/*****************************************************************************

Copyright (c) 2014, 2023, Oracle and/or its affiliates.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.

This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation.  The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.

This program 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 General Public License, version 2.0, for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA

*****************************************************************************/

/******************************************************************//**
@file include gis0rtree.h
R-tree header file

Created 2013/03/27 Jimmy Yang and Allen Lai
***********************************************************************/

#ifndef gis0rtree_h
#define gis0rtree_h

#include "univ.i"

#include "data0type.h"
#include "data0types.h"
#include "dict0types.h"
#include "hash0hash.h"
#include "mem0mem.h"
#include "page0page.h"
#include "rem0types.h"
#include "row0types.h"
#include "trx0types.h"
#include "ut0vec.h"
#include "ut0wqueue.h"
#include "que0types.h"
#include "gis0geo.h"
#include "gis0type.h"
#include "btr0types.h"
#include "btr0cur.h"

/* Whether MBR 'a' contains 'b' */
#define	MBR_CONTAIN_CMP(a, b)					\
	((((b)->xmin >= (a)->xmin) && ((b)->xmax <= (a)->xmax)	\
	 && ((b)->ymin >= (a)->ymin) && ((b)->ymax <= (a)->ymax)))

/* Whether MBR 'a' equals to 'b' */
#define	MBR_EQUAL_CMP(a, b)					\
	((((b)->xmin == (a)->xmin) && ((b)->xmax == (a)->xmax))	\
	 && (((b)->ymin == (a)->ymin) && ((b)->ymax == (a)->ymax)))

/* Whether MBR 'a' intersects 'b' */
#define	MBR_INTERSECT_CMP(a, b)					\
	((((b)->xmin <= (a)->xmax) || ((b)->xmax >= (a)->xmin))	\
	 && (((b)->ymin <= (a)->ymax) || ((b)->ymax >= (a)->ymin)))

/* Whether MBR 'a' and 'b' disjoint */
#define	MBR_DISJOINT_CMP(a, b)	(!MBR_INTERSECT_CMP(a, b))

/* Whether MBR 'a' within 'b' */
#define	MBR_WITHIN_CMP(a, b)					\
	((((b)->xmin <= (a)->xmin) && ((b)->xmax >= (a)->xmax))	\
	 && (((b)->ymin <= (a)->ymin) && ((b)->ymax >= (a)->ymax)))

/* Define it for rtree search mode checking. */
#define RTREE_SEARCH_MODE(mode)					\
	(((mode) >= PAGE_CUR_CONTAIN) && ((mode <= PAGE_CUR_RTREE_GET_FATHER)))

/* Geometry data header */
#define	GEO_DATA_HEADER_SIZE	4
/**********************************************************************//**
Builds a Rtree node pointer out of a physical record and a page number.
@return own: node pointer */
dtuple_t*
rtr_index_build_node_ptr(
/*=====================*/
	const dict_index_t*	index,	/*!< in: index */
	const rtr_mbr_t*	mbr,	/*!< in: mbr of lower page */
	const rec_t*		rec,	/*!< in: record for which to build node
					pointer */
	ulint			page_no,/*!< in: page number to put in node
					pointer */
	mem_heap_t*		heap,	/*!< in: memory heap where pointer
					created */
	ulint			level);	/*!< in: level of rec in tree:
					0 means leaf level */

/*************************************************************//**
Splits an R-tree index page to halves and inserts the tuple. It is assumed
that mtr holds an x-latch to the index tree. NOTE: the tree x-latch is
released within this function! NOTE that the operation of this
function must always succeed, we cannot reverse it: therefore enough
free disk space (2 pages) must be guaranteed to be available before
this function is called.
@return inserted record */
rec_t*
rtr_page_split_and_insert(
/*======================*/
	ulint		flags,	/*!< in: undo logging and locking flags */
	btr_cur_t*	cursor,	/*!< in/out: cursor at which to insert; when the
				function returns, the cursor is positioned
				on the predecessor of the inserted record */
	ulint**		offsets,/*!< out: offsets on inserted record */
	mem_heap_t**	heap,	/*!< in/out: pointer to memory heap, or NULL */
	const dtuple_t*	tuple,	/*!< in: tuple to insert */
	ulint		n_ext,	/*!< in: number of externally stored columns */
	mtr_t*		mtr);	/*!< in: mtr */

