MDEV-12270 Port MySQL 8.0 Bug#21141390 REMOVE UNUSED FUNCTIONS AND CONVERT GLOBAL SYMBOLS TO STATIC

InnoDB defines some functions that are not called at all.
Other functions are called, but only from the same compilation unit.

Remove some function declarations and definitions, and add 'static'
keywords. Some symbols must be kept for separately compiled tools,
such as innochecksum.

storage/innobase/include/fts0priv.h

@@ -232,30 +232,6 @@ fts_check_token(
 	bool			is_ngram,
 	const CHARSET_INFO*	cs);
 
-/*******************************************************************//**
-Tokenize a document. */
-void
-fts_tokenize_document(
-/*==================*/
-	fts_doc_t*	doc,		/*!< in/out: document to
-					tokenize */
-	fts_doc_t*	result,		/*!< out: if provided, save
-					result tokens here */
-	st_mysql_ftparser*	parser);/* in: plugin fts parser */
-
-/*******************************************************************//**
-Continue to tokenize a document. */
-void
-fts_tokenize_document_next(
-/*=======================*/
-	fts_doc_t*	doc,		/*!< in/out: document to
-					tokenize */
-	ulint		add_pos,	/*!< in: add this position to all
-					tokens from this tokenization */
-	fts_doc_t*	result,		/*!< out: if provided, save
-					result tokens here */
-	st_mysql_ftparser*	parser);/* in: plugin fts parser */
-
 /******************************************************************//**
 Initialize a document. */
 void
@@ -302,16 +278,6 @@ fts_index_fetch_nodes(
 			word,		/*!< in: the word to fetch */
 	fts_fetch_t*	fetch);		/*!< in: fetch callback.*/
 
-/******************************************************************//**
-Create a fts_optimizer_word_t instance.
-@return new instance */
-fts_word_t*
-fts_word_init(
-/*==========*/
-	fts_word_t*	word,		/*!< in: word to initialize */
-	byte*		utf8,		/*!< in: UTF-8 string */
-	ulint		len);		/*!< in: length of string in bytes */
-
 /******************************************************************//**
 Compare two fts_trx_table_t instances, we actually compare the
 table id's here.
@@ -429,31 +395,7 @@ fts_config_set_index_value(
 					config table */
 	MY_ATTRIBUTE((warn_unused_result));
 
-/******************************************************************//**
-Increment the value in the config table for column name.
-@return DB_SUCCESS or error code */
-dberr_t
-fts_config_increment_value(
-/*=======================*/
-	trx_t*		trx,		/*!< transaction */
-	fts_table_t*	fts_table,	/*!< in: the indexed FTS table */
-	const char*	name,		/*!< in: increment config value
-					for this parameter name */
-	ulint		delta)		/*!< in: increment by this much */
-	MY_ATTRIBUTE((warn_unused_result));
-
-/******************************************************************//**
-Increment the per index value in the config table for column name.
-@return DB_SUCCESS or error code */
-dberr_t
-fts_config_increment_index_value(
-/*=============================*/
-	trx_t*		trx,		/*!< transaction */
-	dict_index_t*	index,		/*!< in: FTS index */
-	const char*	name,		/*!< in: increment config value
-					for this parameter name */
-	ulint		delta);		/*!< in: increment by this much */
-
+#ifdef FTS_OPTIMIZE_DEBUG
 /******************************************************************//**
 Get an ulint value from the config table.
 @return DB_SUCCESS or error code */
@@ -465,6 +407,7 @@ fts_config_get_index_ulint(
 	const char*	name,		/*!< in: param name */
 	ulint*		int_value)	/*!< out: value */
 	MY_ATTRIBUTE((warn_unused_result));
+#endif /* FTS_OPTIMIZE_DEBUG */
 
 /******************************************************************//**
 Set an ulint value int the config table.
@@ -501,17 +444,6 @@ fts_cache_find_word(
 			text)		/*!< in: word to search for */
 	MY_ATTRIBUTE((warn_unused_result));
 
-/******************************************************************//**
-Check cache for deleted doc id.
-@return TRUE if deleted */
-ibool
-fts_cache_is_deleted_doc_id(
-/*========================*/
-	const fts_cache_t*
-			cache,		/*!< in: cache ito search */
-	doc_id_t	doc_id)		/*!< in: doc id to search for */
-	MY_ATTRIBUTE((warn_unused_result));
-
 /******************************************************************//**
 Append deleted doc ids to vector and sort the vector. */
 void
@@ -533,18 +465,6 @@ fts_wait_for_background_thread_to_start(
 	ulint		max_wait);	/*!< in: time in microseconds, if set
 					to 0 then it disables timeout
 					checking */
-#ifdef FTS_DOC_STATS_DEBUG
-/******************************************************************//**
-Get the total number of words in the FTS for a particular FTS index.
-@return DB_SUCCESS or error code */
-dberr_t
-fts_get_total_word_count(
-/*=====================*/
-	trx_t*		trx,		/*!< in: transaction */
-	dict_index_t*	index,		/*!< in: for this index */
-	ulint*		total)		/*!< out: total words */
-	MY_ATTRIBUTE((warn_unused_result));
-#endif
 /******************************************************************//**
 Search the index specific cache for a particular FTS index.
 @return the index specific cache else NULL */
@@ -602,13 +522,6 @@ fts_optimize_add_table(
 /*===================*/
 	dict_table_t*	table);		/*!< in: table to add */
 
-/******************************************************************//**
-Optimize a table. */
-void
-fts_optimize_do_table(
-/*==================*/
-	dict_table_t*	table);		/*!< in: table to optimize */
-
 /******************************************************************//**
 Construct the prefix name of an FTS table.
 @return own: table name, must be freed with ut_free() */