jackylee-ch opened a new pull request, #9569:
URL: https://github.com/apache/paimon/pull/9569
### Purpose
A variant extraction path is encoded into the projected field's description
as `__VARIANT_METADATA<path>;<failOnError>;<timeZoneId>` and split back on `;`
with no escaping. `VariantPathSegment` allows `;` in a key, so `$.a;b` decodes
as path `$.a` with `failOnError=false` and `ZoneId.of("true")`, while
`$.a;true;UTC` re-splits into a valid triple and reads a different field.
Skip the pushdown for such paths, and assert the invariant in the encoder.
The MAP selected-keys path already pairs the same two guards on this delimiter.
### Tests
`VariantMetadataUtilsTest`, `VariantPushDownUtilsTest`.
Written with Claude Code; reasoning and verification are mine.
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