Revert "MDEV-30528 Assertion in dtype_get_at_most_n_mbchars"

This reverts commit add0c01b

Duplicates must be avoided in FTS_DOC_ID_INDEX

mysql-test/suite/innodb_fts/r/innodb_fts_misc.result

@@ -1393,26 +1393,3 @@ INSERT INTO t1 VALUES(repeat("this is the test case", 500));
 ALTER TABLE t1 KEY_BLOCK_SIZE=4;
 ALTER TABLE t1 KEY_BLOCK_SIZE=0;
 DROP TABLE t1;
-#
-# MDEV-30528 Assertion in dtype_get_at_most_n_mbchars
-#
-create table t (f text) with system versioning character set utf8 engine=innodb;
-insert into t (f) values
-('mysql from tutorial dbms stands for database ...')  ,
-('when to use mysql well after that you went through a ...'),
-('where will optimizing mysql in what tutorial we will show ...'),
-('1001 mysql tricks 1. never run mysqld as root. 2. ...'),
-('mysql vs. yoursql in the following database comparison ...'),
-('mysql security when configured properly, mysql ...');
-delete from t where f like 'mysql%';
-alter table t add fulltext (f);
-select * from t where match(f) against ("use");
-f
-when to use mysql well after that you went through a ...
-select * from t where match(f) against ("run");
-f
-1001 mysql tricks 1. never run mysqld as root. 2. ...
-select * from t where match(f) against ("tutorial");
-f
-where will optimizing mysql in what tutorial we will show ...
-drop table t;

mysql-test/suite/innodb_fts/t/innodb_fts_misc.test

@@ -1341,21 +1341,3 @@ ALTER TABLE t1 KEY_BLOCK_SIZE=4;
 ALTER TABLE t1 KEY_BLOCK_SIZE=0;
 DROP TABLE t1;
 
---echo #
---echo # MDEV-30528 Assertion in dtype_get_at_most_n_mbchars
---echo #
-create table t (f text) with system versioning character set utf8 engine=innodb;
-insert into t (f) values
-        ('mysql from tutorial dbms stands for database ...')  ,
-        ('when to use mysql well after that you went through a ...'),
-        ('where will optimizing mysql in what tutorial we will show ...'),
-        ('1001 mysql tricks 1. never run mysqld as root. 2. ...'),
-        ('mysql vs. yoursql in the following database comparison ...'),
-        ('mysql security when configured properly, mysql ...');
-delete from t where f like 'mysql%';
-alter table t add fulltext (f);
-select * from t where match(f) against ("use");
-select * from t where match(f) against ("run");
-select * from t where match(f) against ("tutorial");
-# cleanup
-drop table t;

storage/innobase/row/row0merge.cc

@@ -502,8 +502,7 @@ row_merge_buf_add(
 	VCOL_STORAGE		vcol_storage;
 	DBUG_ENTER("row_merge_buf_add");
 
-	if (buf->n_tuples >= buf->max_tuples
-	    || (history_fts && (buf->index->type & DICT_FTS))) {
+	if (buf->n_tuples >= buf->max_tuples) {
 error:
 		n_row_added = 0;
 		goto end;
@@ -596,8 +595,7 @@ row_merge_buf_add(
 
 
 			/* Tokenize and process data for FTS */
-			if (index->type & DICT_FTS) {
-				ut_ad(!history_fts);
+			if (!history_fts && (index->type & DICT_FTS)) {
 				fts_doc_item_t*	doc_item;
 				byte*		value;
 				void*		ptr;
@@ -1878,7 +1876,6 @@ row_merge_read_clustered_index(
 	mach_write_to_8(new_sys_trx_start, trx->id);
 	mach_write_to_8(new_sys_trx_end, TRX_ID_MAX);
 	uint64_t	n_rows = 0;
-	bool history_row = false;
 
 	/* Scan the clustered index. */
 	for (;;) {
@@ -1895,7 +1892,7 @@ row_merge_read_clustered_index(
 		dtuple_t*	row;
 		row_ext_t*	ext;
 		page_cur_t*	cur	= btr_pcur_get_page_cur(&pcur);
-		bool history_fts = false;
+		bool history_row, history_fts = false;
 
 		page_cur_move_to_next(cur);
 
@@ -2530,8 +2527,7 @@ row_merge_read_clustered_index(
 						ut_ad(i == 0);
 						break;
 					}
-				} else if (!history_row
-					   && dict_index_is_unique(buf->index)) {
+				} else if (dict_index_is_unique(buf->index)) {
 					row_merge_dup_t	dup = {
 						buf->index, table, col_map, 0};