JinkunLiu opened a new pull request, #27330:
URL: https://github.com/apache/flink/pull/27330
## What is the purpose of the change
Introduce Built-in Function to Access field or element in the Variant
SQL Function | Table Function | Description
-- | -- | --
variant ‘[’ INT ‘]’ | VARIANT.at(INT) | If the VARIANT is an ARRAY value,
returns a VARIANT whose value is the element at the specified index. Otherwise,
this operation returns NULL
variant ‘[’ STRING ‘]’ | VARIANT.at(STRING) | If the VARIANT is a MAP value
that has an element with this key, a VARIANT holding the associated value is
returned. Otherwise, NULL is returned.
## Brief change log
- **Support accessing VARIANT elements using [INT] or VARIANT.at(INT) when
the VARIANT contains an ARRAY value in SQL or table expressions.**
- **Support accessing VARIANT elements using ['STRING'] or
VARIANT.at('STRING') when the VARIANT contains a MAP value in SQL or table
expressions.**
## Verifying this change
This change added tests and can be verified as follows:
- *Added six new test at
`org.apache.flink.table.planner.plan.nodes.exec.stream.VariantSemanticTest`*
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
- The S3 file system connector: (no)
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