cshuo commented on a change in pull request #17634:
URL: https://github.com/apache/flink/pull/17634#discussion_r744380537
##########
File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/BuiltInFunctionDefinitions.java
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@@ -759,6 +760,24 @@
explicit(DataTypes.STRING()))))
.build();
+ /**
+ * Special "+" operator used internally by {@code SumAggFunction} to
implement SUM aggregation
+ * on a Decimal type. Uses the {@link
LogicalTypeMerging#findSumAggType(LogicalType)} to avoid
+ * the normal {@link #PLUS} override the special calculation for precision
and scale needed by
+ * SUM.
+ */
+ public static final BuiltInFunctionDefinition PLUS_AGG =
+ BuiltInFunctionDefinition.newBuilder()
+ .name("PLUS_AGG")
Review comment:
`PLUS_AGG` looks like an aggregate function..Maybe
`AGG_PLUS`、`PLUS_FOR_AGG`..
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