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https://issues.apache.org/jira/browse/SPARK-52709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18005064#comment-18005064
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Mihailo Milosevic commented on SPARK-52709:
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Great. If you need a review please ping me on the PR.
> Fix parsing of STRUCT<>
> -----------------------
>
> Key: SPARK-52709
> URL: https://issues.apache.org/jira/browse/SPARK-52709
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.1.0
> Reporter: Mihailo Milosevic
> Priority: Major
> Labels: starter
>
> Currently spark has wrong logic of STRUCT parsing. We introduce up-count of
> parenthesis for when we see a word STRUCT, not when we see an open
> parentesis. This leads to the problem when we have STRUCT<>. In lexer NEQ is
> before LT, which means that we will match STRUCT and NEQ. In this case we
> would increase the counter, but would never decrease it for the next
> iterations. This leads to the following query failing with syntax error:
> ```
> SELECT cast(null as STRUCT<>), 2 >> 1;
> ```
> This ticket needs to address the issue of spark not knowing how many
> parenthesis are present when empty structs are in the loop.
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