yanlin-Lynn commented on a change in pull request #1496: [CALCITE-3400] Add
support for interpretering left/right/semi/anti/full join
URL: https://github.com/apache/calcite/pull/1496#discussion_r334229532
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File path: core/src/main/java/org/apache/calcite/interpreter/AggregateNode.java
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@@ -536,6 +539,29 @@ public MinDouble() {
}
}
+ /** Implementation of {@code MIN} function to calculate the minimum of
+ * {@code boolean} values as a user-defined aggregate.
+ */
+ public static class MinBoolean {
Review comment:
For anti join, right input of the join may like this,
```
LogicalAggregate(group=[{0}], agg#0=[MIN($1)])
LogicalProject(X=[$0], $f1=[true])
LogicalValues(tuples=[[{ 1, 'd' }]])
```
so need to calculate the minimum of boolean values, use MinBoolean as a
user-defined aggregate.
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