/*
 * 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.
 */
/*-------------------------------------------------------------------------
 *
 * nodeWindow.h
 *	  prototypes for nodeWindow.c
 *
 *-------------------------------------------------------------------------
 */
#ifndef NODEWINDOW_H
#define NODEWINDOW_H

#include "nodes/execnodes.h"

extern int	ExecCountSlotsWindow(Window *node);
extern WindowState *ExecInitWindow(Window *node, EState *estate, int eflags);
extern TupleTableSlot *ExecWindow(WindowState *node);
extern void ExecEndWindow(WindowState *node);
extern void ExecReScanWindow(WindowState *node, ExprContext *exprCtxt);
extern void ExecEagerFreeWindow(WindowState *node);

/* Dummy window function implementation for pg_proc (prosrc). */
extern Datum window_dummy(PG_FUNCTION_ARGS);

/* Internal-use function to tag tuples with originating segment. */
extern Datum mpp_execution_segment(PG_FUNCTION_ARGS);
extern Datum gp_execution_dbid(PG_FUNCTION_ARGS);

/* Declarations for window function implementations. */
extern Datum row_number_immed(PG_FUNCTION_ARGS);
extern Datum rank_immed(PG_FUNCTION_ARGS);
extern Datum dense_rank_immed(PG_FUNCTION_ARGS);
extern Datum cume_dist_prelim(PG_FUNCTION_ARGS);
extern Datum percent_rank_final(PG_FUNCTION_ARGS);
extern Datum cume_dist_final(PG_FUNCTION_ARGS);
Datum ntile_prelim_int(PG_FUNCTION_ARGS);
Datum ntile_prelim_bigint(PG_FUNCTION_ARGS);
Datum ntile_prelim_numeric(PG_FUNCTION_ARGS);
Datum ntile_final(PG_FUNCTION_ARGS);
extern Datum lead_generic(PG_FUNCTION_ARGS);
extern Datum last_value_generic(PG_FUNCTION_ARGS);
extern Datum first_value_generic(PG_FUNCTION_ARGS);
extern Datum lag_generic(PG_FUNCTION_ARGS);

enum {
	GPMON_WINDOW_TOTAL = GPMON_QEXEC_M_NODE_START,
};

static inline gpmon_packet_t * GpmonPktFromWindowState(WindowState *node)
{
	return &node->ps.gpmon_pkt;
}

#endif   /* NODEWINDOW_H */