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https://issues.apache.org/jira/browse/HIVE-3279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420724#comment-13420724
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Travis Crawford commented on HIVE-3279:
---------------------------------------
Applying the above change and rerunning these statements causes the partition
to have dynamically-reported columns:
{code:title=Proposed behavior: partition has correct columns with above change}
hive> create external table int_string
> partitioned by (b string)
> row format serde
"org.apache.hadoop.hive.serde2.thrift.ThriftDeserializer"
> with serdeproperties (
>
"serialization.class"="org.apache.hadoop.hive.serde2.thrift.test.IntString",
> "serialization.format"="org.apache.thrift.protocol.TBinaryProtocol");
OK
Time taken: 0.085 seconds
hive> alter table int_string add partition (b='part1');
OK
Time taken: 0.128 seconds
hive> describe int_string partition (b='part1');
OK
myint int from deserializer
mystring string from deserializer
underscore_int int from deserializer
b string
Time taken: 0.09 seconds
hive>
{code}
> 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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