/**************************************************************//**
Sets the child node mbr in a node pointer. */
UNIV_INLINE
void
rtr_page_cal_mbr(
/*=============*/
	const dict_index_t*	index,	/*!< in: index */
	const buf_block_t*	block,	/*!< in: buffer block */
	rtr_mbr_t*		mbr,	/*!< out: MBR encapsulates the page */
	mem_heap_t*		heap);	/*!< in: heap for the memory
					allocation */
/*************************************************************//**
Find the next matching record. This function will first exhaust
the copied record listed in the rtr_info->matches vector before
moving to next page
@return true if there is next qualified record found, otherwise(if
exhausted) false */
bool
rtr_pcur_move_to_next(
/*==================*/
	const dtuple_t*	tuple,	/*!< in: data tuple; NOTE: n_fields_cmp in
				tuple must be set so that it cannot get
				compared to the node ptr page number field! */
	page_cur_mode_t	mode,	/*!< in: cursor search mode */
	btr_pcur_t*	cursor, /*!< in: persistent cursor; NOTE that the
				function may release the page latch */
	ulint		cur_level,
				/*!< in: current level */
	mtr_t*		mtr);	/*!< in: mtr */

/**************************************************************//**
Restores the stored position of a persistent cursor bufferfixing the page */
bool
rtr_cur_restore_position_func(
/*==========================*/
	ulint		latch_mode,	/*!< in: BTR_SEARCH_LEAF, ... */
	btr_cur_t*	cursor,		/*!< in: detached persistent cursor */
	ulint		level,		/*!< in: index level */
	const char*	file,		/*!< in: file name */
	ulint		line,		/*!< in: line where called */
	mtr_t*		mtr);		/*!< in: mtr */
#define rtr_cur_restore_position(l,cur,level,mtr)		\
	rtr_cur_restore_position_func(l,cur,level,__FILE__,__LINE__,mtr)

/****************************************************************//**
Searches the right position in rtree for a page cursor. */
bool
rtr_cur_search_with_match(
/*======================*/
	const buf_block_t*	block,	/*!< in: buffer block */
	dict_index_t*		index,	/*!< in: index descriptor */
	const dtuple_t*		tuple,	/*!< in: data tuple */
	page_cur_mode_t		mode,	/*!< in: PAGE_CUR_L,
					PAGE_CUR_LE, PAGE_CUR_G, or
					PAGE_CUR_GE */
	page_cur_t*		cursor,	/*!< in/out: page cursor */
	rtr_info_t*		rtr_info);/*!< in/out: search stack */

/****************************************************************//**
Calculate the area increased for a new record
@return area increased */
double
rtr_rec_cal_increase(
/*=================*/
	const dtuple_t*	dtuple,	/*!< in: data tuple to insert, which
				cause area increase */
	const rec_t*	rec,	/*!< in: physical record which differs from
				dtuple in some of the common fields, or which
				has an equal number or more fields than
				dtuple */
	const ulint*	offsets,/*!< in: array returned by rec_get_offsets() */
	double*		area);	/*!< out: increased area */

/****************************************************************//**
Following the right link to find the proper block for insert.
@return the proper block.*/
dberr_t
rtr_ins_enlarge_mbr(
/*=================*/
	btr_cur_t*		cursor,	/*!< in: btr cursor */
	que_thr_t*		thr,	/*!< in: query thread */
	mtr_t*			mtr);	/*!< in: mtr */

/********************************************************************//**
*/
void
rtr_get_father_node(
/*================*/
	dict_index_t*	index,	/*!< in: index */
	ulint		level,	/*!< in: the tree level of search */
	const dtuple_t* tuple,	/*!< in: data tuple; NOTE: n_fields_cmp in
				tuple must be set so that it cannot get
				compared to the node ptr page number field! */
	btr_cur_t*	sea_cur,/*!< in: search cursor */
	btr_cur_t*	cursor,	/*!< in/out: tree cursor; the cursor page is
				s- or x-latched */
	ulint		page_no,/*!< in: current page no */
	mtr_t*		mtr);	/*!< in: mtr */

/**************************************************************//**
push a nonleaf index node to the search path */
UNIV_INLINE
void
rtr_non_leaf_stack_push(
/*====================*/
	rtr_node_path_t*	path,		/*!< in/out: search path */
	ulint			pageno,		/*!< in: pageno to insert */
	node_seq_t		seq_no,		/*!< in: Node sequence num */
	ulint			level,		/*!< in: index level */
	ulint			child_no,	/*!< in: child page no */
	btr_pcur_t*		cursor,		/*!< in: position cursor */
	double			mbr_inc);	/*!< in: MBR needs to be
						enlarged */

