statement = if_expression
;
if_expression = `if` `(` condition `;` expression `;` expression `)`
;
condition = disjunction { `or` disjunction }
;
disjunction = conjunction { `and` conjunction }
;
conjunction = `(` condition `)`
| comparison
;
comparison = value (`=` | `<>` | `>` | `<` | `>=` | `<=`) value
;
expression = value
| if_expression
;
value = NUMBER
| NULL
;
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