linrrzqqq opened a new pull request, #65483:
URL: https://github.com/apache/doris/pull/65483
Problem Summary:
### Background
`bitmap_count(bitmap_op(...))` currently materializes an intermediate bitmap
before counting. For patterns such as `bitmap_count(bitmap_and(...))`,
`bitmap_count(bitmap_or(...))`, `bitmap_count(bitmap_xor(...))`, and
`bitmap_count(bitmap_and_not(...))`, Doris already has corresponding
`bitmap_*_count` functions that can compute the cardinality directly.
Also, `bitmap_and_count`, `bitmap_or_count`, `bitmap_xor_count`, and
`bitmap_and_not_count` are semantically always not null, but their previous
metadata could be marked nullable when bitmap arguments were nullable.
### Changes
- Add Nereids expression rewrite:
- `bitmap_count(bitmap_and(...))` -> `bitmap_and_count(...)`
- `bitmap_count(bitmap_or(...))` -> `bitmap_or_count(...)`
- `bitmap_count(bitmap_xor(...))` -> `bitmap_xor_count(...)`
- `bitmap_count(bitmap_not(...))` / `bitmap_and_not(...)` ->
`bitmap_and_not_count(...)`
- Mark bitmap op count scalar functions as always not nullable in Nereids.
- Add BE v2 implementations for bitmap op count return type inference:
- `bitmap_and_count_v2`
- `bitmap_or_count_v2`
- `bitmap_xor_count_v2`
- `bitmap_and_not_count_v2`
- Add `new_version_bitmap_op_count` query option to select the v2 BE
implementations.
- Optimize binary bitmap count execution paths to avoid intermediate bitmap
materialization.
- Fix `BitmapValue::or_cardinality` for SET/SET input.
- Merge `bitmap_and_not` / `bitmap_andnot` aliases into `bitmap_not`.
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