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| (1,2) = (1,NULL) |
|---|
| null |
| ((1,2),1) = ((1,CAST(NULL AS INT)),1) |
|---|
| null |
| ((1,2),1) = ((1,NULL),1) |
|---|
| null |
| ((1,2),CAST(NULL AS INT)) = ((1,CAST(NULL AS INT)),1) |
|---|
| null |
| ((1,2),null) = ((1,null),1) |
|---|
| null |