Struct RowBatch 

pub struct RowBatch {
    pub column_names: Arc<[Arc<str>]>,
    pub column_types: Arc<[DataTypeNode]>,
    pub column_data: Vec<Vec<Value>>,
    pub num_rows: usize,
}

Available on crate feature sea-ql only.

A column-oriented batch of dynamically-typed rows.

Instead of one sea_query::Value vector per row (as in DataRow), RowBatch stores one Vec<Value> per column. This layout is efficient for columnar processing and is the natural precursor to Apache Arrow record batches.

All column_data vectors have exactly num_rows entries.

Obtain batches via crate::query::DataRowCursor::next_batch.

Example

let mut cursor = client
    .query("SELECT number, toString(number) AS s FROM system.numbers LIMIT 100")
    .fetch_rows()?;

while let Some(batch) = cursor.next_batch(32).await? {
    println!("{} rows, {} columns", batch.num_rows, batch.column_names.len());
    for (name, col) in batch.column_names.iter().zip(&batch.column_data) {
        println!("  {name}: {} values", col.len());
    }
}

Fields

column_names: Arc<[Arc<str>]>

Column names in schema order, shared with all other batches from the same query.

column_types: Arc<[DataTypeNode]>

ClickHouse data types in schema order, shared with all other batches from the same query.

column_data: Vec<Vec<Value>>

Per-column value vectors; column_data[i] holds all values for column_names[i].

Every inner Vec has exactly num_rows entries.

num_rows: usize

Number of rows in this batch.

Trait Implementations

impl Clone for RowBatch

fn clone(&self) -> RowBatch

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RowBatch

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

Formats the value using the given formatter.

impl PartialEq for RowBatch

fn eq(&self, other: &RowBatch) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for RowBatch