[DBMON-6299] Fix table name metadata extraction

[eric-weaver]

Fixes an issue where we're missing metadata extraction of tables when table aliases are used.

SELECT events.target_id, events.created_at, source_tickets.title FROM events, tickets AS source_tickets WHERE events.org_id = 123 AND source_tickets.status = 'open' LIMIT 100 | bin/sqllexer -with-metadata
{
  "sql": "SELECT events.target_id, events.created_at, source_tickets.title FROM events, tickets WHERE events.org_id = ? AND source_tickets.status = ? LIMIT ?",
  "metadata": {
    "size": 12,
    "tables": [
      "events"
    ],
    "comments": [],
    "commands": [
      "SELECT"
    ],
    "procedures": []
  }
}

After the fix

echo "SELECT events.target_id, events.created_at, source_tickets.title FROM events, tickets AS source_tickets WHERE events.org_id = 123 AND source_tickets.status = 'open' LIMIT 100" | bin/sqllexer -with-metadata
{
  "sql": "SELECT events.target_id, events.created_at, source_tickets.title FROM events, tickets WHERE events.org_id = ? AND source_tickets.status = ? LIMIT ?",
  "metadata": {
    "size": 19,
    "tables": [
      "events",
      "tickets"
    ],
    "comments": [],
    "commands": [
      "SELECT"
    ],
    "procedures": []
  }
}

[lu-zhengda]

what does the LATERAL keyword do with the fix?

[eric-weaver]

It fixes test failures for lateral-join