Antlr4 grammar ambiguity for two same prefixed rules

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So I have the following grammar rules for an SQL expression editor (simplified):

FUNCTIONID: 'sum' | 'avg';
functionExpr: FUNCTIONID '(' expr ')'

AGGFUNCTIONID: 'sum' | 'avg'
aggFunctionExpr: AGGFUNCTIONID '(' expr ')' 'over' ...

The code works for expressions such as "sum(1) over ..." but not when there's no over.

How could I make this grammar work for both cases and still have these two rules?

asked 47 secs ago

escanda

1

Antlr4 grammar ambiguity for two same prefixed rules