chaokunyang opened a new pull request, #1603:
URL: https://github.com/apache/incubator-fury/pull/1603
## What does this PR do?
Update type meta field info spec:
```
- field info:
- header(8
bits): `3 bits size + 2 bits field name encoding + polymorphism flag +
nullability flag + ref tracking flag`.
Users can use annotation to provide those info.
- 2 bits field name encoding:
- encoding:
`UTF8/ALL_TO_LOWER_SPECIAL/LOWER_UPPER_DIGIT_SPECIAL/TAG_ID`
- If tag id is used, i.e. field name is written by an unsigned
varint tag id. 2 bits encoding will be `11`.
- size of field name:
- The `3 bits size: 0~7` will be used to indicate length `1~7`,
the value `7` indicates to read more bytes,
the encoding will encode `size - 7` as a varint next.
- If encoding is `TAG_ID`, then num_bytes of field name will be
used to store tag id.
- ref tracking: when set to 1, ref tracking will be enabled for this
field.
- nullability: when set to 1, this field can be null.
- polymorphism: when set to 1, the actual type of field will be the
declared field type even the type if
not `final`.
- field name: If tag id is set, tag id will be used instead. Otherwise
meta string encoding `[length]` and data will
be written instead.
```
## Related issues
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## Does this PR introduce any user-facing change?
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- [ ] Does this PR introduce any public API change?
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