feat: add pg_catalog and its tables

datafusion-postgres-cli/src/main.rs

@@ -6,6 +6,7 @@ use datafusion::execution::options::{
     ArrowReadOptions, AvroReadOptions, CsvReadOptions, NdJsonReadOptions, ParquetReadOptions,
 };
 use datafusion::prelude::{SessionConfig, SessionContext};
+use datafusion_postgres::pg_catalog::PgCatalogSchemaProvider;
 use datafusion_postgres::{serve, ServerOptions}; // Assuming the crate name is `datafusion_postgres`
 use structopt::StructOpt;
 
@@ -169,6 +170,13 @@ async fn setup_session_context(
         println!("Loaded {} as table {}", table_path, table_name);
     }
 
+    // Register pg_catalog
+    let pg_catalog = PgCatalogSchemaProvider::new(session_context.state().catalog_list().clone());
+    session_context
+        .catalog("datafusion")
+        .unwrap()
+        .register_schema("pg_catalog", Arc::new(pg_catalog))?;
+
     Ok(())
 }
 

datafusion-postgres/src/lib.rs

@@ -1,6 +1,7 @@
 mod datatypes;
 mod encoder;
 mod handlers;
+pub mod pg_catalog;
 
 use std::sync::Arc;