Cheng Lian created HIVE-11625:
---------------------------------
Summary: Map instances with null keys are not written to Parquet
tables
Key: HIVE-11625
URL: https://issues.apache.org/jira/browse/HIVE-11625
Project: Hive
Issue Type: Bug
Affects Versions: 1.2.1, 1.1.1, 1.0.1, 0.13.1, 0.14.0
Reporter: Cheng Lian
Hive allows maps with null keys:
{code:sql}
hive> select map(null, 'foo', 1, 'bar', null, 'baz');
{null:"baz",1:"bar"}
{code}
However, when written into Parquet tables, map entries with null as keys are
dropped:
{code:sql}
hive> CREATE TABLE map_test STORED AS PARQUET
> AS SELECT MAP(null, 'foo', 1, 'bar', null, 'baz');
...
hive> SELECT * from map_test;
{1:"bar"}
{code}
This is because entries with null keys are explicitly skipped in
{{DataWritableWriter}}, [see
here|https://github.com/apache/hive/blob/release-1.2.1/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/write/DataWritableWriter.java#L223-L237].
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