, row: idx_t, valid: bool) {
unsafe { duckdb_validity_set_row_validity(self.0, row, valid) }
}
/// In a validity mask, sets a specific row to invalid.
///
/// Equivalent to set_row_validity with valid set to false.
///
/// # Arguments
/// * `row`: The row index
pub fn set_row_invalid(&self, row: idx_t) {
unsafe { duckdb_validity_set_row_invalid(self.0, row) }
}
/// In a validity mask, sets a specific row to valid.
///
/// Equivalent to set_row_validity with valid set to true.
///
/// # Arguments
/// * `row`: The row index
pub fn set_row_valid(&self, row: idx_t) {
unsafe { duckdb_validity_set_row_valid(self.0, row) }
}
}