Michael Malak created HIVE-4022:
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Summary: Avro SerDe queries don't handle hard-coded nulls for
optional/nullable structs
Key: HIVE-4022
URL: https://issues.apache.org/jira/browse/HIVE-4022
Project: Hive
Issue Type: Bug
Components: Serializers/Deserializers
Reporter: Michael Malak
Related to HIVE-3528,
There is in fact a null-struct test case in line 14 of
https://github.com/apache/hive/blob/15cc604bf10f4c2502cb88fb8bb3dcd45647cf2c/data/files/csv.txt
The test script at
https://github.com/apache/hive/blob/12d6f3e7d21f94e8b8490b7c6d291c9f4cac8a4f/ql/src/test/queries/clientpositive/avro_nullable_fields.q
does indeed work. But in that test, the query gets all of its data from a test
table verbatim:
INSERT OVERWRITE TABLE as_avro SELECT * FROM test_serializer;
If instead we stick in a hard-coded null for the struct directly into the
query, it fails:
INSERT OVERWRITE TABLE as_avro SELECT string1, int1, tinyint1, smallint1,
bigint1, boolean1, float1, double1, list1, map1, null, enum1, nullableint,
bytes1, fixed1 FROM test_serializer;
with the following error:
FAILED: SemanticException [Error 10044]: Line 1:23 Cannot insert into target
table because column number/types are different 'as_avro': Cannot convert
column 10 from void to struct<sint:int,sboolean:boolean,sstring:string>.
Note, though, that substituting a hard-coded null for string1 (and restoring
struct1 into the query) does work:
INSERT OVERWRITE TABLE as_avro SELECT null, int1, tinyint1, smallint1, bigint1,
boolean1, float1, double1, list1, map1, struct1, enum1, nullableint, bytes1,
fixed1 FROM test_serializer;
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