test: add search path test

comment: add test comment

tests/fixtures/arrow.rs

@@ -44,9 +44,12 @@ fn array_data() -> ArrayData {
 }
 
 fn single_array_data() -> ArrayData {
+    let values: [u8; 5] = *b"hello";
+    let offsets: [i32; 2] = [0, 5];
     ArrayData::builder(DataType::Binary)
         .len(1)
-        .add_buffer(Buffer::from("hello"))
+        .add_buffer(Buffer::from_slice_ref(&offsets[..]))
+        .add_buffer(Buffer::from_slice_ref(&values[..]))
         .build()
         .unwrap()
 }
@@ -75,9 +78,12 @@ fn binary_array_data() -> ArrayData {
 }
 
 fn single_binary_array_data() -> ArrayData {
-    ArrayData::builder(DataType::Binary)
+    let values: [u8; 5] = *b"hello";
+    let offsets: [i64; 2] = [0, 5];
+    ArrayData::builder(DataType::LargeBinary)
         .len(1)
-        .add_buffer(Buffer::from("hello"))
+        .add_buffer(Buffer::from_slice_ref(&offsets[..]))
+        .add_buffer(Buffer::from_slice_ref(&values[..]))
         .build()
         .unwrap()
 }
@@ -457,6 +463,20 @@ pub fn setup_local_file_listing_with_casing(local_file_path: &str, table: &str)
     )
 }
 
+pub fn setup_parquet_wrapper_and_server() -> String {
+    let create_foreign_data_wrapper = primitive_create_foreign_data_wrapper(
+        "parquet_wrapper",
+        "parquet_fdw_handler",
+        "parquet_fdw_validator",
+    );
+    let create_server = primitive_create_server("parquet_server", "parquet_wrapper");
+    format!(
+        "{create_foreign_data_wrapper};
+         {create_server};
+        "
+    )
+}
+
 fn valid(data_type: &DataType, oid: u32) -> bool {
     let oid = match PgBuiltInOids::from_u32(oid) {
         Ok(oid) => oid,

tests/scan.rs

@@ -22,7 +22,7 @@ use crate::fixtures::arrow::{
     primitive_create_table, primitive_create_user_mapping_options, primitive_record_batch,
     primitive_record_batch_single, primitive_setup_fdw_local_file_delta,
     primitive_setup_fdw_local_file_listing, primitive_setup_fdw_s3_delta,
-    primitive_setup_fdw_s3_listing,
+    primitive_setup_fdw_s3_listing, setup_parquet_wrapper_and_server,
 };
 use crate::fixtures::db::Query;
 use crate::fixtures::{conn, duckdb_conn, s3, tempdir, S3};
@@ -593,6 +593,11 @@ async fn test_prepare_stmt_execute(#[future(awt)] s3: S3, mut conn: PgConnection
     Ok(())
 }
 
+// Note: PostgreSQL will replan the query when certain catalog changes occur,
+// such as changes to the search path or when a table is deleted.
+// In contrast, DuckDB does not replan when the search path is changed.
+// If there are two foreign tables in different schemas and the prepared statements do not specify the schemas,
+// it may lead to ambiguity or errors when referencing the tables.
 #[rstest]
 async fn test_prepare_search_path(mut conn: PgConnection, tempdir: TempDir) -> Result<()> {
     let stored_batch = primitive_record_batch()?;
@@ -612,9 +617,13 @@ async fn test_prepare_search_path(mut conn: PgConnection, tempdir: TempDir) -> R
     writer.write(&stored_batch_less)?;
     writer.close()?;
 
+    // In this example, we create two tables with identical structures and names, but in different schemas.
+    // We expect that when the search path is changed, the correct table (the one in the current schema) will be referenced in DuckDB.
     "CREATE SCHEMA tpch1".execute(&mut conn);
     "CREATE SCHEMA tpch2".execute(&mut conn);
 
+    setup_parquet_wrapper_and_server().execute(&mut conn);
+
     let file_path = parquet_path.as_path().to_str().unwrap();
     let file_less_path = less_parquet_path.as_path().to_str().unwrap();
 
@@ -626,7 +635,7 @@ async fn test_prepare_search_path(mut conn: PgConnection, tempdir: TempDir) -> R
 
     "SET search_path TO tpch1".execute(&mut conn);
 
-    "PREPARE q1 AS SELECT * FROM t1 where boolean_col = $1".execute(&mut conn);
+    "PREPARE q1 AS SELECT * FROM t1 WHERE boolean_col = $1".execute(&mut conn);
 
     let result: Vec<(bool,)> = "EXECUTE q1(true)".fetch_collect(&mut conn);
     assert_eq!(result.len(), 2);