miland-db opened a new pull request, #48795:
URL: https://github.com/apache/spark/pull/48795
### What changes were proposed in this pull request?
We are introducing checks for unique label names.
New rules for label names:
- Labels can't have the same name as some of the labels in scope surrounding
them
- Labels can have the same name as other labels in the same scope
**Valid** code:
```
BEGIN
lbl: BEGIN
SELECT 1;
END;
lbl: BEGIN
SELECT 2;
END;
BEGIN
lbl: WHILE 1=1 DO
LEAVE lbl;
END WHILE;
END;
END
```
**Invalid** code:
```
BEGIN
lbl: BEGIN
lbl: BEGIN
SELECT 1;
END;
END;
END
```
### Why are the changes needed?
It will be needed in future when we release Local Scoped Variables for SQL
Scripting so users can target variables from outer scopes if they are shadowed.
### How was this patch tested?
New unit tests in 'SqlScriptingParserSuite.scala'.
### Was this patch authored or co-authored using generative AI tooling?
No.
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