[PL/SQL] fix varray_type_def according to oracle 21 pl/sql language reference (#3890)

Author: langio

sql/plsql/PlSqlParser.g4

@@ -5446,8 +5446,9 @@ table_indexed_by_part
     : (idx1 = INDEXED | idx2 = INDEX) BY type_spec
     ;
 
+//https://docs.oracle.com/en/database/oracle/oracle-database/21/lnpls/collection-variable.html#GUID-89A1863C-65A1-40CF-9392-86E9FDC21BE9
 varray_type_def
-    : (VARRAY | VARYING ARRAY) '(' expression ')' OF type_spec (NOT NULL_)?
+    : (VARRAY | VARYING? ARRAY) '(' expression ')' OF type_spec (NOT NULL_)?
     ;
 
 // Statements

sql/plsql/examples/varray_type_def.sql

@@ -0,0 +1,34 @@
+CREATE OR REPLACE PACKAGE TEST_PKG_LXD
+AS
+-- Package header
+
+PROCEDURE varray_def_test;
+
+END TEST_PKG_LXD;
+
+CREATE OR REPLACE PACKAGE BODY TEST_PKG_LXD
+AS
+-- Package body
+-- This test case passed on 'Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production'
+
+    PROCEDURE varray_def_test
+    IS
+        -- All of these varray definition are valid
+        TYPE type_array1 IS VARRAY(5) OF PLS_INTEGER;
+        TYPE type_array2 IS VARYING ARRAY(5) OF PLS_INTEGER;
+        TYPE type_array3 IS VARRAY(5) OF PLS_INTEGER;
+
+        array1 type_array1;
+        array2 type_array2;
+        array3 type_array3;
+    BEGIN
+
+        array1 := type_array1(1);
+        array2 := type_array2(2);
+        array3 := type_array3(3);
+
+        dbms_output.put_line('v1=' || array1(1) || ', v2=' || array2(1) || ', v3=' || array3(1));
+
+    END varray_def_test;
+
+END TEST_PKG_LXD;