Overview

initializeOperationSessionInfo validates the precondition hierarchy lsid -> txnNumber -> autocommit -> startTransaction. The else branch (no autocommit supplied) rejects startTransaction but does not currently reject startOrContinueTransaction, even though both fields are only meaningful inside a multi-document transaction (i.e. with autocommit: false).

Fix

Add a symmetric uassert in initializeOperationSessionInfo that mirrors the existing startTransaction check:

uassert(ErrorCodes::InvalidOptions,
        "'startOrContinueTransaction' field requires 'autocommit' field to also be specified",
        !osi.getStartOrContinueTransaction());

Add a regression test in jstests/core/txns/multi_statement_transaction_command_args.js that exercises the new validation alongside the existing precondition-hierarchy tests.

Acceptance Criteria

• startOrContinueTransaction without autocommit returns InvalidOptions (consistent with startTransaction)
• Regression test in multi_statement_transaction_command_args.js covers the new precondition
• BACKPORT tickets filed for v8.2-staging and v8.0-staging