wuchong commented on a change in pull request #12260:
URL: https://github.com/apache/flink/pull/12260#discussion_r428601204
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/sources/TableSourceUtil.scala
##########
@@ -238,6 +250,14 @@ object TableSourceUtil {
}
}
+ private def containsTimeAttribute(tableSchema: TableSchema): Boolean = {
+ tableSchema.getWatermarkSpecs.nonEmpty ||
tableSchema.getTableColumns.exists(isProctime)
+ }
+
+ private def isProctime(column: TableColumn): Boolean = {
+ toScala(column.getExpr).exists(_.equalsIgnoreCase("proctime()"))
+ }
Review comment:
I think this is error-prone. The string compare is not a general
solution, I can come up with some corner cases:
```
`proctime()` // quoted
proctime // function identifier
```
I think a more general solution is pass a `SqlExprToRexConverterFactory`
(which can creates a `SqlExprToRexConverter` to get the correct type of an
expression) into the `CatalogSchemaTable`. I know it's verbose to pass it into
`CatalogSchemaTable`, but I don't find other reasonable ways.
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