Allow to convert float stored in string field to integer in JSONExtract

[CurtizJ]

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Allow to implicitly convert floats stored in string fields of JSON to integers in JSONExtract functions. E.g. JSONExtract('{"a": "1000.111"}', 'a', 'UInt64') -> 1000, previously it returned 0.

[CurtizJ]

Previously there was an inconsistency:

SELECT JSONExtract('{"a": "1000"}', 'a', 'UInt64')

┌─JSONExtract('{"a": "1000"}', 'a', 'UInt64')─┐
│                                        1000 │
└─────────────────────────────────────────────┘

SELECT JSONExtract('{"a": "1000.111"}', 'a', 'UInt64');

┌─JSONExtract('{"a": "1000.111"}', 'a', 'UInt64')─┐
│                                               0 │
└─────────────────────────────────────────────────┘

SELECT JSONExtract('{"a": 1000.111}', 'a', 'UInt64');

┌─JSONExtract('{"a": 1000.111}', 'a', 'UInt64')─┐
│                                          1000 │
└───────────────────────────────────────────────┘