HAWQ-1628. Add hdfs protocol for pluggable storage framework

contrib/Makefile

@@ -9,6 +9,7 @@ WANTED_DIRS = \
 		extprotocol \
 		gp_cancel_query \
 		formatter_fixedwidth \
+		exthdfs\
 		hawq-hadoop
 
 ifeq ($(with_pgcrypto), yes)

contrib/exthdfs/Makefile

@@ -0,0 +1,34 @@
+# 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
+#
+#   http://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.
+#
+MODULE_big = exthdfs
+OBJS       = exthdfs.o
+
+PG_CPPFLAGS = -I$(libpq_srcdir)
+PG_LIBS = $(libpq_pgport)
+
+override CFLAGS += -lhdfs3
+
+ifdef USE_PGXS
+PGXS := $(shell pg_config --pgxs)
+include $(PGXS)
+else
+subdir = contrib/exthdfs
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+include $(top_srcdir)/contrib/contrib-global.mk
+endif

contrib/exthdfs/common.h

@@ -0,0 +1,38 @@
+/*
+ * 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
+ *
+ *   http://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 _EXTHDFS_COMMON_H_
+#define _EXTHDFS_COMMON_H_
+
+#include "postgres.h"
+#include "fmgr.h"
+#include "funcapi.h"
+#include "access/extprotocol.h"
+#include "access/fileam.h"
+#include "catalog/pg_proc.h"
+#include "catalog/pg_exttable.h"
+#include "utils/array.h"
+#include "utils/builtins.h"
+#include "utils/memutils.h"
+#include "miscadmin.h"
+
+#include <fcntl.h>
+
+#endif  // _EXTHDFS_COMMON_H_
+