abhishekagarwal87 commented on code in PR #13508:
URL: https://github.com/apache/druid/pull/13508#discussion_r1040849799
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extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/theta/sql/ThetaSketchSetBaseOperatorConversion.java:
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@@ -63,6 +63,8 @@ public DruidExpression toDruidExpression(
RexNode rexNode
)
{
+ plannerContext.setPlanningError("%s can only be used on aggregates. " +
+ "It cannot be used directly on a column or or on a scalar
expression.", getFunctionName());
Review Comment:
the type check is already done. This tells the user that they are trying to
use the function as an expression while its only available as a post
aggregator.
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