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https://issues.apache.org/jira/browse/CALCITE-5922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17754226#comment-17754226
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Julian Hyde commented on CALCITE-5922:
--------------------------------------
Does this bug concern parsing SQL, validating SQL, or generating SQL? You need
to make it clear in the summary.
> POSITION signature incorrect for SparkSQL
> -----------------------------------------
>
> Key: CALCITE-5922
> URL: https://issues.apache.org/jira/browse/CALCITE-5922
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.35.0
> Reporter: hongyu guo
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.36.0
>
>
> In SparkSQL, POSITION(substr, str[, pos]) function only accept
> comma-separated when there are 3 arguments.
> For example:
> {code:java}
> // SparkSQL accepted SQL
> select POSITION('a', 'abc', 1);{code}
> Calcite will use the IN and FROM keyword to separate the input arguments when
> unparsing.
> {code:java}
> // Calcite accepted and unparsed SQL
> select POSITION('a' IN 'abc' FROM 1){code}
> For 2 augument inputs, SparkSQL accept both syntaxes. So I think we should
> write a rule in SparkSqlDialect to convert keyword-separated syntax to
> comma-separted syntax for POSITION function.
>
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