rohangarg commented on code in PR #12472:
URL: https://github.com/apache/druid/pull/12472#discussion_r856362843
##########
processing/src/main/java/org/apache/druid/query/timeboundary/TimeBoundaryQueryQueryToolChest.java:
##########
@@ -224,4 +226,40 @@ public Result<TimeBoundaryResultValue> apply(Object input)
}
};
}
+
+ @Override
+ public RowSignature resultArraySignature(TimeBoundaryQuery query)
+ {
+ if (query.isMinTime() || query.isMaxTime()) {
+ RowSignature.Builder builder = RowSignature.builder();
+ String outputName = query.isMinTime() ?
+
query.getContextValue(TimeBoundaryQuery.MIN_TIME_ARRAY_OUTPUT_NAME,
TimeBoundaryQuery.MIN_TIME) :
+
query.getContextValue(TimeBoundaryQuery.MAX_TIME_ARRAY_OUTPUT_NAME,
TimeBoundaryQuery.MAX_TIME);
+ return builder.add(outputName, ColumnType.LONG).build();
+ }
+ return super.resultArraySignature(query);
Review Comment:
Yes, I'll update the exception to something more meaningful.
Regarding, the handling of min-max part. Yes, the native query returns both
min-max if no bounds given. But in the first implementation, it was becoming a
bit dirty to map the min-max results of a SQL query so decided to throw it for
a start. Will take another stab to see if we can accommodate `SELECT
min(__time), max(__time) from ds` and `SELECT max(__time), min(__time) from ds`
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