Struct LocalEngine 

pub struct LocalEngine { /* private fields */ }

Local DuckDB engine wrapper for the HatiData CLI.

Implementations

impl LocalEngine

pub fn open(path: &Path) -> Result<Self>

Open (or create) a DuckDB database at the given path.

pub fn execute_query(&self, sql: &str) -> Result<QueryResult>

Execute a SQL query and return structured results.

IMPORTANT DuckDB 1.4.4 API note: column_count() and column_name() panic if called before the statement is executed. We must execute first (via query), then read column metadata.

Uses duckdb::types::Value for reading cell values to handle all types correctly (the DuckDB Rust API’s row.get::<_, String>(i) fails for non-String types).

pub fn list_tables(&self) -> Result<Vec<TableInfo>>

List all user tables in the database.

pub fn table_row_count(&self, table: &str) -> Result<u64>

Get the row count for a specific table.

pub fn export_table_parquet(&self, table: &str, output: &Path) -> Result<()>

Export a table to a Parquet file.