NobiGo commented on a change in pull request #2447:
URL: https://github.com/apache/calcite/pull/2447#discussion_r671583199
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File path:
core/src/main/java/org/apache/calcite/adapter/enumerable/RexImpTable.java
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@@ -1241,6 +1243,83 @@ public static Expression multiplyDivide(Expression e,
BigDecimal multiplier,
}
}
+ /** Implementor for the {@code MODE} aggregate function. */
+ static class ModeImplementor extends StrictAggImplementor {
+ @Override protected void implementNotNullReset(AggContext info,
+ AggResetContext reset) {
+ // acc[0] = null;
+ reset.currentBlock().add(
+ Expressions.statement(
+ Expressions.assign(reset.accumulator().get(0),
+ Expressions.constant(null))));
+ // acc[1] = new HashMap<>();
+ reset.currentBlock().add(
+ Expressions.statement(
+ Expressions.assign(reset.accumulator().get(1),
+ Expressions.new_(HashMap.class))));
+ // acc[2] = Long.valueOf(0);
+ reset.currentBlock().add(
+ Expressions.statement(
+ Expressions.assign(reset.accumulator().get(2),
+ Expressions.constant(0, Long.class))));
+ }
+
+ @Override protected void implementNotNullAdd(AggContext info,
+ AggAddContext add) {
+ Expression currentArg = add.arguments().get(0);
Review comment:
arguments method just can get the column value. So I don't add a comment
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