MDEV-10411 Providing compatibility for basic PL/SQL constructs

Part 15: ELSIF vs ELSEIF

Also, moving tests for Oracle keywords in sql_mode=DEFAULT
from "parser.test" to a better place "keywords.test".

mysql-test/r/keywords.result

@@ -331,3 +331,18 @@ DROP TABLE OTHERS;
 #
 CREATE TABLE immediate (immediate int);
 DROP TABLE immediate;
+#
+# MDEV-10142 Pluggable parser
+# Testing keywords that were added into lex.h for Oracle compatibility
+# that are not reserved keywords in MariaDB
+#
+CREATE TABLE clob (clob int);
+DROP TABLE clob;
+CREATE TABLE elsif (elsif INT);
+DROP TABLE elsif;
+CREATE TABLE exception (exception INT);
+DROP TABLE exception;
+CREATE TABLE raw (raw int);
+DROP TABLE raw;
+CREATE TABLE varchar2 (varchar2 int);
+DROP TABLE varchar2;

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

@@ -326,6 +326,20 @@ CREATE TABLE begin (begin INT);
 DROP TABLE begin;
 CREATE TABLE end (end INT);
 DROP TABLE end;
+# Testing ELSIF
+CREATE FUNCTION f1(a INT) RETURN CLOB
+AS
+BEGIN
+IF a=1 THEN RETURN 'a is 1';
+ELSIF a=2 THEN RETURN 'a is 2';
+ELSE RETURN 'a is unknown';
+END IF;
+END;
+/
+SELECT f1(2) FROM DUAL;
+f1(2)
+a is 2
+DROP FUNCTION f1;
 # Testing top-level declarations
 CREATE PROCEDURE p1 (p1 OUT VARCHAR2(10))
 AS

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

@@ -342,6 +342,22 @@ DROP TABLE begin;
 CREATE TABLE end (end INT);
 DROP TABLE end;
 
+--echo # Testing ELSIF
+DELIMITER /;
+CREATE FUNCTION f1(a INT) RETURN CLOB
+AS
+BEGIN
+  IF a=1 THEN RETURN 'a is 1';
+  ELSIF a=2 THEN RETURN 'a is 2';
+  ELSE RETURN 'a is unknown';
+  END IF;
+END;
+/
+DELIMITER ;/
+SELECT f1(2) FROM DUAL;
+DROP FUNCTION f1;
+
+
 
 --echo # Testing top-level declarations
 DELIMITER /;

mysql-test/t/keywords.test

@@ -220,3 +220,24 @@ DROP TABLE OTHERS;
 
 CREATE TABLE immediate (immediate int);
 DROP TABLE immediate;
+
+--echo #
+--echo # MDEV-10142 Pluggable parser
+--echo # Testing keywords that were added into lex.h for Oracle compatibility
+--echo # that are not reserved keywords in MariaDB
+--echo #
+
+CREATE TABLE clob (clob int);
+DROP TABLE clob;
+
+CREATE TABLE elsif (elsif INT);
+DROP TABLE elsif;
+
+CREATE TABLE exception (exception INT);
+DROP TABLE exception;
+
+CREATE TABLE raw (raw int);
+DROP TABLE raw;
+
+CREATE TABLE varchar2 (varchar2 int);
+DROP TABLE varchar2;

sql/lex.h

@@ -203,6 +203,7 @@ static SYMBOL symbols[] = {
   { "EACH",             SYM(EACH_SYM)},
   { "ELSE",             SYM(ELSE)},
   { "ELSEIF",           SYM(ELSEIF_SYM)},
+  { "ELSIF",            SYM(ELSIF_SYM)},
   { "ENABLE",		SYM(ENABLE_SYM)},
   { "ENCLOSED",		SYM(ENCLOSED)},
   { "END",		SYM(END)},

sql/sql_yacc.yy

@@ -1068,6 +1068,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  EACH_SYM                      /* SQL-2003-R */
 %token  ELSE                          /* SQL-2003-R */
 %token  ELSEIF_SYM
+%token  ELSIF_SYM                     /* Oracle, reserved in PL/SQL*/
 %token  ENABLE_SYM
 %token  ENCLOSED
 %token  END                           /* SQL-2003-R */
@@ -14340,6 +14341,7 @@ keyword_sp:
         | DUMPFILE                 {}
         | DUPLICATE_SYM            {}
         | DYNAMIC_SYM              {}
+        | ELSIF_SYM                {}
         | ENDS_SYM                 {}
         | ENUM                     {}
         | ENGINE_SYM               {}

sql/sql_yacc_ora.yy

@@ -442,6 +442,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  EACH_SYM                      /* SQL-2003-R */
 %token  ELSE                          /* SQL-2003-R */
 %token  ELSEIF_SYM
+%token  ELSIF_SYM                     /* Oracle, reserved in PL/SQL*/
 %token  ENABLE_SYM
 %token  ENCLOSED
 %token  END                           /* SQL-2003-R */
@@ -3131,7 +3132,7 @@ sp_if:
 
 sp_elseifs:
           /* Empty */
-        | ELSEIF_SYM sp_if
+        | ELSIF_SYM sp_if
         | ELSE sp_proc_stmts1
         ;