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QueryEngine

featherdb_query

Struct QueryEngine 

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pub struct QueryEngine { /* private fields */ }
Expand description

Query engine with optional metrics collection

Provides a high-level interface for executing queries with optional performance tracking. Wraps the parse-plan-optimize-execute pipeline.

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impl QueryEngine

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pub fn new() -> Self

Create a new query engine without metrics

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pub fn with_metrics() -> (Self, Arc<QueryMetrics>)

Create a new query engine with metrics enabled

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pub fn enable_metrics(&mut self) -> Arc<QueryMetrics>

Enable metrics collection

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pub fn disable_metrics(&mut self)

Disable metrics collection

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pub fn metrics(&self) -> Option<&Arc<QueryMetrics>>

Get reference to metrics if enabled

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pub fn execute_sql( &self, sql: &str, catalog: &Catalog, buffer_pool: &Arc<BufferPool>, snapshot: &Snapshot, txn_manager: &TransactionManager, txn_id: TransactionId, ) -> Result<QueryResult>

Execute a SQL query with full parse-plan-execute pipeline

If metrics are enabled, this will track:

  • Parse time
  • Plan time
  • Execution time
  • Rows scanned
  • Rows returned
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pub fn execute_prepared( &self, plan: &LogicalPlan, catalog: &Catalog, buffer_pool: &Arc<BufferPool>, snapshot: &Snapshot, txn_manager: &TransactionManager, txn_id: TransactionId, ) -> Result<QueryResult>

Execute a prepared statement

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impl Default for QueryEngine

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fn default() -> Self

Returns the “default value” for a type. Read more

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