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/*
Copyright(C) 2016-2017 Brazil
Copyright(C) 2019-2021 Sutou Kouhei <kou@clear-code.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "grn_db.h"
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
grn_obj *table;
bool is_context_table;
grn_obj *window_function_call;
grn_proc *window_function;
grn_obj arguments;
grn_obj *output_column;
grn_obj key_columns;
grn_obj ids;
ssize_t current_index;
} grn_window_shard;
struct _grn_window {
grn_window_shard *shards;
size_t n_shards;
ssize_t current_shard;
grn_id current_id;
grn_window_direction direction;
bool is_sorted;
struct {
size_t n;
grn_obj *buffer1;
grn_obj *buffer2;
grn_obj *previous;
grn_obj *current;
} values;
bool is_value_changed_computed;
bool is_value_changed;
};
grn_rc grn_window_init(grn_ctx *ctx,
grn_window *window);
grn_rc grn_window_fin(grn_ctx *ctx, grn_window *window);
grn_rc grn_window_reset(grn_ctx *ctx, grn_window *window);
grn_rc grn_window_add_record(grn_ctx *ctx,
grn_window *window,
grn_obj *table,
bool is_context_table,
grn_id record_id,
grn_obj *window_function_call,
grn_obj *output_column,
grn_obj *key_columns);
bool grn_window_is_empty(grn_ctx *ctx, grn_window *window);
grn_rc grn_window_set_is_sorted(grn_ctx *ctx,
grn_window *window,
bool is_sorted);
grn_rc grn_window_execute(grn_ctx *ctx, grn_window *window);
#ifdef __cplusplus
}
#endif
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