MDEV-10411 Providing compatibility for basic PL/SQL constructs

Part 10: Default variable value: x INT := 10;

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

 SET sql_mode=ORACLE;
+# Testing ":=" to set the default value of a variable
+CREATE FUNCTION f1 () RETURNS NUMBER(10) AS
+a NUMBER(10) := 10;
+BEGIN
+DECLARE
+b NUMBER(10) DEFAULT 3;
+BEGIN
+RETURN a+b;
+END;
+END;
+/
+SELECT f1();
+f1()
+13
+DROP FUNCTION f1;
 # Testing labels
 CREATE FUNCTION f1 (a INT) RETURNS CLOB AS
 BEGIN

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

 SET sql_mode=ORACLE;
 
+--echo # Testing ":=" to set the default value of a variable
+DELIMITER /;
+CREATE FUNCTION f1 () RETURNS NUMBER(10) AS
+  a NUMBER(10) := 10;
+BEGIN
+  DECLARE
+    b NUMBER(10) DEFAULT 3;
+  BEGIN
+    RETURN a+b;
+  END;
+END;
+/
+DELIMITER ;/
+SELECT f1();
+DROP FUNCTION f1;
+
 --echo # Testing labels
 
 DELIMITER /;

sql/sql_yacc_ora.yy

@@ -2851,6 +2851,7 @@ sp_decl_idents:
 sp_opt_default:
           /* Empty */ { $$ = NULL; }
         | DEFAULT expr { $$ = $2; }
+        | SET_VAR expr { $$ = $2; }
         ;
 
 /*