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scan

duckdb 支持多种scan 类型，

	// -----------------------------
	// Scans
	// -----------------------------
	TABLE_SCAN,
	DUMMY_SCAN,
	COLUMN_DATA_SCAN,
	CHUNK_SCAN,
	RECURSIVE_CTE_SCAN,
	RECURSIVE_RECURRING_CTE_SCAN,
	CTE_SCAN,
	DELIM_SCAN,
	EXPRESSION_SCAN,
	POSITIONAL_SCAN,

execution/operator/scan/physical_column_data_scan.hpp
execution/operator/scan/physical_dummy_scan.hpp
execution/operator/scan/physical_empty_result.hpp
execution/operator/scan/physical_expression_scan.hpp
execution/operator/scan/physical_positional_scan.hpp
execution/operator/scan/physical_table_scan.hpp