[jira] [Created] (AVRO-2885) It is possible to provide a number with decimal digits in an int field

["Federico Ragona (Jira)" <ji...@apache.org>]

Federico Ragona created AVRO-2885:
-------------------------------------

             Summary: It is possible to provide a number with decimal digits in an int field
                 Key: AVRO-2885
                 URL: https://issues.apache.org/jira/browse/AVRO-2885
             Project: Apache Avro
          Issue Type: Bug
          Components: java
    Affects Versions: 1.8.2
            Reporter: Federico Ragona


I defined a schema with an {{int}} field and I'm then using the Java {{GenericDatumReader}} to read records: I have noticed that the reader also accepts numbers with decimal digits and the resulting record contains the same numbers, coerced to integer values. I have observed the same behaviour both when decoding from JSON and from binary. Here is a runnable example:

{code:java}
import org.apache.avro.Schema;
import org.apache.avro.SchemaBuilder;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.io.Decoder;
import org.apache.avro.io.DecoderFactory;

public class AvroIntTest {

    public static GenericRecord readFromJson(Schema schema, String record) throws Exception {
        GenericDatumReader<GenericRecord> reader = new GenericDatumReader<>(schema, schema);
        Decoder decoder = DecoderFactory.get().jsonDecoder(schema, record);
        return reader.read(null, decoder);
    }

    public static void main(String[] args) throws Exception {
        Schema schema = SchemaBuilder
                .builder("test")
                .record("example")
                .fields()
                .requiredInt("id")
                .endRecord();
        String record = "{ \"id\": -1.2 }";

        System.out.println(readFromJson(schema, record)); // prints: { "id": -1 }
    }

}
{code}

The schema generated by the builder looks like this:

{code}
{
  "type" : "record",
  "name" : "example",
  "namespace" : "test",
  "fields" : [ {
    "name" : "id",
    "type" : "int"
  } ]
}
{code}

I would expect the reader to fail because the type of the value doesn't match the type of the field but it instead "silently" succeeds, converting {{-1.2}} to {{-1}}: is this behaviour intended? am I doing something wrong?



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