HappenLee opened a new pull request, #64774:
URL: https://github.com/apache/doris/pull/64774
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: Add single-argument MAP aggregate functions sum_map,
avg_map, min_map, max_map, and count_map. These functions aggregate values
independently for each map key and return a MAP. The backend implementation
wraps the existing aggregate function state per key so partial and final
aggregation preserve nested aggregate semantics, including avg state merging.
sum_map and avg_map require numeric map values; min_map, max_map, and count_map
support non-numeric map values, and count_map counts non-null values per key.
### Release note
Add sum_map, avg_map, min_map, max_map, and count_map aggregate functions
for MAP values.
### Check List (For Author)
- Test:
- Build: ./build.sh --fe, ./build.sh --be
- Regression test: ./run-regression-test.sh --run --conf
/tmp/doris-regression-conf-run-path.groovy -d nereids_function_p0/agg_function
-s map_agg_by_key
- Static analysis: ./build-support/run-clang-tidy.sh --files
be/src/exprs/aggregate/aggregate_function_map_combinator.cpp
be/src/exprs/aggregate/aggregate_function_map_combinator.h
be/src/exprs/aggregate/aggregate_function_simple_factory.cpp
- Format: build-support/check-format.sh could not run because local
clang-format is not version 16
- Behavior changed: Yes (adds new aggregate functions)
- Does this need documentation: Yes (new SQL functions; documentation PR not
included)
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