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From "David Nies (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-14044) Newlines in Avro maps cause external table to return corrupt values
Date Fri, 17 Jun 2016 09:04:05 GMT
David Nies created HIVE-14044:
---------------------------------

             Summary: Newlines in Avro maps cause external table to return corrupt values
                 Key: HIVE-14044
                 URL: https://issues.apache.org/jira/browse/HIVE-14044
             Project: Hive
          Issue Type: Bug
         Environment: Hive version: 1.1.0-cdh5.5.1 (bundled with cloudera 5.5.1)
            Reporter: David Nies


When {{\n}} characters are contained in Avro files that are used as data bases for an external
table, the result of {{SELECT}} queries may be corrupt. I encountered this error when querying
hive both from {{beeline}} and from JDBC.

h3. Steps to reproduce (used files are attached to ticket)

# Create an {{.avro}} file that contains newline characters in a value of a map:
{code}
avro-tools fromjson --schema-file test.schema test.json > test.avro
{code}
# Copy {{.avro}} file to HDFS
{code}
hdfs dfs -copyFromLocal test.avro /some/location/
{code}
# Create an external table in beeline containing this {{.avro}}:
{code}
beeline> CREATE EXTERNAL TABLE broken_newline_map
ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.avro.AvroSerDe'
STORED AS
INPUTFORMAT 'org.apache.hadoop.hive.ql.io.avro.AvroContainerInputFormat'
OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.avro.AvroContainerOutputFormat'
LOCATION '/user/dnies/hive-test/broken-newline/db'
TBLPROPERTIES ('avro.schema.literal'='
{
  "type" : "record",
  "name" : "myEntry",
  "namespace" : "myNamespace",
  "fields" : [ {
    "name" : "foo",
    "type" : "long"
  }, {
    "name" : "bar",
    "type" : {
      "type" : "map",
      "values" : "string"
    }
  } ]
}
');
{code}
# Now, selecting may return corrupt results:
{code}
jdbc:my-server:10000/> select * from broken_newline_map;
+-------------------------+---------------------------------------------------+--+
| broken_newline_map.foo  |              broken_newline_map.bar               |
+-------------------------+---------------------------------------------------+--+
| 1                       | {"key2":"value2","key1":"value1\nafter newline"}  |
| 2                       | {"key2":"new value2","key1":"new value"}          |
+-------------------------+---------------------------------------------------+--+
2 rows selected (1.661 seconds)

jdbc:hive2://my-server:10000/> select foo, map_keys(bar), map_values(bar) from broken_newline_map;
+-------+------------------+-----------------------------+--+
|  foo  |       _c1        |             _c2             |
+-------+------------------+-----------------------------+--+
| 1     | ["key2","key1"]  | ["value2","value1"]         |
| NULL  | NULL             | NULL                        |
| 2     | ["key2","key1"]  | ["new value2","new value"]  |
+-------+------------------+-----------------------------+--+
3 rows selected (28.05 seconds)
{code}

Obviously, the last result set contains corrupt entries (line 2). I also encountered this
when doing this query with JDBC. 



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