removed class query and moved their static methods to simple functions

test/backends/SequenceTest.cpp

@@ -9,35 +9,35 @@ using namespace matador::query;
 using namespace matador::test;
 
 TEST_CASE_METHOD(SequenceFixture, "test create and drop sequence", "[sequence][create][drop]") {
-  auto result = query::create()
+  auto result = create()
     .sequence("person_seq")
     .execute(db);
   REQUIRE(result.is_ok());
 
   sequences_to_drop.emplace("person_seq");
 
-  auto next_id = query::select()
+  auto next_id = select()
     .nextval("person_seq")
     .fetch_value<uint32_t>(db);
 
   REQUIRE(next_id.is_ok());
   REQUIRE(*next_id == 1);
 
-  auto curr_id = query::select()
+  auto curr_id = select()
     .currval("person_seq")
     .fetch_value<uint32_t>(db);
 
   REQUIRE(curr_id.is_ok());
   REQUIRE(*curr_id == 1);
 
-  result = query::drop()
+  result = drop()
     .sequence("person_seq")
     .execute(db);
   REQUIRE(result.is_ok());
 }
 
 TEST_CASE_METHOD(SequenceFixture, "Test nextval and currval through sequence pk generator", "[sequence][nextval][currval]") {
-  auto result = query::create()
+  auto result = create()
     .sequence("person_seq")
     .execute(db);
   REQUIRE(result.is_ok());
@@ -54,7 +54,7 @@ TEST_CASE_METHOD(SequenceFixture, "Test nextval and currval through sequence pk
   REQUIRE(pk_result.is_ok());
   REQUIRE(*pk_result == 1);
 
-  result = query::drop()
+  result = drop()
     .sequence("person_seq")
     .execute(db);
   REQUIRE(result.is_ok());