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diff --git a/fluent-bit/lib/avro/src/schema.h b/fluent-bit/lib/avro/src/schema.h
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to you under the Apache License, Version 2.0 
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.  See the License for the specific language governing
+ * permissions and limitations under the License. 
+ */
+#ifndef AVRO_SCHEMA_PRIV_H
+#define AVRO_SCHEMA_PRIV_H
+
+#include <avro/platform.h>
+#include "avro/basics.h"
+#include "avro/schema.h"
+#include "avro_private.h"
+#include "st.h"
+
+struct avro_record_field_t {
+	int index;
+	char *name;
+	avro_schema_t type;
+	/*
+	 * TODO: default values 
+	 */
+};
+
+struct avro_record_schema_t {
+	struct avro_obj_t obj;
+	char *name;
+	char *space;
+	st_table *fields;
+	st_table *fields_byname;
+};
+
+struct avro_enum_schema_t {
+	struct avro_obj_t obj;
+	char *name;
+	char *space;
+	st_table *symbols;
+	st_table *symbols_byname;
+};
+
+struct avro_array_schema_t {
+	struct avro_obj_t obj;
+	avro_schema_t items;
+};
+
+struct avro_map_schema_t {
+	struct avro_obj_t obj;
+	avro_schema_t values;
+};
+
+struct avro_union_schema_t {
+	struct avro_obj_t obj;
+	st_table *branches;
+	st_table *branches_byname;
+};
+
+struct avro_fixed_schema_t {
+	struct avro_obj_t obj;
+	const char *name;
+	const char *space;
+	int64_t size;
+};
+
+struct avro_link_schema_t {
+	struct avro_obj_t obj;
+	avro_schema_t to;
+};
+
+#define avro_schema_to_record(schema_)  (container_of(schema_, struct avro_record_schema_t, obj))
+#define avro_schema_to_enum(schema_)    (container_of(schema_, struct avro_enum_schema_t, obj))
+#define avro_schema_to_array(schema_)   (container_of(schema_, struct avro_array_schema_t, obj))
+#define avro_schema_to_map(schema_)     (container_of(schema_, struct avro_map_schema_t, obj))
+#define avro_schema_to_union(schema_)   (container_of(schema_, struct avro_union_schema_t, obj))
+#define avro_schema_to_fixed(schema_)   (container_of(schema_, struct avro_fixed_schema_t, obj))
+#define avro_schema_to_link(schema_)    (container_of(schema_, struct avro_link_schema_t, obj))
+
+#endif