fix up tests and compilation (uint64 -> uint64_t)

expected/type_support.out

@@ -1,4 +1,3 @@
-drop extension if exists quack;
 create extension quack;
 -- CHAR
 CREATE TABLE chr(a CHAR);
@@ -221,6 +220,23 @@ SELECT * FROM uuid_tbl;
  00000000-0000-0000-0000-000000000000
 (3 rows)
 
+-- JSON
+CREATE TABLE json_tbl(a JSON);
+INSERT INTO json_tbl SELECT CAST(a as JSON) FROM (VALUES
+    ('{"key1": "value1", "key2": "value2"}'),
+    ('["item1", "item2", "item3"]'),
+    (NULL),
+    ('{}')
+) t(a);
+SELECT * FROM json_tbl;
+                  a                   
+--------------------------------------
+ {"key1": "value1", "key2": "value2"}
+ ["item1", "item2", "item3"]
+
+ {}
+(4 rows)
+
 DROP TABLE chr;
 DROP TABLE small;
 DROP TABLE intgr;
@@ -236,3 +252,4 @@ DROP TABLE integer_numeric;
 DROP TABLE bigint_numeric;
 DROP TABLE hugeint_numeric;
 DROP TABLE uuid_tbl;
+DROP TABLE json_tbl;

sql/type_support.sql

@@ -1,4 +1,3 @@
-drop extension if exists quack;
 create extension quack;
 
 -- CHAR

src/utility/copy.cpp

@@ -129,6 +129,6 @@ quack_copy(PlannedStmt *pstmt, const char *queryString, struct QueryEnvironment
 	}
 
 	auto chunk = res->Fetch();
-	*processed = chunk->GetValue(0, 0).GetValue<uint64>();
+	*processed = chunk->GetValue(0, 0).GetValue<uint64_t>();
 	return true;
 }