RDD Storage Info for *(2) Sort [year#94328492 ASC NULLS FIRST], true, 0
+- Exchange rangepartitioning(year#94328492 ASC NULLS FIRST, 200), ENSURE_REQUIREMENTS, [id=#7531340]
+- *(1) Project [year#94328492, turnover#94328540, (1.0 / cast(turnover#94328540 as double)) AS days_hold#94328575]
+- *(1) Filter isnotnull(turnover#94328540)
+- *(1) ColumnarToRow
+- InMemoryTableScan [turnover#94328540, year#94328492], [isnotnull(turnover#94328540)]
+- InMemoryRelation [year#94328492, retIC#94328494, resretIC#94328496, numcos#94328498, numdates#94328500, annual_bmret#94328502, annual_ret#94328504, std_ret#94328506, Sharpe_ret#94328508, PctPos_ret#94328510, TR_ret#94328512, IR_ret#94328514, annual_resret#94328516, std_resret#94328518, Sharpe_resret#94328520, PctPos_resret#94328522, TR_resret#94328524, IR_resret#94328526, annual_retnet#94328528, std_retnet#94328530, Sharpe_retnet#94328532, PctPos_retnet#94328534, TR_retnet#94328536, IR_retnet#94328538, turnover#94328540], StorageLevel(disk, ...