Set command requires only one subsearchStatement

[51-code]

Describe the bug

A query like this:
| set diff [|addtotals label=ddd subdddd] [|addtotals label=ddd ssubbbb]

Results in this exception:

line 46:47 mismatched input '[' expecting {BRACKET_R, PIPE, COMMA, GET_FIELD_SINGLE_QUOTED, GET_FIELD_DOUBLE_QUOTED, GET_FIELD_STRING}

So it stops parsing at the second subsearch, returning an incomplete parse tree.

Expected behavior

Should support and always require two subsearches in the command.

How to reproduce

Try the query above and print the parse tree.

Screenshots

Software version

6.1.0

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Additional context