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https://issues.apache.org/jira/browse/SPARK-38378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-38378:
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Assignee: (was: Apache Spark)
> ANTLR grammar definition in separate Parser and Lexer files
> -----------------------------------------------------------
>
> Key: SPARK-38378
> URL: https://issues.apache.org/jira/browse/SPARK-38378
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Zhen Li
> Priority: Major
>
> Suggesting to separate the ANTLR grammar defined in `SqlBase.g4` into
> separate parser `SqlBaseParser.g4` and lexer `SqlBaseLexer.g4`.
> Benefits:
> *Gain more flexibility when implementing new SQL features*
> The current ANTLR grammar definition is given as a mixed grammar in the
> `SqlBase.g4` file.
> By separating the lexer and parser, we will be able to use the full power of
> ANTLR parser and lexer grammars. e.g. lexer mode. This will give us more
> flexibility when implementing new SQL features.
> *The code is more clean.*
> Having parser and lexer in different files also keeps the code more explicit
> about which is the parser and which is the lexer.
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