Github user shaoxuan-wang commented on a diff in the pull request:
https://github.com/apache/flink/pull/3593#discussion_r107410733
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/aggfunctions/MinAggFunctionWithRetract.scala
---
@@ -212,3 +212,11 @@ class DecimalMinWithRetractAggFunction extends
MinWithRetractAggFunction[BigDeci
override def getInitValue: BigDecimal = BigDecimal.ZERO
override def getValueTypeInfo = BasicTypeInfo.BIG_DEC_TYPE_INFO
}
+
+/**
+ * Built-in String Min with retraction aggregate function
+ */
+class StringMinWithRetractAggFunction extends
MinWithRetractAggFunction[String] {
+ override def getInitValue: String = ""
--- End diff --
remove ": String"?
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