AND should have higher precedence than OR in predicate expression

[LantaoJin]

Description

In SQL, AND has higher precedence than OR.
Example:

SELECT *
FROM employees
WHERE department = 'HR'
   OR job_title = 'Manager'
   AND salary > 50000;

In this query, the AND between job_title = 'Manager' and salary > 50000 is evaluated first, because AND has higher precedence than OR. It equals to

WHERE department = 'HR'
   OR (job_title = 'Manager' AND salary > 50000);

But in PPL, this query will be evaluated with wrong order:

source=employees
| where department = 'HR' OR job_title = 'Manager' AND salary > 50000

was evaluated to

source=employees
| where (department = 'HR' OR job_title = 'Manager') AND salary > 50000

Issues Resolved

Resolve #770

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