/**************************************************************//**
push a nonleaf index node to the search path for insertion */
void
rtr_non_leaf_insert_stack_push(
/*===========================*/
	dict_index_t*		index,		/*!< in: index descriptor */
	rtr_node_path_t*	path,		/*!< in/out: search path */
	ulint			level,		/*!< in: index level */
	const buf_block_t*	block,		/*!< in: block of the page */
	const rec_t*		rec,		/*!< in: positioned record */
	double			mbr_inc);	/*!< in: MBR needs to be
						enlarged */

/*****************************************************************//**
Allocates a new Split Sequence Number.
@return new SSN id */
UNIV_INLINE
node_seq_t
rtr_get_new_ssn_id(
/*===============*/
	dict_index_t*	index);		/*!< in: the index struct */

/*****************************************************************//**
Get the current Split Sequence Number.
@return current SSN id */
UNIV_INLINE
node_seq_t
rtr_get_current_ssn_id(
/*===================*/
	dict_index_t*	index);		/*!< in/out: the index struct */

/********************************************************************//**
Create a RTree search info structure */
rtr_info_t*
rtr_create_rtr_info(
/******************/
	bool		need_prdt,	/*!< in: Whether predicate lock is
					needed */
	bool		init_matches,	/*!< in: Whether to initiate the
					"matches" structure for collecting
					matched leaf records */
	btr_cur_t*	cursor,		/*!< in: tree search cursor */
	dict_index_t*	index);		/*!< in: index struct */

/********************************************************************//**
Update a btr_cur_t with rtr_info */
void
rtr_info_update_btr(
/******************/
	btr_cur_t*	cursor,		/*!< in/out: tree cursor */
	rtr_info_t*	rtr_info);	/*!< in: rtr_info to set to the
					cursor */

/********************************************************************//**
Update a btr_cur_t with rtr_info */
void
rtr_init_rtr_info(
/****************/
	rtr_info_t*	rtr_info,	/*!< in: rtr_info to set to the
					cursor */
	bool		need_prdt,	/*!< in: Whether predicate lock is
					needed */
	btr_cur_t*	cursor,		/*!< in: tree search cursor */
	dict_index_t*	index,		/*!< in: index structure */
	bool		reinit);	/*!< in: Whether this is a reinit */

/**************************************************************//**
Clean up Rtree cursor */
void
rtr_clean_rtr_info(
/*===============*/
	rtr_info_t*	rtr_info,	/*!< in: RTree search info */
	bool		free_all);	/*!< in: need to free rtr_info itself */

/****************************************************************//**
Get the bounding box content from an index record*/
void
rtr_get_mbr_from_rec(
/*=================*/
	const rec_t*	rec,	/*!< in: data tuple */
	const ulint*	offsets,/*!< in: offsets array */
	rtr_mbr_t*	mbr);	/*!< out MBR */

/****************************************************************//**
Get the bounding box content from a MBR data record */
void
rtr_get_mbr_from_tuple(
/*===================*/
	const dtuple_t*	dtuple,	/*!< in: data tuple */
	rtr_mbr*	mbr);	/*!< out: mbr to fill */

#define rtr_page_get_father_node_ptr(of,heap,sea,cur,mtr)		\
	rtr_page_get_father_node_ptr_func(of,heap,sea,cur,__FILE__,__LINE__,mtr)

/* Get the rtree page father.
@param[in]	offsets		work area for the return value
@param[in]	index		rtree index
@param[in]	block		child page in the index
@param[in]	mtr		mtr
@param[in]	sea_cur		search cursor, contains information
				about parent nodes in search
@param[in]	cursor		cursor on node pointer record,
				its page x-latched */
void
rtr_page_get_father(
	dict_index_t*	index,
	buf_block_t*	block,
	mtr_t*		mtr,
	btr_cur_t*	sea_cur,
	btr_cur_t*	cursor);

/************************************************************//**
Returns the upper level node pointer to a R-Tree page. It is assumed
that mtr holds an x-latch on the tree.
@return rec_get_offsets() of the node pointer record */
ulint*
rtr_page_get_father_node_ptr_func(
/*==============================*/
	ulint*		offsets,/*!< in: work area for the return value */
	mem_heap_t*	heap,	/*!< in: memory heap to use */
	btr_cur_t*	sea_cur,/*!< in: search cursor */
	btr_cur_t*	cursor,	/*!< in: cursor pointing to user record,
				out: cursor on node pointer record,
				its page x-latched */
	const char*	file,	/*!< in: file name */
	ulint		line,	/*!< in: line where called */
	mtr_t*		mtr);	/*!< in: mtr */


