Wrong result by SQL Lab in Superset

[uedahiro4]

In SQL Lab in Superset, it replies zero result if you add the condition such as

SELECT *
FROM xapi_statements
WHERE "statement.actor.account.name" = 'admin';

But, below query replies all the record of all the record.

SELECT *
FROM xapi_statements;

Is this the bug of Superset?

[uedahiro4]

When replace = with 'LIKE', got excepted result. But I think this is strange.