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https://issues.apache.org/jira/browse/FLINK-9999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16577232#comment-16577232
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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_r209430879
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/stringExpressions.scala
##########
@@ -358,6 +358,29 @@ case class Rpad(text: Expression, len: Expression, pad:
Expression)
}
}
+case class IsNumeric(child: Expression) extends UnaryExpression with
InputTypeSpec {
+
+ override private[flink] def expectedTypes: Seq[TypeInformation[_]] =
Seq(STRING_TYPE_INFO)
+
+ override private[flink] def resultType: TypeInformation[_] = INT_TYPE_INFO
+
+ override private[flink] def validateInput(): ValidationResult = {
+ if (child.resultType == STRING_TYPE_INFO) {
Review comment:
Wasn't sure if there is a SQL standard for `isNumeric` but some SQL servers
such as MS and Transact do support `isNumeric(expression)` where expression can
actually be a Numeric type (INT, BIGINT, DOUBLE, etc). Maybe @twalthr have more
context ?
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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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