MDEV-17666 sql_mode=ORACLE: Keyword ELSEIF should not be reserved

mysql-test/suite/compat/oracle/r/parser.result

@@ -532,3 +532,17 @@ BEGIN
 NULL;
 END;
 /
+#
+# MDEV-17666 sql_mode=ORACLE: Keyword ELSEIF should not be reserved
+#
+DECLARE
+ELSEIF INT;
+BEGIN
+ELSEIF:=1;
+END;
+/
+BEGIN
+<<ELSEIF>>
+NULL;
+END;
+/

mysql-test/suite/compat/oracle/t/parser.test

@@ -316,3 +316,26 @@ BEGIN
 END;
 /
 DELIMITER ;/
+
+
+--echo #
+--echo # MDEV-17666 sql_mode=ORACLE: Keyword ELSEIF should not be reserved
+--echo #
+
+DELIMITER /;
+DECLARE
+  ELSEIF INT;
+BEGIN
+  ELSEIF:=1;
+END;
+/
+DELIMITER ;/
+
+DELIMITER /;
+BEGIN
+<<ELSEIF>>
+  NULL;
+END;
+/
+DELIMITER ;/
+

sql/gen_lex_token.cc

@@ -258,7 +258,8 @@ void compute_tokens()
   set_start_expr_token(RETURN_MARIADB_SYM);
   set_start_expr_token(RETURN_ORACLE_SYM);
   set_start_expr_token(IF_SYM);
-  set_start_expr_token(ELSEIF_SYM);
+  set_start_expr_token(ELSEIF_MARIADB_SYM);
+  set_start_expr_token(ELSEIF_ORACLE_SYM);
   set_start_expr_token(CASE_SYM);
   set_start_expr_token(WHEN_SYM);
   set_start_expr_token(WHILE_SYM);

sql/lex.h

@@ -205,7 +205,7 @@ static SYMBOL symbols[] = {
   { "DYNAMIC",		SYM(DYNAMIC_SYM)},
   { "EACH",             SYM(EACH_SYM)},
   { "ELSE",             SYM(ELSE)},
-  { "ELSEIF",           SYM(ELSEIF_SYM)},
+  { "ELSEIF",           SYM(ELSEIF_MARIADB_SYM)},
   { "ELSIF",            SYM(ELSIF_MARIADB_SYM)},
   { "ENABLE",		SYM(ENABLE_SYM)},
   { "ENCLOSED",		SYM(ENCLOSED)},

sql/sql_lex.cc

@@ -845,6 +845,7 @@ int Lex_input_stream::find_keyword(Lex_ident_cli_st *kwd,
       case BODY_MARIADB_SYM:           return BODY_ORACLE_SYM;
       case CONTINUE_MARIADB_SYM:       return CONTINUE_ORACLE_SYM;
       case DECODE_MARIADB_SYM:         return DECODE_ORACLE_SYM;
+      case ELSEIF_MARIADB_SYM:         return ELSEIF_ORACLE_SYM;
       case ELSIF_MARIADB_SYM:          return ELSIF_ORACLE_SYM;
       case EXCEPTION_MARIADB_SYM:      return EXCEPTION_ORACLE_SYM;
       case EXIT_MARIADB_SYM:           return EXIT_ORACLE_SYM;

sql/sql_yacc.yy

@@ -984,7 +984,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
 %token  DUAL_SYM
 %token  EACH_SYM                      /* SQL-2003-R */
 %token  ELSE                          /* SQL-2003-R */
-%token  ELSEIF_SYM
+%token  ELSEIF_MARIADB_SYM
 %token  ELSIF_ORACLE_SYM              /* PLSQL-R    */
 %token  ENCLOSED
 %token  END_OF_INPUT                  /* INTERNAL */
@@ -1219,6 +1219,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
   Keywords that have different reserved status in std/oracle modes.
 */
 %token  <kwd>  BODY_MARIADB_SYM              // Oracle-R
+%token  <kwd>  ELSEIF_ORACLE_SYM
 %token  <kwd>  ELSIF_MARIADB_SYM             // PLSQL-R
 %token  <kwd>  EXCEPTION_ORACLE_SYM          // SQL-2003-N, PLSQL-R
 %token  <kwd>  GOTO_MARIADB_SYM              // Oracle-R
@@ -4510,7 +4511,7 @@ sp_if:
 
 sp_elseifs:
           /* Empty */
-        | ELSEIF_SYM sp_if
+        | ELSEIF_MARIADB_SYM sp_if
         | ELSE sp_proc_stmts1
         ;
 
@@ -15883,6 +15884,7 @@ keyword_sp_var_and_label:
         | DUMPFILE
         | DUPLICATE_SYM
         | DYNAMIC_SYM
+        | ELSEIF_ORACLE_SYM
         | ELSIF_MARIADB_SYM
         | ENDS_SYM
         | ENGINE_SYM

sql/sql_yacc_ora.yy

@@ -378,7 +378,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
 %token  DUAL_SYM
 %token  EACH_SYM                      /* SQL-2003-R */
 %token  ELSE                          /* SQL-2003-R */
-%token  ELSEIF_SYM
+%token  ELSEIF_MARIADB_SYM
 %token  ELSIF_ORACLE_SYM              /* PLSQL-R    */
 %token  ENCLOSED
 %token  END_OF_INPUT                  /* INTERNAL */
@@ -613,6 +613,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
   Keywords that have different reserved status in std/oracle modes.
 */
 %token  <kwd>  BODY_MARIADB_SYM              // Oracle-R
+%token  <kwd>  ELSEIF_ORACLE_SYM
 %token  <kwd>  ELSIF_MARIADB_SYM             // PLSQL-R
 %token  <kwd>  EXCEPTION_ORACLE_SYM          // SQL-2003-N, PLSQL-R
 %token  <kwd>  GOTO_MARIADB_SYM              // Oracle-R
@@ -15917,6 +15918,7 @@ keyword_sp_var_and_label:
         | DUMPFILE
         | DUPLICATE_SYM
         | DYNAMIC_SYM
+        | ELSEIF_ORACLE_SYM
         | ELSIF_MARIADB_SYM
         | ENDS_SYM
         | ENGINE_SYM