Incorrect handling of leading zeroes during INSERT

[evillique]

How to reproduce

CREATE TABLE EMPLOYEE
(
    `empId` INTEGER PRIMARY KEY,
    `d` DOUBLE
)
ENGINE = MergeTree
ORDER BY empId;

INSERT INTO EMPLOYEE VALUES (0001, 1.456), (0005, 45.98), (0008, 4342.766), (0017, 345.87), (0021, 43.78), (0051, 0.781);

SELECT * FROM EMPLOYEE;

Results into

┌─empId─┬────────d─┐
│     1 │    1.456 │
│     5 │    45.98 │
│     8 │ 4342.766 │
│    15 │   345.87 │
│    17 │    43.78 │
│    41 │    0.781 │
└───────┴──────────┘

Expected behavior

┌─empId─┬────────d─┐
│     1 │    1.456 │
│     5 │    45.98 │
│     8 │ 4342.766 │
│    17 │   345.87 │
│    21 │    43.78 │
│    51 │    0.781 │
└───────┴──────────┘

Reproduces on the latest master:
https://fiddle.clickhouse.com/8d27f2fe-31a8-4af5-a54b-c0d1608886db

[alexey-milovidov]

The numbers are mistakenly parsed as octal. We shouldn't do that - octal numbers are harmful, as well as functions like strto* from C.