morningman opened a new pull request #7939:
URL: https://github.com/apache/incubator-doris/pull/7939
# Proposed changes
Issue Number: close #xxx
## Problem Summary:
This PR mainly changes:
1. Change the define of PBlock
The new PBlock consists of a set of PColumnMeta and a binary buffer.
The PColumnMeta records the metadata information of all columns in the
Block,
while the buffer stores the serialized binary data of all columns.
2. Refactor the serialize/deserizlie method of data type
Rewrite the `serialize()/deserialize()` of IDataType. And also add
a new method `get_uncompressed_serialized_bytes()` to get the total
length
of uncompressed serialized data of a column.
3. Rewrite the serialize/deserizlie method of Block
Now, when serializing a Block to PBlock, it will first get the total
length
of uncompressed serialized data of all columns in this Block, and then
allocate
the memory to write the serialized data to the buffer.
4. Use brpc attachment to transmit the serialized column data
## Checklist(Required)
1. Does it affect the original behavior: (Yes)
The way of transmitting serialized block has been changed
2. Has unit tests been added: (Yes)
3. Has document been added or modified: (No Need)
4. Does it need to update dependencies: (No)
5. Are there any changes that cannot be rolled back: (Yes)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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