dianfu commented on a change in pull request #7167: [FLINK-10973] [table] Add
support for map to table API
URL: https://github.com/apache/flink/pull/7167#discussion_r236968724
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File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/table.scala
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@@ -999,6 +999,94 @@ class Table(
new OverWindowedTable(this, overWindows.toArray)
}
+ /**
+ * Performs a map operation with an user-defined scalar function or
built-in scalar functions.
+ * The output will be flattened if the output type is a composite type.
+ *
+ * Scala Example:
+ * {{{
+ * class MyMapFunction extends ScalarFunction {
+ * def eval(str: String): Row = {
+ * Row.of(str, str)
+ * }
+ *
+ * def getResultType(signature: Array[Class[_]]): TypeInformation[_] =
+ * Types.ROW(Types.STRING, Types.STRING)
+ * }
+ *
+ * val func = new MyMapFunction()
+ * table.map(func('c))
+ * }}}
+ *
+ * Java Example:
+ * {{{
+ * class MyMapFunction extends ScalarFunction {
+ * public Row eval(String str) {
+ * return Row.of(str, str);
+ * }
+ *
+ * public TypeInformation getResultType(Class[] signature) {
+ * return new RowTypeInfo(BasicTypeInfo.STRING_TYPE_INFO,
BasicTypeInfo.STRING_TYPE_INFO);
Review comment:
What about using the `Types` from `flink-core` module. The scala `Types` is
just a wrapper of the java version `Types` from `flink-core`?
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