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[feature](reader) Optimize Complex Type Column Reading with Column Puning - #59249
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…uning (apache#57204) Problem Summary: Optimize Complex Type Column Reading with Column Pruning This PR implements column pruning for complex types (Struct, Array, Map) to optimize read performance. Previously, Doris would read entire complex type fields before processing, which was simple to implement but inefficient when only specific sub-columns were needed. **Key changes:** - **FE (Frontend)**: Added column access path calculation and type pruning - Collects and analyzes access paths for complex type fields - Performs type pruning based on access paths - Implements projection pushdown for complex types - **BE (Backend)**: Added selective column reading - Uses columnAccessPath array from FE to identify required sub-columns - Implements selective reading to skip unnecessary sub-columns **Performance Improvement**: When a struct contains hundreds or thousands of columns but the query only accesses a few sub-columns, this optimization can significantly reduce I/O and improve query performance. For example, with `struct<int a, int b> s`, when only `s.a` is referenced, we can avoid reading `s.b` entirely. **Technical Benefits**: Reduces unnecessary data scanning and decoding overhead for complex types, aligning with Doris's continuous performance optimization goals . - **Lazy Materialization for Complex Type Sub-columns**: Defer materialization of unused sub-columns - **Predicate Pushdown for Complex Type Sub-columns**: Push predicates to storage layer for better filtering - **Parquet RL/DL Optimization**: Read only repetition levels and definition levels without data in appropriate scenarios - **Array Size Optimization**: Read only offset and null values for `array_size()` operations - **Null Check Optimization**: Read only offset and null values for `!= null` checks Co-authored-by: 924060929 <lanhuajian@selectdb.com> Co-authored-by: Jerry Hu <mrhhsg@gmail.com>
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What problem does this PR solve?
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Release note
Cherry-pick #57204#58719
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