Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/2319#discussion_r75998992
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/scala/table/expressionDsl.scala
---
@@ -223,10 +223,28 @@ trait ImplicitExpressionOperations {
*/
def toTime = Cast(expr, SqlTimeTypeInfo.TIME)
- /**
+ /**
* Parses a timestamp String in the form "yy-mm-dd hh:mm:ss.fff" to a
SQL Timestamp.
*/
def toTimestamp = Cast(expr, SqlTimeTypeInfo.TIMESTAMP)
+
+ /**
+ * Accesses the field of a Flink composite type (such as Tuple, POJO,
etc.) by name and
+ * returns it's value.
+ *
+ * @param name name of the field (similar to Flink's field expressions)
+ * @return value of the field
+ */
+ def getField(name: String) = GetCompositeField(expr, name)
--- End diff --
I'm in favor of parsing. Think about `'address$zip` vs
`'address.get('zip)`, the former is more straightforward and shorter. And if
we extend wildcard `'address$*` will be more concise.
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