Support sum double type hasn't loss of accuracy

[GYT0313]

Description:

Support sum double type hasn't loss of accuracy

Example:

DROP TAG INDEX IF EXISTS test_index_amount;
DROP TAG IF EXISTS test;

CREATE TAG IF NOT EXISTS test (`amount`  DOUBLE  COMMENT "amount");
CREATE TAG INDEX test_index_amount ON test(amount);

INSERT VERTEX test(amount) VALUES "vid01" : (335230.9285085);
INSERT VERTEX test(amount) VALUES "vid02" : (331031.49107037);

MATCH (v: test) RETURN sum(properties(v).amount) AS amountSum;
+-------------------+
| amountSum         |
+-------------------+
| 666262.4195788701 |
+-------------------+

Sum get result is 666262.4195788701.

In fact, the result is 666262.41957887.

[CPWstatic]

Sorry, this is a known issue of double value. We will try to fix in our next generation big release.