Description

Currently, we only have a connector-level method Connector.isSingleStatementWritesOnly to determine whether the entire connector supports single-statement writes exclusively, that is, whether it only permits execution within auto commit transactions.

However, some connectors have the capability not to be single-statement writes only, but certain statements (such as some non-rollbackable DDL statements) of them should not be placed in non-autocommit transactions. Therefore, the transaction's autocommit context needs to be passed to these connectors, allowing them to determine whether individual statements are permitted in non-autocommit transactions.

This PR refactors the Connector SPI to enable passing autocommit context when starting connector transactions, while maintaining backward compatibility with existing connectors. And then refactor Iceberg connector to accept and maintain autocommit context in IcebergAbstractMetadata on starting Iceberg transaction.

Motivation and Context

Allow connectors (e.g. Iceberg) to determine which statements can be executed as multi-write operations within a single non-autocommit transaction, and which must be treated as single-write only statements in autocommit transactions.

Impact

N/A

Test Plan

• Make sure this refactoring do not affect any existing CI tests

Contributor checklist

• Please make sure your submission complies with our contributing guide, in particular code style and commit standards.
• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
• If release notes are required, they follow the release notes guidelines.
• Adequate tests were added if applicable.
• CI passed.

Release Notes

== NO RELEASE NOTE ==