Eval command "coalesce" doesn't work with just one parameter

[51-code]

Describe the bug

The following query:
index=abc | eval d=coalesce(e)

throws the error:

java.lang.IllegalStateException: Parser failure on line 2, column 29 due to mismatched input ')' expecting EVAL_LANGUAGE_MODE_COMMA
Please check that the query is written correctly. Otherwise, please report this error and include the query used and this error.

This means that it is waiting for a comma. In the grammar it can be seen that at least two parameters are required.

Expected behavior

Just one parameter is enough, which means that the given value is always inserted to the column.

How to reproduce

Run the query above.

Screenshots

Software version

5.11.0

Desktop (please complete the following information if relevant):

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Additional context