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Gabriel
3645dc9430
Problem Summary: Add the file scanner v2 reader stack for external file scans, including native readers for Parquet, CSV/TEXT, JSON, JNI-backed table readers, schema projection, column mapping, predicate handling, reader statistics, page cache support, and related BE/FE integration. This also restores affected Parquet LZO regression cases by adding Doris thirdparty Arrow LZO page decompression support for file scanner v2. Support file scanner v2 readers for external file scan paths, including LZO-compressed Parquet reads in the new Parquet reader path.