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https://issues.apache.org/jira/browse/FLINK-5698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15892474#comment-15892474
]
ASF GitHub Bot commented on FLINK-5698:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3269#discussion_r103960833
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/plan/rules/util/RexProgramProjectExtractorTest.scala
---
@@ -55,6 +56,34 @@ class RexProgramProjectExtractorTest {
}
@Test
+ def testExtractRefNestedInputFields(): Unit = {
+ val rexProgram = buildRexProgramWithNesting()
+ val usedFields = extractRefInputFields(rexProgram)
+ val usedNestedFields = extractRefNestedInputFields(rexProgram,
usedFields)
+ val expected = Array[Array[String]](Array("amount"), Array("*"))
+ assertThat(usedNestedFields, is(expected))
+ }
+
+ @Test
+ def testExtractRefNestedInputFieldsWithNoNesting(): Unit = {
+ val rexProgram = buildRexProgram()
+ val usedFields = extractRefInputFields(rexProgram)
+ val usedNestedFields = extractRefNestedInputFields(rexProgram,
usedFields)
+ val expected = Array[Array[String]](Array("*"), Array("*"), Array("*"))
+ assertThat(usedNestedFields, is(expected))
+ }
+
+ @Test
+ def testExtractDeepRefNestedInputFields(): Unit = {
+ val rexProgram = buildRexProgramWithDeepNesting()
+ val usedFields = extractRefInputFields(rexProgram)
+ val usedNestedFields = extractRefNestedInputFields(rexProgram,
usedFields)
+ val expected = Array[Array[String]](Array("amount"),
Array("passport.status"))
--- End diff --
Another test would be to reference the nested attribute in a call, for
example something like `payments.amount * 10`.
> Add NestedFieldsProjectableTableSource interface
> ------------------------------------------------
>
> Key: FLINK-5698
> URL: https://issues.apache.org/jira/browse/FLINK-5698
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Anton Solovev
> Assignee: Anton Solovev
>
> Add a NestedFieldsProjectableTableSource interface for some TableSource
> implementation that support nesting projection push-down.
> The interface could look as follows
> {code}
> def trait NestedFieldsProjectableTableSource {
> def projectNestedFields(fields: Array[String]):
> NestedFieldsProjectableTableSource[T]
> }
> {code}
> This interface works together with ProjectableTableSource
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