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https://issues.apache.org/jira/browse/HIVE-3279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420289#comment-13420289
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Ashutosh Chauhan commented on HIVE-3279:
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bq. There's an issue though, because Table.getEmptyTable initializes cols to an
empty array, which of course is not null, causing the above feature to not work
as expected.
I am not sure if this really is the case.
{code}
hive> create table tt (a string) partitioned by (b string);
OK
Time taken: 7.907 seconds
hive> describe tt ;
OK
a string
b string
Time taken: 0.073 seconds
hive> alter table tt add partition(b='part1');
OK
Time taken: 0.848 seconds
hive> describe tt partition (b='part1');
OK
a string
b string
Time taken: 0.071 seconds
hive>
{code}
Above suggests that partition did inherit the columns from table. If the bug as
you described is present, then partition won't have column information?
> Table schema not being copied to Partitions with no columns
> -----------------------------------------------------------
>
> Key: HIVE-3279
> URL: https://issues.apache.org/jira/browse/HIVE-3279
> Project: Hive
> Issue Type: Bug
> Reporter: Travis Crawford
> Assignee: Travis Crawford
>
> Hive has a feature where {{Partition}}'s without any defined columns use the
> {{Table}} schema. This happens in
> {{[Partition.initialize|https://github.com/apache/hive/blob/trunk/ql/src/java/org/apache/hadoop/hive/ql/metadata/Partition.java#L167]}}
> {code}
> // set default if columns are not set
> if (tPartition.getSd().getCols() == null) {
> if (table.getCols() != null) {
> tPartition.getSd().setCols(table.getCols());
> }
> }
> {code}
> There's an issue though, because
> {{[Table.getEmptyTable|https://github.com/apache/hive/blob/trunk/ql/src/java/org/apache/hadoop/hive/ql/metadata/Table.java#L121]}}
> initializes cols to an empty array, which of course is not null, causing the
> above feature to not work as expected.
> I'm not sure of the fix - is there a case where cols can indeed be null? I
> think the best thing to do here is:
> {code}
> - if (tPartition.getSd().getCols() == null) {
> + if (tPartition.getSd().getCols() == null ||
> tPartition.getSd().getCols().size() == 0) {
> {code}
> Thoughts?
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