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https://issues.apache.org/jira/browse/FLINK-9928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16556835#comment-16556835
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ASF GitHub Bot commented on FLINK-9928:
---------------------------------------
xccui commented on a change in pull request #6404: [FLINK-9928] Add LOG2
function for table/sql API
URL: https://github.com/apache/flink/pull/6404#discussion_r205314834
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/mathExpressions.scala
##########
@@ -92,6 +92,18 @@ case class Log10(child: Expression) extends UnaryExpression
with InputTypeSpec {
}
}
+case class Log2(child: Expression) extends UnaryExpression with InputTypeSpec {
+ override private[flink] def expectedTypes: Seq[TypeInformation[_]] =
DOUBLE_TYPE_INFO :: Nil
+
+ override private[flink] def resultType: TypeInformation[_] = DOUBLE_TYPE_INFO
+
+ override private[flink] def toRexNode(implicit relBuilder: RelBuilder) = {
+ relBuilder.call(ScalarSqlFunctions.LOG2, children.map(_.toRexNode))
Review comment:
`relBuilder.call(ScalarSqlFunctions.LOG2, child.toRexNode)`
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> Add LOG2 function for table/sql API
> -----------------------------------
>
> Key: FLINK-9928
> URL: https://issues.apache.org/jira/browse/FLINK-9928
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Minor
> Labels: pull-request-available
>
> refer to :
> https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html#function_log2
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