add setting to force use post.

Author: kamillecao

src/lib.rs

@@ -44,6 +44,7 @@ pub struct Client {
     database: Option<String>,
     authentication: Authentication,
     compression: Compression,
+    force_use_post: bool,
     options: HashMap<String, String>,
     headers: HashMap<String, String>,
     products_info: Vec<ProductInfo>,
@@ -98,6 +99,7 @@ impl Client {
             database: None,
             authentication: Authentication::default(),
             compression: Compression::default(),
+            force_use_post: false,
             options: HashMap::new(),
             headers: HashMap::new(),
             products_info: Vec::default(),
@@ -232,6 +234,18 @@ impl Client {
         self
     }
 
+    /// Used to specify if we use post to send request explicitly
+    ///
+    /// # Example
+    /// ```
+    /// # use clickhouse::Client;
+    /// Client::default().with_force_to_use_post(true);
+    /// ```
+    pub fn with_force_to_use_post(mut self, force_to_use_post: bool) -> Self {
+        self.force_use_post = force_to_use_post;
+        self
+    }
+
     /// Used to specify a header that will be passed to all queries.
     ///
     /// # Example

src/query.rs

@@ -155,7 +155,8 @@ impl Query {
             pairs.append_pair("database", database);
         }
 
-        let use_post = !read_only || query.len() > MAX_QUERY_LEN_TO_USE_GET;
+        let use_post =
+            !read_only || query.len() > MAX_QUERY_LEN_TO_USE_GET || self.client.force_use_post;
 
         let (method, body, content_length) = if use_post {
             if read_only {