feat(shredding): support selected-key pushdown by MapSharedShreddingAccessBuilder - #195
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Purpose
Support projecting selected keys from a top-level shared-shredding MAP column as a STRUCT.
This change:
MapSharedShreddingAccessBuilderfor constructing selected-key STRUCT read fields;MapFieldReadPlanto describe the logical output field, physical read field, and materialization behavior;Tests
src/paimon/core/utils/nested_projection_utils_test.cpp
src/paimon/common/data/shredding/map_shared_shredding_schema_utils_test.cpp
src/paimon/common/data/shredding/map_shared_shredding_file_reader_test.cpp
test/inte/write_and_read_inte_test.cpp
API and Format
This change adds the public
MapSharedShreddingAccessBuilderAPI underinclude/paimon.