Fix a couple of imports

Author: gruuya

src/context/mod.rs

@@ -205,11 +205,9 @@ impl SeafowlContext {
 
 #[cfg(test)]
 pub mod test_utils {
-    use std::sync::Arc;
-
     use crate::config::context::build_context;
     use crate::config::schema;
-    use crate::config::schema::{Catalog, SeafowlConfig, Sqlite};
+    use crate::config::schema::{Catalog, Sqlite};
     use sqlx::sqlite::SqliteJournalMode;
 
     use super::*;

src/context/physical.rs

@@ -901,7 +901,6 @@ impl SeafowlContext {
 mod tests {
     use crate::context::test_utils::in_memory_context_with_test_db;
     use datafusion::assert_batches_eq;
-    use std::sync::Arc;
 
     use super::super::test_utils::in_memory_context;
     use super::*;

src/datafusion/parser.rs

@@ -39,7 +39,6 @@ use sqlparser::{
 };
 use std::collections::{HashMap, VecDeque};
 use std::str::FromStr;
-use std::string::ToString;
 
 // Use `Parser::expected` instead, if possible
 macro_rules! parser_err {

src/wasm_udf/wasm.rs

@@ -27,9 +27,7 @@ use datafusion_expr::ColumnarValue;
 use std::sync::Arc;
 use std::vec;
 
-use rmp_serde;
 use rmp_serde::Serializer;
-use serde;
 
 use serde::Serialize;