TSql160Parser misidentifies interval parameter in DATEDIFF function as ColumnReferenceExpression

[sqlrunner]

The TSql160Parser incorrectly identifies the interval parameter in the DATEDIFF function as a ColumnReferenceExpression. This issue occurs when parsing expressions like DATEDIFF(mm, ColA, ColB).

Reproduction Steps:

1. Use the following SQL query: SELECT DATEDIFF(mm, ColA, ColB) FROM my_table;
2. Parse the query using TSql160Parser.
3. Observe that the interval parameter mm is identified as a ColumnReferenceExpression.

Expected Behavior: The interval parameter mm should be identified as a Literal or Identifier, not a ColumnReferenceExpression.

Environment Details:

• SqlScriptDOM version: 161.9142.1
• .NET version: 8.0
• Operating System: Windows 10