presto-parser/src/main/java/io/prestosql/sql/tree/ColumnDefinition.java/ColumnDefinition/equals
class ColumnDefinition:    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        ColumnDefinition o = (ColumnDefinition) obj;
        return Objects.equals(this.name, o.name) &&
                Objects.equals(this.type, o.type) &&
                this.nullable == o.nullable &&
                Objects.equals(properties, o.properties) &&
                Objects.equals(this.comment, o.comment);
    }