wuchong commented on a change in pull request #9994: [FLINK-14322][table-api]
Add watermark information in TableSchema
URL: https://github.com/apache/flink/pull/9994#discussion_r340485069
##########
File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/api/TableSchema.java
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@@ -343,13 +396,30 @@ public Builder field(String name, TypeInformation<?>
typeInfo) {
return field(name, fromLegacyInfoToDataType(typeInfo));
}
+ /**
+ * Specifies the previously defined field as an event-time
attribute and specifies the watermark strategy.
+ *
+ * @param rowtimeAttribute the field name as a rowtime
attribute, can be a nested field using dot separator.
+ * @param watermarkStrategy the watermark strategy expression
+ */
+ public Builder watermark(String rowtimeAttribute,
ResolvedExpression watermarkStrategy) {
Review comment:
We will provide some API to `Schema` to define watermark, for example,
`Schema.watermark("ts", 'ts - 5.seconds)`, then the planner will convert the
unresolved expression to resolved expression using the function catalog, and
then create the `TableSchema` by planner.
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