Return command parses the aliasParameter incorrectly

[51-code]

Describe the bug

The aliasParameter (a=b) in return command has a bug. The first part ("a") is parsed as a fieldType and then the parse fails. The grammar matches it to the required FieldType and then fails, as an equals sign is not allowed after it.

Expected behavior

Should parse.

How to reproduce

Print the parse tree for the following query:
| return 2 foo=fuu

Screenshots

Software version

6.1.0

Desktop (please complete the following information if relevant):

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Additional context

returnSyntaxParseTest in ReturnSyntaxTests.java has been disabled because of this issue in PR #52.