apache/cassandra · error · InvalidConstraintDefinitionException

Constraint was not specified on a column it operates on…

Error message

Constraint %s was not specified on a column it operates on: %s but on: %s

What it means

ColumnConstraints.prepare verifies that SCALAR-type constraints were actually declared on the column they operate on. A scalar constraint carries an explicit columnName; if the constraint's columnName differs from the column it is being attached to, the schema is inconsistent and InvalidConstraintDefinitionException is thrown, showing the expected column and the actual declared one.

Solutions

1. Attach the constraint to the column named in the constraint's target (or change the constraint's target column to match the column it is declared on).
2. Regenerate/fix the schema DDL so each constraint is declared on its own column.
3. Update the schema-building code to set constraint.columnName to the declaring column.

Example fix

// before (constraint built for 'age' but attached to 'height')
ColumnConstraints.of(heightColumn, ageConstraint);
// after
ColumnConstraints.of(ageColumn, ageConstraint);

if (constraint.getConstraintType() == ConstraintType.SCALAR && !column.equals(constraint.columnName))
    throw new IllegalArgumentException("Constraint targets " + constraint.columnName + " but is declared on " + column);

When it happens

Trigger: Preparing schema (CREATE TABLE / ALTER TABLE with constraints) where a scalar constraint is attached to column A but internally references columnName of column B — typically from programmatically built ColumnConstraints or malformed constraint DDL arguments.

Common situations: ORM/schema-builder code that copies constraint objects between columns without updating the constraint's columnName; hand-edited generated DDL; refactoring a table that renamed a column but not the constraint's target.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

• Constraint cannot be defined on the column
• Constraint ' ' can be used only for columns of type but it…
• Constraint does not accept any arguments.
• constraint can not be specified on a key column
• There are duplicate constraint definitions on column

AI-assisted analysis of apache/cassandra@88fd0f6a0e (2026-09-10). Data as JSON: /api/errors/2668a5fd1d957d0e. Report an issue: GitHub.

Appendix: source

Thrown at src/java/org/apache/cassandra/cql3/constraints/ColumnConstraints.java:247

        public Raw()
        {
            this.constraints = Collections.emptyList();
        }

        public ColumnConstraints prepare(ColumnIdentifier column)
        {
            if (constraints.isEmpty())
                return NO_OP;

            for (ColumnConstraint<?> constraint : constraints)
            {
                // We only check scalar constraints column name, as the rest of the constraints
                // imply the name from the column they are defined at
                if (constraint.getConstraintType() == ConstraintType.SCALAR)
                {
                    if (!column.equals(constraint.columnName))
                    {
                        throw new InvalidConstraintDefinitionException(format("Constraint %s was not specified on a column it operates on: %s but on: %s",
                                                                              constraint, column.toCQLString(), constraint.columnName));
                    }
                }
            }

            ColumnConstraints columnConstraints = new ColumnConstraints(constraints);
            columnConstraints.setColumnName(column);
            return columnConstraints;
        }
    }

    public static class Serializer implements MetadataSerializer<ColumnConstraints>
    {
        @Override
        public void serialize(ColumnConstraints columnConstraint, DataOutputPlus out, Version version) throws IOException
        {
            out.writeInt(columnConstraint.getSize());
            for (ColumnConstraint constraint : columnConstraint.getConstraints())

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