/************************************************************//**
Returns the father block to a page. It is assumed that mtr holds
an X or SX latch on the tree.
@return rec_get_offsets() of the node pointer record */
ulint*
rtr_page_get_father_block(
/*======================*/
	ulint*		offsets,/*!< in: work area for the return value */
	mem_heap_t*	heap,	/*!< in: memory heap to use */
	dict_index_t*	index,	/*!< in: b-tree index */
	buf_block_t*	block,	/*!< in: child page in the index */
	mtr_t*		mtr,	/*!< in: mtr */
	btr_cur_t*	sea_cur,/*!< in: search cursor, contains information
				about parent nodes in search */
	btr_cur_t*	cursor);/*!< out: cursor on node pointer record,
				its page x-latched */
/**************************************************************//**
Store the parent path cursor
@return number of cursor stored */
ulint
rtr_store_parent_path(
/*==================*/
	const buf_block_t*	block,	/*!< in: block of the page */
	btr_cur_t*		btr_cur,/*!< in/out: persistent cursor */
	ulint			latch_mode,
					/*!< in: latch_mode */
	ulint			level,	/*!< in: index level */
	mtr_t*			mtr);	/*!< in: mtr */

/**************************************************************//**
Initializes and opens a persistent cursor to an index tree. It should be
closed with btr_pcur_close. */
void
rtr_pcur_open_low(
/*==============*/
	dict_index_t*	index,	/*!< in: index */
	ulint		level,	/*!< in: level in the btree */
	const dtuple_t*	tuple,	/*!< in: tuple on which search done */
	page_cur_mode_t	mode,	/*!< in: PAGE_CUR_L, ...;
				NOTE that if the search is made using a unique
				prefix of a record, mode should be
				PAGE_CUR_LE, not PAGE_CUR_GE, as the latter
				may end up on the previous page from the
				record! */
	ulint		latch_mode,/*!< in: BTR_SEARCH_LEAF, ... */
	btr_pcur_t*	cursor,	/*!< in: memory buffer for persistent cursor */
	const char*	file,	/*!< in: file name */
	ulint		line,	/*!< in: line where called */
	mtr_t*		mtr);	/*!< in: mtr */

#define rtr_pcur_open(i,t,md,l,c,m)			\
	rtr_pcur_open_low(i,0,t,md,l,c,__FILE__,__LINE__,m)

struct btr_cur_t;

/*********************************************************//**
Returns the R-Tree node stored in the parent search path
@return pointer to R-Tree cursor component */
UNIV_INLINE
node_visit_t*
rtr_get_parent_node(
/*================*/
	btr_cur_t*	btr_cur,	/*!< in: persistent cursor */
	ulint		level,		/*!< in: index level of buffer page */
	ulint		is_insert);	/*!< in: whether it is insert */

/*********************************************************//**
Returns the R-Tree cursor stored in the parent search path
@return pointer to R-Tree cursor component */
UNIV_INLINE
btr_pcur_t*
rtr_get_parent_cursor(
/*==================*/
	btr_cur_t*	btr_cur,	/*!< in: persistent cursor */
	ulint		level,		/*!< in: index level of buffer page */
	ulint		is_insert);	/*!< in: whether insert operation */

/*************************************************************//**
Copy recs from a page to new_block of rtree. */
void
rtr_page_copy_rec_list_end_no_locks(
/*================================*/
	buf_block_t*	new_block,	/*!< in: index page to copy to */
	buf_block_t*	block,		/*!< in: index page of rec */
	rec_t*		rec,		/*!< in: record on page */
	dict_index_t*	index,		/*!< in: record descriptor */
	mem_heap_t*	heap,		/*!< in/out: heap memory */
	rtr_rec_move_t*	rec_move,	/*!< in: recording records moved */
	ulint		max_move,	/*!< in: num of rec to move */
	ulint*		num_moved,	/*!< out: num of rec to move */
	mtr_t*		mtr);		/*!< in: mtr */

/*************************************************************//**
Copy recs till a specified rec from a page to new_block of rtree. */
void
rtr_page_copy_rec_list_start_no_locks(
/*==================================*/
	buf_block_t*	new_block,	/*!< in: index page to copy to */
	buf_block_t*	block,		/*!< in: index page of rec */
	rec_t*		rec,		/*!< in: record on page */
	dict_index_t*	index,		/*!< in: record descriptor */
	mem_heap_t*	heap,		/*!< in/out: heap memory */
	rtr_rec_move_t*	rec_move,	/*!< in: recording records moved */
	ulint		max_move,	/*!< in: num of rec to move */
	ulint*		num_moved,	/*!< out: num of rec to move */
	mtr_t*		mtr);		/*!< in: mtr */

