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Use RowIdxLayoutReader only when #row_idx is referenced #2650

Job	Run time
remove-bench-label	0s
remove-sql-full-label	0s
remove-sql-label	0s
sql-bench	-1s
remove-gpu-compress-bench-label	-1s
gpu-compress-bench	-1s
bench	-1s
sql-full-bench	-1s
	-5s