Jonathan Natkins created HIVE-3333:
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Summary: Specified SerDe does not get used when executing a query
over JSON data
Key: HIVE-3333
URL: https://issues.apache.org/jira/browse/HIVE-3333
Project: Hive
Issue Type: Bug
Components: Serializers/Deserializers
Reporter: Jonathan Natkins
Attachments: hive-test-case.tar.gz
I found a JSON SerDe that I wanted to try out, and I ran into some issues
attempting to use it. The script I was executing looks like this:
ADD JAR /home/natty/hive-test-case/hive-json-serde-0.2.jar;
CREATE TABLE bar (
id INT,
integers ARRAY<INT>,
datum STRING
) ROW FORMAT SERDE 'org.apache.hadoop.hive.contrib.serde2.JsonSerde';
LOAD DATA LOCAL INPATH '/home/natty/sample_data/json.sample' OVERWRITE INTO
TABLE bar;
SELECT * FROM bar;
The data I loaded in looks like this:
{ "id": 1, "integers": [ 1, 2, 3 ], "datum": "hello" },
When the "SELECT * FROM bar" query executes, it returns with a failure:
hive> ADD JAR /home/natty/hive-test-case/hive-json-serde-0.2.jar;
Added /home/natty/hive-test-case/hive-json-serde-0.2.jar to class path
Added resource: /home/natty/hive-test-case/hive-json-serde-0.2.jar
hive> SELECT * FROM bar;
OK
Failed with exception java.io.IOException:java.lang.ClassCastException:
org.json.JSONArray cannot be cast to [Ljava.lang.Object;
Time taken: 2.335 seconds
Now, this alone doesn't bother me. What bothers me is that, if I look at the
log file, I see the following exception:
2012-08-03 13:12:11,407 ERROR CliDriver (SessionState.java:printError(380)) -
Failed with exception java.io.IOException:java.lang.ClassCastException:
org.json.JSONArray cannot be cast to [Ljava.lang.Object;
java.io.IOException: java.lang.ClassCastException: org.json.JSONArray cannot be
cast to [Ljava.lang.Object;
at org.apache.hadoop.hive.ql.exec.FetchTask.fetch(FetchTask.java:173)
at org.apache.hadoop.hive.ql.Driver.getResults(Driver.java:1383)
at
org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:266)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:212)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:671)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:554)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:208)
Caused by: java.lang.ClassCastException: org.json.JSONArray cannot be cast to
[Ljava.lang.Object;
at
org.apache.hadoop.hive.serde2.objectinspector.StandardListObjectInspector.getList(StandardListObjectInspector.java:98)
at
org.apache.hadoop.hive.serde2.SerDeUtils.buildJSONString(SerDeUtils.java:287)
at
org.apache.hadoop.hive.serde2.SerDeUtils.getJSONString(SerDeUtils.java:213)
at
org.apache.hadoop.hive.serde2.DelimitedJSONSerDe.serializeField(DelimitedJSONSerDe.java:59)
at
org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serialize(LazySimpleSerDe.java:365)
at org.apache.hadoop.hive.ql.exec.FetchTask.fetch(FetchTask.java:163)
... 11 more
Note that this exception indicates that Hive is executing code for the
DelimitedJSONSerDe, rather than the one that I specified (JsonSerde from the
jar file). Seems incorrect.
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