add upgrade sql (#197)

Author: ChuckHend

extension/sql/vectorize--0.20.0--0.21.0.sql

@@ -0,0 +1,12 @@
+CREATE  FUNCTION "hybrid_search"(
+	"job_name" TEXT, /* alloc::string::String */
+	"query" TEXT, /* alloc::string::String */
+	"api_key" TEXT DEFAULT NULL, /* core::option::Option<alloc::string::String> */
+	"return_columns" TEXT[] DEFAULT ARRAY['*']::text[], /* alloc::vec::Vec<alloc::string::String> */
+	"num_results" INT DEFAULT 10, /* i32 */
+	"where_sql" TEXT DEFAULT NULL /* core::option::Option<alloc::string::String> */
+) RETURNS TABLE (
+	"search_results" jsonb  /* pgrx::datum::json::JsonB */
+)
+LANGUAGE c /* Rust */
+AS 'MODULE_PATHNAME', 'hybrid_search_wrapper';

extension/src/api.rs

@@ -137,6 +137,9 @@ fn search(
     Ok(TableIterator::new(search_results.into_iter().map(|r| (r,))))
 }
 
+/// EXPERIMENTAL: Hybrid search
+///
+/// This function is experimental and may change in future versions.
 #[pg_extern]
 fn hybrid_search(
     job_name: String,