clear bindings (#78)

* clear bindings

Change-Id: I08ef2225e365972e14839029615486f463300e57

* fix clippy error

Change-Id: I0b2bfc31eb8d8dec0e2151c84f297ba1ba022970

Author: wangfenjin

src/raw_statement.rs

@@ -11,7 +11,6 @@ use crate::error::result_from_duckdb_arrow;
 use arrow::array::{ArrayData, StructArray};
 use arrow::datatypes::{DataType, Schema, SchemaRef};
 use arrow::ffi::{ArrowArray, FFI_ArrowArray, FFI_ArrowSchema};
-use ffi::DuckDBSuccess;
 
 // Private newtype for raw sqlite3_stmts that finalize themselves when dropped.
 // TODO: destroy statement and result
@@ -66,8 +65,7 @@ impl RawStatement {
 
     #[inline]
     pub fn clear_bindings(&self) -> ffi::duckdb_state {
-        // unsafe { ffi::sqlite3_clear_bindings(self.ptr) }
-        DuckDBSuccess
+        unsafe { ffi::duckdb_clear_bindings(self.ptr) }
     }
 
     #[inline]