fix(cubesql): Allow NULL values in CASE
#2977
| Job | Run time |
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| 2m 1s | |
| 7m 13s | |
| 21m 4s | |
| 9m 50s | |
| 19m 28s | |
| 9m 49s | |
| 9m 48s | |
| 20m 10s | |
| 10m 9s | |
| 10m 5s | |
| 10m 0s | |
| 10m 12s | |
| 9m 46s | |
| 9m 42s | |
| 10m 0s | |
| 10m 2s | |
| 10m 5s | |
| 9m 49s | |
| 3h 39m 32s |