Struct Postgres Lookup Source &nbsp; Copy item path

impl PostgresLookupSource

pub fn new( config: PostgresLookupSourceConfig, output_schema: SchemaRef, ) -> Result<Self, LookupError>

Create a new PostgreSQL lookup source.

output_schema describes the Arrow schema of each returned row. Typically derived from the table DDL or introspected at startup.

§Errors

Returns LookupError::Connection if the connection string is invalid or pool creation fails.

pub fn query_count(&self) -> u64

Returns the total number of queries executed.

pub fn row_count(&self) -> u64

Returns the total number of rows returned.

pub fn error_count(&self) -> u64

Returns the total number of query errors.

Trait Implementations§

impl LookupSource for PostgresLookupSource

async fn query( &self, keys: &[&[u8]], predicates: &[Predicate], projection: &[ColumnId], ) -> Result<Vec<Option<RecordBatch>>, LookupError>

Query the source by keys, predicates, and/or projection. Read more

fn capabilities(&self) -> LookupSourceCapabilities

Capabilities this source advertises.

fn source_name(&self) -> &str

Source name for logging and metrics.

fn schema(&self) -> SchemaRef

Arrow schema of the data this source returns.

async fn health_check(&self) -> Result<(), LookupError>

Health check. Default: always healthy.

fn estimated_row_count(&self) -> Option<u64>

Optional row count estimate for query planning.

Auto Trait Implementations§

impl !UnwindSafe for PostgresLookupSource

Blanket Implementations§

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fn layout_raw(_: <T as Pointee>::Metadata) -> Result<Layout, LayoutError>

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impl<T> LookupSourceDyn for T
where T: LookupSource,

fn query_batch<'life0, 'life1, 'life2, 'life3, 'life4, 'async_trait>( &'life0 self, keys: &'life1 [&'life2 [u8]], predicates: &'life3 [Predicate], projection: &'life4 [u32], ) -> Pin<Box<dyn Future<Output = Result<Vec<Option<RecordBatch>>, LookupError>> + Send + 'async_trait>>
where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait, 'life4: 'async_trait, T: 'async_trait,

Query the source by keys, predicates, and/or projection.

fn schema(&self) -> Arc<Schema>

Arrow schema of the data this source returns.

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