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From "Ashish Thusoo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-192) Cannot create table with timestamp type column
Date Tue, 10 Mar 2009 21:16:50 GMT

    [ https://issues.apache.org/jira/browse/HIVE-192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680621#action_12680621
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Ashish Thusoo commented on HIVE-192:
------------------------------------

I went through the write up and it looks quite comprehensive from the DDL point of view. Here
are a few comments:

1. I think we can drop ON UPDATE all together as we do not support UPDATE in Hive at this
point.
2. auto increment is a nice to have feature since it can be achieved with by providing a now()
UDF in hive, it is definitely a good feature to have though.
3. Would be great if you could also add the UDFs that could be added to timestamps. Mysql
has a bunch of these. Some that directly come to mind are day(ts), month(ts), year(ts) etc,
and to_timestamp function as namit pointed out.

As far as storage is concerned, that would depend on the serde in question...


> Cannot create table with timestamp type column
> ----------------------------------------------
>
>                 Key: HIVE-192
>                 URL: https://issues.apache.org/jira/browse/HIVE-192
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.2.0
>            Reporter: Johan Oskarsson
>            Priority: Blocker
>             Fix For: 0.2.0
>
>         Attachments: TIMESTAMP_specification.txt
>
>
> create table something2 (test timestamp);
> ERROR: DDL specifying type timestamp which has not been defined
> java.lang.RuntimeException: specifying type timestamp which has not been defined
> 	at org.apache.hadoop.hive.serde2.dynamic_type.thrift_grammar.FieldType(thrift_grammar.java:1879)
> 	at org.apache.hadoop.hive.serde2.dynamic_type.thrift_grammar.Field(thrift_grammar.java:1545)
> 	at org.apache.hadoop.hive.serde2.dynamic_type.thrift_grammar.FieldList(thrift_grammar.java:1501)
> 	at org.apache.hadoop.hive.serde2.dynamic_type.thrift_grammar.Struct(thrift_grammar.java:1171)
> 	at org.apache.hadoop.hive.serde2.dynamic_type.thrift_grammar.TypeDefinition(thrift_grammar.java:497)
> 	at org.apache.hadoop.hive.serde2.dynamic_type.thrift_grammar.Definition(thrift_grammar.java:439)
> 	at org.apache.hadoop.hive.serde2.dynamic_type.thrift_grammar.Start(thrift_grammar.java:101)
> 	at org.apache.hadoop.hive.serde2.dynamic_type.DynamicSerDe.initialize(DynamicSerDe.java:97)
> 	at org.apache.hadoop.hive.metastore.MetaStoreUtils.getDeserializer(MetaStoreUtils.java:180)
> 	at org.apache.hadoop.hive.ql.metadata.Table.initSerDe(Table.java:141)
> 	at org.apache.hadoop.hive.ql.metadata.Hive.createTable(Hive.java:202)
> 	at org.apache.hadoop.hive.ql.exec.DDLTask.createTable(DDLTask.java:641)
> 	at org.apache.hadoop.hive.ql.exec.DDLTask.execute(DDLTask.java:98)
> 	at org.apache.hadoop.hive.ql.Driver.run(Driver.java:215)
> 	at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:174)
> 	at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:207)
> 	at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:305)

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