Struct ExprMappedResult 

pub struct ExprMappedResult { /* private fields */ }

Expression-based mapped result with pre-compiled projections

This struct pre-compiles all expressions during construction, providing efficient per-row evaluation through the Expression VM.

Implementations

impl ExprMappedResult

pub fn new( inner: Box<dyn QueryResult>, expressions: Vec<Expression>, output_columns: Vec<String>, ) -> Result<Self>

Create a new expression-mapped result

Arguments

• inner - The source result to project
• expressions - The projection expressions
• output_columns - Names for the output columns

Returns an error if any expression cannot be compiled.

pub fn with_context( inner: Box<dyn QueryResult>, expressions: Vec<Expression>, output_columns: Vec<String>, ctx: &ExecutionContext, ) -> Result<Self>

pub fn with_defaults( inner: Box<dyn QueryResult>, expressions: Vec<Expression>, output_columns: Vec<String>, ) -> Result<Self>

Create with default function registry (static lifetime)

Trait Implementations

impl QueryResult for ExprMappedResult

fn columns(&self) -> &[String]

Returns the column names in the result

fn next(&mut self) -> bool

Moves the cursor to the next row

fn scan(&self, dest: &mut [Value]) -> Result<()>

Scans the current row into the provided values

fn row(&self) -> &Row

Returns the current row directly without copying

fn take_row(&mut self) -> Row

Takes ownership of the current row (avoids clone)

fn close(&mut self) -> Result<()>

Closes the result set and releases resources

fn rows_affected(&self) -> i64

Returns the number of rows affected by an INSERT, UPDATE, or DELETE

fn last_insert_id(&self) -> i64

Returns the last inserted ID for an INSERT operation

fn last_error(&mut self) -> Option<Error>

Returns a pending error from the last next() call, if any.

fn with_aliases( self: Box<Self>, aliases: FxHashMap<String, String>, ) -> Box<dyn QueryResult>

Sets column aliases for this result

fn columns_arc(&self) -> Option<CompactArc<Vec<String>>>

Returns column names as Arc for zero-copy sharing

fn try_into_arc_rows(&mut self) -> Option<CompactArc<Vec<Row>>>

Try to extract all rows as CompactArc<Vec<Row>> for zero-copy joins

fn estimated_count(&self) -> Option<usize>

Returns an estimate of the total number of rows in the result.

fn supports_typed_batches(&self) -> bool

Whether the result can yield decoded typed column batches without constructing a row/value object for every result record.

fn typed_batch_fallback_reason(&self) -> Option<TypedBatchFallbackReason>

If supports_typed_batches() is false, return the best semantic reason.

fn next_typed_batch(&mut self) -> Result<Option<TypedColumnBatch>, Error>

Advance to the next typed column batch.