MDEV-25075: Ignorable index makes the resulting CREATE TABLE invalid

- The patch itself
- More changes to the parser
- Fix by Sergei P to make the tests pass with --embedded

mysql-test/suite/perfschema/r/start_server_low_digest_sql_length.result

@@ -8,5 +8,5 @@ SELECT 1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1
 ####################################
 SELECT event_name, digest, digest_text, sql_text FROM events_statements_history_long;
 event_name	digest	digest_text	sql_text
-statement/sql/select	beb5bd93b7e8c45bc5cb6060804988e8	SELECT ? + ? + 	SELECT ...
-statement/sql/truncate	faf6cefb662b443f05e97b5c5ab14a59	TRUNCATE TABLE 	truncat...
+statement/sql/select	ade774bdfbc132a71810ede8ef469660	SELECT ? + ? + 	SELECT ...
+statement/sql/truncate	0f84807fb4a75d0f391f8a93e7c3c182	TRUNCATE TABLE 	truncat...

sql/lex.h

@@ -289,6 +289,7 @@ static SYMBOL symbols[] = {
   { "IDENTIFIED",	SYM(IDENTIFIED_SYM)},
   { "IF",		SYM(IF_SYM)},
   { "IGNORE",		SYM(IGNORE_SYM)},
+  { "IGNORED",		SYM(IGNORED_SYM)},
   { "IGNORE_DOMAIN_IDS", SYM(IGNORE_DOMAIN_IDS_SYM)},
   { "IGNORE_SERVER_IDS", SYM(IGNORE_SERVER_IDS_SYM)},
   { "IMMEDIATE",	SYM(IMMEDIATE_SYM)},

sql/sql_yacc.yy

@@ -532,6 +532,7 @@ End SQL_MODE_ORACLE_SPECIFIC */
 %token  <kwd> IF_SYM
 %token  <kwd> IGNORE_DOMAIN_IDS_SYM
 %token  <kwd> IGNORE_SYM
+%token  <kwd> IGNORED_SYM
 %token  <kwd> INDEX_SYM
 %token  <kwd> INFILE
 %token  <kwd> INNER_SYM                     /* SQL-2003-R */
@@ -7095,8 +7096,8 @@ btree_or_rtree:
         ;
 
 ignorability:
-          IGNORE_SYM { $$= true; }
-        | NOT_SYM IGNORE_SYM { $$= false; }
+          IGNORED_SYM { $$= true; }
+        | NOT_SYM IGNORED_SYM { $$= false; }
         ;
 
 key_list:
@@ -15315,6 +15316,7 @@ keyword_table_alias:
         | keyword_verb_clause
         | FUNCTION_SYM
         | EXCEPTION_ORACLE_SYM
+        | IGNORED_SYM
         ;
 
 /* Keyword that we allow for identifiers (except SP labels) */
@@ -15331,6 +15333,7 @@ keyword_ident:
         | FUNCTION_SYM
         | WINDOW_SYM
         | EXCEPTION_ORACLE_SYM
+        | IGNORED_SYM
         ;
 
 keyword_sysvar_name:
@@ -15345,6 +15348,7 @@ keyword_sysvar_name:
         | FUNCTION_SYM
         | WINDOW_SYM
         | EXCEPTION_ORACLE_SYM
+        | IGNORED_SYM
         ;
 
 keyword_set_usual_case:
@@ -15359,6 +15363,7 @@ keyword_set_usual_case:
         | FUNCTION_SYM
         | WINDOW_SYM
         | EXCEPTION_ORACLE_SYM
+        | IGNORED_SYM
         ;
 
 non_reserved_keyword_udt:
@@ -15975,6 +15980,7 @@ reserved_keyword_udt_not_param_type:
         | IF_SYM
         | IGNORE_DOMAIN_IDS_SYM
         | IGNORE_SYM
+        | IGNORED_SYM
         | INDEX_SYM
         | INFILE
         | INNER_SYM
@@ -17870,6 +17876,7 @@ keyword_label:
         | keyword_sysvar_type
         | FUNCTION_SYM
         | EXCEPTION_ORACLE_SYM
+        | IGNORED_SYM
         ;
 
 keyword_sp_decl:
@@ -17884,6 +17891,7 @@ keyword_sp_decl:
         | keyword_verb_clause
         | FUNCTION_SYM
         | WINDOW_SYM
+        | IGNORED_SYM
         ;
 
 opt_truncate_table_storage_clause:
@@ -18283,6 +18291,7 @@ keyword_label:
         | FUNCTION_SYM
         | COMPRESSED_SYM
         | EXCEPTION_ORACLE_SYM
+        | IGNORED_SYM
         ;
 
 keyword_sp_decl:
@@ -18293,6 +18302,7 @@ keyword_sp_decl:
         | keyword_sysvar_type
         | keyword_verb_clause
         | WINDOW_SYM
+        | IGNORED_SYM
         ;
 
 opt_truncate_table_storage_clause: