antlr/grammars-v4#4833 Add support for OPTIMIZE TABLES (plural form) to Oracle mysql grammar

[vsantonastaso]

closes #4833

Fixes grammar to accept both OPTIMIZE TABLE (singular) and OPTIMIZE TABLES (plural) syntax, which are both valid in MySQL 8.0+ and 9.0+.

Issue

The Oracle MySQL grammar currently only accepts:

OPTIMIZE TABLE t1;
OPTIMIZE TABLE t1, t2;

But rejects the valid plural form:

OPTIMIZE TABLES t1;
OPTIMIZE TABLES t1, t2;

Error:

line 1:9 mismatched input 'TABLES' expecting {LOCAL_SYMBOL, NO_WRITE_TO_BINLOG_SYMBOL, TABLE_SYMBOL}

Verification

Tested against MySQL 8.0.46 and MySQL 9.0.1 - both forms work correctly:

-- Both forms work in real MySQL
mysql> OPTIMIZE TABLE t1;
+---------------+----------+----------+----------+
| Table         | Op       | Msg_type | Msg_text |
+---------------+----------+----------+----------+
| testdb.t1     | optimize | status   | OK       |
+---------------+----------+----------+----------+
1 row in set (0.02 sec)

mysql> OPTIMIZE TABLES t1;
+---------------+----------+----------+----------+
| Table         | Op       | Msg_type | Msg_text |
+---------------+----------+----------+----------+
| testdb.t1     | optimize | status   | OK       |
+---------------+----------+----------+----------+
1 row in set (0.01 sec)

Verification

Before fix:

OPTIMIZE TABLE t1;   -- ✅ Passes
OPTIMIZE TABLES t1;  -- ❌ Fails with parse error

After fix:

OPTIMIZE TABLE t1;   -- ✅ Passes
OPTIMIZE TABLES t1;  -- ✅ Passes

[vsantonastaso]

@mike-lischke @kaby76 @teverett please take a look at it when you can

[teverett]

@vsantonastaso thanks!