revert: changes for gcs introduction

src/main.rs

@@ -15,7 +15,7 @@ mod object_store_util;
 use crate::args::Args;
 
 use object_store_opendal::OpendalStore;
-use opendal::services::{Gcs, S3};
+use opendal::services::S3;
 use opendal::Operator;
 use url::Url;
 
@@ -36,15 +36,6 @@ fn init_s3_operator_via_builder(url: &Url) -> Result<Operator> {
     Ok(op)
 }
 
-fn init_gcs_operator_via_builder(url: &Url) -> Result<Operator> {
-    let mut builder = Gcs::default();
-
-    let op = Operator::new(builder)
-        .map_err(|e| DataFusionError::Execution(format!("Failed to build operator: {e}")))?
-        .finish();
-    Ok(op)
-}
-
 #[tokio::main]
 async fn main() -> Result<()> {
     let config = SessionConfig::new().with_information_schema(true);