ApoorvGuptaAi commented on issue #13851:
URL: https://github.com/apache/druid/issues/13851#issuecomment-1445431527
Attaching results from a slightly modified query, it can be clearly seen
that accessing the mean_expected column in virtual expression in the top most
query returns null.
```
{
...
"virtualColumns": [
{
"type": "expression",
"name": "diff_of_mean",
"expression": "basesplit.mean_expected - mean_actual",
"outputType": "DOUBLE"
},
{
"type": "expression",
"name": "diff_of_mean_debug_1",
"expression": "basesplit.mean_expected",
"outputType": "DOUBLE"
},
{
"type": "expression",
"name": "diff_of_mean_debug_2",
"expression": "mean_expected",
"outputType": "DOUBLE"
},
],
}
```
```csv
"__time","diff_of_mean","diff_of_mean_debug_1","diff_of_mean_debug_2","sum_actual","count_actual","mean_actual","basesplit.__time","basesplit.sum_expected","basesplit.count_expected","basesplit.mean_expected"
"1664409600000","-643165.1670692185","null","null","1851672515.99228","2879","643165.1670692185","1440720000000","24080990493.740643","40319","597261.6010749434"
"1664496000000","-529102.7366475407","null","null","1523815881.5449173","2880","529102.7366475407","1440720000000","24080990493.740643","40319","597261.6010749434"
"1664582400000","-569473.1718008721","null","null","1640082734.7865114","2880","569473.1718008721","1440720000000","24080990493.740643","40319","597261.6010749434"
"1664668800000","-552417.1615504303","null","null","1590961425.2652395","2880","552417.1615504303","1440720000000","24080990493.740643","40319","597261.6010749434"
"1664755200000","-565688.6536937789","null","null","1629183322.6380832","2880","565688.6536937789","1440720000000","24080990493.740643","40319","597261.6010749434"
"1664841600000","-666414.1523327589","null","null","1919272758.7183456","2880","666414.1523327589","1440720000000","24080990493.740643","40319","597261.6010749434"
"1664928000000","-465871.1106727756","null","null","1341708798.7375937","2880","465871.1106727756","1440720000000","24080990493.740643","40319","597261.6010749434"
"1665014400000","-482558.17478761915","null","null","1389767543.388343","2880","482558.17478761915","1440720000000","24080990493.740643","40319","597261.6010749434"
"1665100800000","-441239.2982682393","null","null","1270769179.0125291","2880","441239.2982682393","1440720000000","24080990493.740643","40319","597261.6010749434"
"1665187200000","-543284.1701650404","null","null","1564658410.0753164","2880","543284.1701650404","1440720000000","24080990493.740643","40319","597261.6010749434"
"1665273600000","-557229.5186876628","null","null","1604821013.8204687","2880","557229.5186876628","1440720000000","24080990493.740643","40319","597261.6010749434"
"1665360000000","-495219.3813783375","null","null","1426231818.369612","2880","495219.3813783375","1440720000000","24080990493.740643","40319","597261.6010749434"
"1665446400000","-471617.48787544563","null","null","1358258365.0812833","2880","471617.48787544563","1440720000000","24080990493.740643","40319","597261.6010749434"
"1665532800000","-605353.4029983195","null","null","1743417800.63516","2880","605353.4029983195","1440720000000","24080990493.740643","40319","597261.6010749434"
"1665619200000","-685076.1327278281","null","null","1973019262.256145","2880","685076.1327278281","1440720000000","24080990493.740643","40319","597261.6010749434"
"1665705600000","-616306.0573581769","null","null","640341993.5951458","1039","616306.0573581769","1440720000000","24080990493.740643","40319","597261.6010749434"
"1676937600000","-608602.4824432421","null","null","49077095581.7406","80639","608602.4824432421","1440720000000","24080990493.740643","40319","597261.6010749434"
```
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