zenoyang opened a new pull request #8627:
URL: https://github.com/apache/incubator-doris/pull/8627
# Proposed changes
Code optimization and refactoring for low-cardinality columns in storage
layer.
## Problem Summary:
Optimization:
- Add `dict_code` member variable to the predicate. Before the predicate is
calculated, the conversion of the predicate constant into the dictionary code
only needs to be done once
Refactor:
- Add `PredicateType` enum, add `type` method to the predicate, which is
used to represent the predicate type, instead of the original less flexible
way, for example: `is_in_predicate()` ...
- Added the following interface to `IColumn` to simplify the code of the
storage layer and avoid exposing the specific type of column:
- `convert_to_predicate_column_if_dictionary`
- `convert_dict_codes_if_necessary`
- `set_predicate_dict_code_if_necessary`
- Class member variables start with an underscore
- Specify the `int` type only supported by the specialized
`ColumnDictionary` template
In addition to this, there are some priorities that I will provide in the
coming period.
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