Add AppendReadCSVListClause for multi-file CSV reads#409
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Variant of AppendReadCSVClause that takes a List of file paths, used for reading multiple CSV files together as one logical input through DuckDB's read_csv([...]). Refactors the shared tail (max_line_size / parallel-disable / columns map / csv-options / closing paren) into AppendReadCSVTail so both the single-path and list variants emit identical output. Signed-off-by: Marco Slot <marco.slot@snowflake.com>
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sfc-gh-okalaci
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Jun 22, 2026
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