liyafan82 commented on a change in pull request #2447:
URL: https://github.com/apache/calcite/pull/2447#discussion_r662694899
##########
File path:
core/src/main/java/org/apache/calcite/adapter/enumerable/RexImpTable.java
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@@ -1241,6 +1243,81 @@ 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) {
+
+ reset.currentBlock().add(
+ Expressions.statement(
+ Expressions.assign(reset.accumulator().get(0),
+ Expressions.constant(null))));
+
+ reset.currentBlock().add(
+ Expressions.statement(
+ Expressions.assign(reset.accumulator().get(1),
+ Expressions.new_(HashMap.class))));
+
+ 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 args = add.arguments().get(0);
+
+ Expression accResult = add.accumulator().get(0);
+ Expression accMap = add.accumulator().get(1);
+ Expression accLong = add.accumulator().get(2);
Review comment:
Maybe better variable names could be used here, and some comments could
be added to improve readability.
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