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https://issues.apache.org/jira/browse/FLINK-26949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Weijie Guo updated FLINK-26949:
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Affects Version/s: 2.1.0
> Add NVL supported in SQL & Table API
> ------------------------------------
>
> Key: FLINK-26949
> URL: https://issues.apache.org/jira/browse/FLINK-26949
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Affects Versions: 2.1.0
> Reporter: dalongliu
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.0.0
>
>
> Returns {{expr2}} if {{expr1}} is {{{}NULL{}}}, or {{expr1}} otherwise.
> Syntax:
> {code:java}
> nvl(expr1, expr2) {code}
> Arguments:
> * {{{}expr1{}}}: An expression of any type.
> * {{{}expr2{}}}: An expression that shares a least common type with
> {{{}expr1{}}}.
> Reutrns:
> The result type is the least common type of the argument types.
> This function is a synonym for {{{}coalesce(expr1, expr2){}}}.
> Examples:
> {code:java}
> > SELECT nvl(NULL, 2);
> 2
> > SELECT nvl(3, 2);
> 3
> {code}
> See more:
> * [Spark|https://spark.apache.org/docs/latest/api/sql/index.html#nvl]
> * [Hive|https://cwiki.apache.org/confluence/display/hive/languagemanual+udf]
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