pdeva opened a new issue #8643: incorrect result when using `NULLIF` in sql URL: https://github.com/apache/incubator-druid/issues/8643 ### Affected Version 0.16 using default settings for sql (that is no sql specific settings applied) ### Description This expression: ```sql SELECT (SUM(totalTime)/ SUM(thp)) as avgTime FROM "xx" ``` results in: ``` Unknown exception / / by zero / java.lang.ArithmeticException ``` However, this expression: ```sql SELECT (SUM(totalTime)/ NULLIF(SUM(thp),0)) as avgTime FROM "xx" ``` results in `0`. In the second expression, either: 1. the divisor is being replaced to `0` due to the `nullif`, so dividing by `0` should result in an exception 2. druid is replacing the `null` with a `0`, which should still result in a `divide by zero exception` like the first expression above. either way, this expression should be throwing an exception, but it somehow returns `0`. this is the `explain` for the latter sql: ```js { "queryType": "timeseries", "dataSource": { "type": "table", "name": "xx" }, "intervals": { "type": "intervals", "intervals": [ "-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z" ] }, "descending": false, "virtualColumns": [], "filter": null, "granularity": { "type": "all" }, "aggregations": [ { "type": "longSum", "name": "a0", "fieldName": "totalTime", "expression": null }, { "type": "longSum", "name": "a1", "fieldName": "thp", "expression": null } ], "postAggregations": [ { "type": "expression", "name": "p0", "expression": "(\"a0\" / case_searched((\"a1\" == 0),null,\"a1\"))", "ordering": null } ], "limit": 2147483647, "context": { "skipEmptyBuckets": true, "sqlQueryId": "6e5ac469-3b69-40e2-b84a-d5d0c873b9ef" } } ```
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