Mihailo Milosevic created SPARK-52709:
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Summary: 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
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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