Akshat-Jain commented on code in PR #16682:
URL: https://github.com/apache/druid/pull/16682#discussion_r1681068230
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extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/hll/sql/HllSketchBaseSqlAggregator.java:
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@@ -154,6 +155,15 @@ public Aggregation toDruidAggregation(
}
if (inputType.is(ValueType.COMPLEX)) {
+ if (!isValidComplexInputType(inputType)) {
+ plannerContext.setPlanningError(
+ "Using APPROX_COUNT_DISTINCT() or enabling approximation with
COUNT(DISTINCT) is not supported for"
+ + " column type [%s]. You can disable approximation, use
COUNT(DISTINCT %s) and rerun the query.",
+ columnArg.getDruidType(),
+ columnArg.getSimpleExtraction().getColumn()
Review Comment:
Makes sense, made the change.
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