Preparations, part 4: StorageDistributed is initialized with const Context [#CLICKHOUSE-31].

dbms/src/Storages/StorageDistributed.cpp

@@ -128,7 +128,7 @@ StorageDistributed::StorageDistributed(
     const String & remote_database_,
     const String & remote_table_,
     const String & cluster_name_,
-    Context & context_,
+    const Context & context_,
     const ASTPtr & sharding_key_,
     const String & data_path_)
     : name(name_), columns(columns_),
@@ -152,7 +152,7 @@ StorageDistributed::StorageDistributed(
     const String & remote_database_,
     const String & remote_table_,
     const String & cluster_name_,
-    Context & context_,
+    const Context & context_,
     const ASTPtr & sharding_key_,
     const String & data_path_)
     : IStorage{materialized_columns_, alias_columns_, column_defaults_},
@@ -177,7 +177,7 @@ StoragePtr StorageDistributed::create(
     const String & remote_database_,
     const String & remote_table_,
     const String & cluster_name_,
-    Context & context_,
+    const Context & context_,
     const ASTPtr & sharding_key_,
     const String & data_path_)
 {
@@ -197,7 +197,7 @@ StoragePtr StorageDistributed::create(
     const String & remote_database_,
     const String & remote_table_,
     ClusterPtr & owned_cluster_,
-    Context & context_)
+    const Context & context_)
 {
     auto res = make_shared(
         name_, columns_, remote_database_,
@@ -450,7 +450,7 @@ BlockInputStreams StorageDistributed::describe(const Context & context, const Se
 
     /** The functionality of shard_multiplexing is not completed - turn it off.
       * (Because connecting connections to different shards within a single thread is not done in parallel.)
-      * For more information, see https: //███████████.yandex-team.ru/METR-18300
+      * For more information, see https://███████████.yandex-team.ru/METR-18300
       */
     bool enable_shard_multiplexing = false;
 

dbms/src/Storages/StorageDistributed.h

@@ -41,7 +41,7 @@ public:
         const String & remote_database_,    /// database on remote servers.
         const String & remote_table_,        /// The name of the table on the remote servers.
         const String & cluster_name,
-        Context & context_,
+        const Context & context_,
         const ASTPtr & sharding_key_,
         const String & data_path_);
 
@@ -51,7 +51,7 @@ public:
         const String & remote_database_,      /// database on remote servers.
         const String & remote_table_,         /// The name of the table on the remote servers.
         ClusterPtr & owned_cluster_,
-        Context & context_);
+        const Context & context_);
 
     std::string getName() const override { return "Distributed"; }
     std::string getTableName() const override { return name; }
@@ -110,7 +110,7 @@ private:
         const String & remote_database_,
         const String & remote_table_,
         const String & cluster_name_,
-        Context & context_,
+        const Context & context_,
         const ASTPtr & sharding_key_ = nullptr,
         const String & data_path_ = String{});
 
@@ -123,7 +123,7 @@ private:
         const String & remote_database_,
         const String & remote_table_,
         const String & cluster_name_,
-        Context & context_,
+        const Context & context_,
         const ASTPtr & sharding_key_ = nullptr,
         const String & data_path_ = String{});