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Spec: Clarify boolean predicate constants #17120

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Spec: Clarify boolean predicate constants #17120

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5 changes: 4 additions & 1 deletion format/expressions-spec.md
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Expand Up @@ -281,21 +281,24 @@ If a function reference is a list of strings, it is the function identifier and
### Predicates

```
PREDICATE: true | false
PREDICATE: { "type": BOOLEAN_CONST }
| { "type": "not", "child": PREDICATE }
| { "type": BINARY_OP, "left": PREDICATE, "right": PREDICATE }
| { "type": UNARY_OP, "child": EXPR }
| { "type": CMP_OP, "left": EXPR, "right": EXPR }
| { "type": SET_OP, "child": EXPR, "values": LITERALS }
| DEPRECATED_PREDICATE

BOOLEAN_CONST: "true" | "false"
BINARY_OP: "and" | "or"
UNARY_OP: "is-null" | "not-null" | "is-nan" | "not-nan"
CMP_OP: "lt" | "lt-eq" | "gt" | "gt-eq" | "eq" | "not-eq"
| "starts-with" | "not-starts-with"
SET_OP: "in" | "not-in"
```

Boolean predicate constants are serialized as objects to avoid ambiguity with boolean literal values.

### Backward compatibility

Comment on lines +300 to 303
```
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