apache/cassandra · error · InvalidRequestException

Invalid set literal for

Error message

Invalid set literal for %s: value %s is not of type %s

What it means

Fired after the receiver is confirmed a set type: an individual element of the set literal is not assignable to the set's element type (TestResult.NOT_ASSIGNABLE). The message names the column, the offending element, and the expected element type; it is a per-element type validation in set-literal preparation.

Solutions

1. Change the literal element that has the wrong type to match the set's declared element type
2. Alter the column or cast the value so element types are compatible

When it happens

Trigger: Thrown at src/java/org/apache/cassandra/cql3/terms/Sets.java:196 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/cassandra@88fd0f6a0e (2026-09-10). Data as JSON: /api/errors/69637fcc2c6596ef. Report an issue: GitHub.

Appendix: source

Thrown at src/java/org/apache/cassandra/cql3/terms/Sets.java:196

        private void validateAssignableTo(String keyspace, ColumnSpecification receiver) throws InvalidRequestException
        {
            AbstractType<?> type = receiver.type.unwrap();

            if (!(type instanceof SetType))
            {
                // We've parsed empty maps as a set literal to break the ambiguity so
                // handle that case now
                if ((type instanceof MapType) && elements.isEmpty())
                    return;

                throw new InvalidRequestException(String.format("Invalid set literal for %s of type %s", receiver.name, receiver.type.asCQL3Type()));
            }

            ColumnSpecification valueSpec = Sets.valueSpecOf(receiver);
            for (Term.Raw rt : elements)
            {
                if (!rt.testAssignment(keyspace, valueSpec).isAssignable())
                    throw new InvalidRequestException(String.format("Invalid set literal for %s: value %s is not of type %s", receiver.name, rt, valueSpec.type.asCQL3Type()));
            }
        }

        public AssignmentTestable.TestResult testAssignment(String keyspace, ColumnSpecification receiver)
        {
            return testSetAssignment(receiver, elements);
        }

        @Override
        public AbstractType<?> getExactTypeIfKnown(String keyspace)
        {
            return getExactSetTypeIfKnown(elements, p -> p.getExactTypeIfKnown(keyspace));
        }

        @Override
        public AbstractType<?> getCompatibleTypeIfKnown(String keyspace)
        {
            return Sets.getPreferredCompatibleType(elements, p -> p.getCompatibleTypeIfKnown(keyspace));

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