Enum ColumnData 

pub enum ColumnData {
    Int64 {
        values: Arc<Vec<i64>>,
        nulls: Arc<Vec<bool>>,
    },
    Float64 {
        values: Arc<Vec<f64>>,
        nulls: Arc<Vec<bool>>,
    },
    String {
        values: Arc<Vec<Arc<str>>>,
        nulls: Arc<Vec<bool>>,
    },
    Bool {
        values: Arc<Vec<bool>>,
        nulls: Arc<Vec<bool>>,
    },
    Date {
        values: Arc<Vec<Date>>,
        nulls: Arc<Vec<bool>>,
    },
    Time {
        values: Arc<Vec<Time>>,
        nulls: Arc<Vec<bool>>,
    },
    Timestamp {
        values: Arc<Vec<Timestamp>>,
        nulls: Arc<Vec<bool>>,
    },
    Interval {
        values: Arc<Vec<Interval>>,
        nulls: Arc<Vec<bool>>,
    },
    Vector {
        values: Arc<Vec<Vec<f32>>>,
        nulls: Arc<Vec<bool>>,
    },
    Blob {
        values: Arc<Vec<Vec<u8>>>,
        nulls: Arc<Vec<bool>>,
    },
}

Typed column data with NULL bitmap

Each variant stores a vector of non-NULL values and a separate bitmap indicating which positions are NULL. This design:

• Avoids Option overhead (16 bytes vs 8 bytes for f64)
• Enables direct SIMD operations on value vectors
• Provides O(1) NULL checks via bitmap
• Uses Arc for zero-copy sharing with executor layer
• String columns use Arc for O(1) cloning

Variants

Int64

64-bit signed integers

Fields

values: Arc<Vec<i64>>

nulls: Arc<Vec<bool>>

Float64

64-bit floating point

Fields

values: Arc<Vec<f64>>

nulls: Arc<Vec<bool>>

String

Variable-length strings (using Arc for O(1) cloning)

Fields

values: Arc<Vec<Arc<str>>>

nulls: Arc<Vec<bool>>

Bool

Boolean values

Fields

values: Arc<Vec<bool>>

nulls: Arc<Vec<bool>>

Date

Date values

Fields

values: Arc<Vec<Date>>

nulls: Arc<Vec<bool>>

Time

Time values

Fields

values: Arc<Vec<Time>>

nulls: Arc<Vec<bool>>

Timestamp

Timestamp values

Fields

values: Arc<Vec<Timestamp>>

nulls: Arc<Vec<bool>>

Interval

Interval values

Fields

values: Arc<Vec<Interval>>

nulls: Arc<Vec<bool>>

Vector

Vector values (for AI/ML workloads)

Fields

values: Arc<Vec<Vec<f32>>>

nulls: Arc<Vec<bool>>

Blob

Blob values (binary data)

Fields

values: Arc<Vec<Vec<u8>>>

nulls: Arc<Vec<bool>>

Implementations

impl ColumnData

pub fn len(&self) -> usize

Get the number of values in this column (including NULLs)

pub fn is_empty(&self) -> bool

Check if the column is empty

pub fn size_in_bytes(&self) -> usize

Estimate the memory size of this column in bytes

This is used for memory budgeting in the columnar cache. The estimate includes:

• Value storage (type-specific size * element count)
• NULL bitmap (1 byte per element, not packed)
• Vec overhead (capacity, length, pointer)

pub fn is_null(&self, index: usize) -> bool

Check if the value at the given index is NULL

pub fn get(&self, index: usize) -> SqlValue

Get the SQL value at the given index (converts back to SqlValue)

pub fn as_i64_arc(&self) -> Option<(&Arc<Vec<i64>>, &Arc<Vec<bool>>)>

Get the underlying Arc for i64 values (zero-copy sharing with executor)

pub fn as_f64_arc(&self) -> Option<(&Arc<Vec<f64>>, &Arc<Vec<bool>>)>

Get the underlying Arc for f64 values (zero-copy sharing with executor)

pub fn as_string_arc(&self) -> Option<(&Arc<Vec<Arc<str>>>, &Arc<Vec<bool>>)>

Get the underlying Arc for string values (zero-copy sharing with executor)

pub fn as_bool_arc(&self) -> Option<(&Arc<Vec<bool>>, &Arc<Vec<bool>>)>

Get the underlying Arc for bool values (zero-copy sharing with executor)

pub fn as_date_arc(&self) -> Option<(&Arc<Vec<Date>>, &Arc<Vec<bool>>)>

Get the underlying Arc for date values (zero-copy sharing with executor)

pub fn as_timestamp_arc( &self, ) -> Option<(&Arc<Vec<Timestamp>>, &Arc<Vec<bool>>)>

Get the underlying Arc for timestamp values (zero-copy sharing with executor)

pub fn as_time_arc(&self) -> Option<(&Arc<Vec<Time>>, &Arc<Vec<bool>>)>

Get the underlying Arc for time values (zero-copy sharing with executor)

pub fn as_interval_arc(&self) -> Option<(&Arc<Vec<Interval>>, &Arc<Vec<bool>>)>

Get the underlying Arc for interval values (zero-copy sharing with executor)

Trait Implementations

impl Clone for ColumnData

fn clone(&self) -> ColumnData

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ColumnData

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.