/****************************************************************//**
Merge 2 mbrs and update the the mbr that cursor is on. */
dberr_t
rtr_merge_and_update_mbr(
/*=====================*/
	btr_cur_t*		cursor,		/*!< in/out: cursor */
	btr_cur_t*		cursor2,	/*!< in: the other cursor */
	ulint*			offsets,	/*!< in: rec offsets */
	ulint*			offsets2,	/*!< in: rec offsets */
	page_t*			child_page,	/*!< in: the child page. */
	buf_block_t*		merge_block,	/*!< in: page to merge */
	buf_block_t*		block,		/*!< in: page be merged */
	dict_index_t*		index,		/*!< in: index */
	mtr_t*			mtr);		/*!< in: mtr */

/*************************************************************//**
Deletes on the upper level the node pointer to a page. */
void
rtr_node_ptr_delete(
/*================*/
	dict_index_t*	index,	/*!< in: index tree */
	btr_cur_t*	sea_cur,/*!< in: search cursor, contains information
				about parent nodes in search */
	buf_block_t*	block,	/*!< in: page whose node pointer is deleted */
	mtr_t*		mtr);	/*!< in: mtr */

/****************************************************************//**
Check two MBRs are identical or need to be merged */
bool
rtr_merge_mbr_changed(
/*==================*/
	btr_cur_t*	cursor,		/*!< in: cursor */
	btr_cur_t*	cursor2,	/*!< in: the other cursor */
	ulint*		offsets,	/*!< in: rec offsets */
	ulint*		offsets2,	/*!< in: rec offsets */
	rtr_mbr_t*	new_mbr,	/*!< out: MBR to update */
	buf_block_t*	merge_block,	/*!< in: page to merge */
	buf_block_t*	block,		/*!< in: page be merged */
	dict_index_t*	index);		/*!< in: index */


/**************************************************************//**
Update the mbr field of a spatial index row.
@return true if successful */
bool
rtr_update_mbr_field(
/*=================*/
	btr_cur_t*	cursor,		/*!< in: cursor pointed to rec.*/
	ulint*		offsets,	/*!< in: offsets on rec. */
	btr_cur_t*	cursor2,	/*!< in/out: cursor pointed to rec
					that should be deleted.
					this cursor is for btr_compress to
					delete the merged page's father rec.*/
	page_t*		child_page,	/*!< in: child page. */
	rtr_mbr_t*	new_mbr,	/*!< in: the new mbr. */
	rec_t*		new_rec,	/*!< in: rec to use */
	mtr_t*		mtr);		/*!< in: mtr */

/**************************************************************//**
Check whether a Rtree page is child of a parent page
@return true if there is child/parent relationship */
bool
rtr_check_same_block(
/*=================*/
	dict_index_t*	index,	/*!< in: index tree */
	btr_cur_t*	cur,	/*!< in/out: position at the parent entry
				pointing to the child if successful */
	buf_block_t*	parentb,/*!< in: parent page to check */
	buf_block_t*	childb, /*!< in: child Page */
	mem_heap_t*	heap);	/*!< in: memory heap */

/*********************************************************************//**
Sets pointer to the data and length in a field. */
UNIV_INLINE
void
rtr_write_mbr(
/*==========*/
	byte*			data,	/*!< out: data */
	const rtr_mbr_t*	mbr);	/*!< in: data */

/*********************************************************************//**
Sets pointer to the data and length in a field. */
UNIV_INLINE
void
rtr_read_mbr(
/*==========*/
	const byte*		data,	/*!< in: data */
	rtr_mbr_t*		mbr);	/*!< out: data */

/**************************************************************//**
Check whether a discarding page is in anyone's search path */
void
rtr_check_discard_page(
/*===================*/
	dict_index_t*	index,	/*!< in: index */
	btr_cur_t*	cursor,	/*!< in: cursor on the page to discard: not on
				the root page */
	buf_block_t*	block);	/*!< in: block of page to be discarded */

/********************************************************************//**
Reinitialize a RTree search info */
UNIV_INLINE
void
rtr_info_reinit_in_cursor(
/************************/
	btr_cur_t*	cursor,		/*!< in/out: tree cursor */
	dict_index_t*	index,		/*!< in: index struct */
	bool		need_prdt);	/*!< in: Whether predicate lock is
					needed */

/** Estimates the number of rows in a given area.
@param[in]	index	index
@param[in]	tuple	range tuple containing mbr, may also be empty tuple
@param[in]	mode	search mode
@return estimated number of rows */
int64_t
rtr_estimate_n_rows_in_range(
	dict_index_t*	index,
	const dtuple_t*	tuple,
	page_cur_mode_t	mode);

#ifndef UNIV_NONINL
#include "gis0rtree.ic"
#endif
#endif /*!< gis0rtree.h */
