Basic ClickHouse HTTP query wrapper (#8)

* Basic ClickHouse http query macro wrapper

Author: lmangani

CMakeLists.txt

@@ -14,7 +14,7 @@ set(LOADABLE_EXTENSION_NAME ${TARGET_NAME}_loadable_extension)
 project(${TARGET_NAME})
 include_directories(src/include)
 
-set(EXTENSION_SOURCES src/chsql_extension.cpp src/default_table_functions.cpp)
+set(EXTENSION_SOURCES src/chsql_extension.cpp)
 
 build_static_extension(${TARGET_NAME} ${EXTENSION_SOURCES})
 build_loadable_extension(${TARGET_NAME} " " ${EXTENSION_SOURCES})

src/chsql_extension.cpp

@@ -143,7 +143,8 @@ static DefaultMacro chsql_macros[] = {
 static const DefaultTableMacro chsql_table_macros[] = {
 	{DEFAULT_SCHEMA, "tableMultiply", {"x", nullptr}, {{"two", "2"}, {nullptr, nullptr}},  R"(SELECT x * two as output_column;)"},
         {DEFAULT_SCHEMA, "numbers", {"x", nullptr}, {{"z", "0"}, {nullptr, nullptr}},  R"(SELECT * as number FROM generate_series(z,x-1);)"},
-	{nullptr, nullptr, {nullptr}, {{nullptr, nullptr}}, nullptr}
+        {DEFAULT_SCHEMA, "ch_scan", {"query", "server"}, {{"format", "JSONEachRow"}, {"user", "play"}, {nullptr, nullptr}},  R"(SELECT * FROM read_json_auto(concat(server, '/?default_format=', format, '&user=', user, '&query=', query)))"},
+        {nullptr, nullptr, {nullptr}, {{nullptr, nullptr}}, nullptr}
 	};
 // clang-format on