incorrect parsing of aggregated field

[kortemik]

Describe the bug

| makeresults count=1 | eval 'estimates(a_b)'=1 | stats max('estimates(a_b)')

results into

java.lang.IllegalStateException: Parser failure on line 1, column 70 due to mismatched input '(' expecting METHOD_AGGREGATE_PARENTHESIS_R
Please check that the query is written correctly. Otherwise, please report this error and include the query used and this error.

Expected behavior
should work

How to reproduce
run query

Screenshots

Software version
pth_07 8.2.0

Desktop (please complete the following information if relevant):

• OS:
• Browser:
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Additional context