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https://issues.apache.org/jira/browse/SPARK-27949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-27949:
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Assignee: (was: Apache Spark)
> Support ANSI SQL grammar `substring(string_expression from n1 [for n2])`
> ------------------------------------------------------------------------
>
> Key: SPARK-27949
> URL: https://issues.apache.org/jira/browse/SPARK-27949
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Zhu, Lipeng
> Priority: Major
>
> Currently, function substr/substring's usage is like
> substring(string_expression, n1 [,n2]).
> But the ANSI SQL defined the pattern for substr/substring is like
> substring(string_expression from n1 [for n2]). This gap make some
> inconvenient when we switch to the SparkSQL.
> Can we support the ANSI pattern like substring(string_expression from n1 [for
> n2])?
>
> [http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt]
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