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https://issues.apache.org/jira/browse/FLINK-9999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16578781#comment-16578781
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ASF GitHub Bot commented on FLINK-9999:
---------------------------------------
walterddr commented on a change in pull request #6473: [FLINK-9999] [table] Add
ISNUMERIC supported in Table API/SQL
URL: https://github.com/apache/flink/pull/6473#discussion_r209719307
##########
File path:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
##########
@@ -450,6 +450,63 @@ class ScalarFunctionsTest extends ScalarTypesTestBase {
"1111111111111111111111111111111111111111111111111111111111111111")
}
+ @Test
+ def testIsNumeric(): Unit = {
Review comment:
Originally what I meant is, since this function only supports
string/varchar, let's have a test that specifies `ISNUMERIC(1L)` throws
`ValidationException`.
Regarding the usage of this in general, I think this is useful to chained
with many other operators with strict type constrains. such as `CASE WHEN
ISNUMERIC(...) THEN ... ELSE ...`, where the `THEN` clause requires some strict
numeric vaues. That's why I was wondering if we should do a better support
beyond just STRING/VARCHAR type.
I will comment on the JIRA actually. thanks for bring this up.
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> Add ISNUMERIC supported in Table API/SQL
> ----------------------------------------
>
> Key: FLINK-9999
> URL: https://issues.apache.org/jira/browse/FLINK-9999
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Major
> Labels: pull-request-available
>
> ISNUMERIC function used to verify a expression is a valid numberic type.
> documentation :
> https://docs.microsoft.com/en-us/sql/t-sql/functions/isnumeric-transact-sql?view=sql-server-2017
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