You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@parquet.apache.org by "Ashish K Singh (JIRA)" <ji...@apache.org> on 2015/04/30 02:06:06 UTC
[jira] [Assigned] (PARQUET-76) Hive cannot determine the list of
columns automatically based on Parquet serde
[ https://issues.apache.org/jira/browse/PARQUET-76?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ashish K Singh reassigned PARQUET-76:
-------------------------------------
Assignee: Ashish K Singh
> Hive cannot determine the list of columns automatically based on Parquet serde
> ------------------------------------------------------------------------------
>
> Key: PARQUET-76
> URL: https://issues.apache.org/jira/browse/PARQUET-76
> Project: Parquet
> Issue Type: New Feature
> Reporter: Pratik Khadloya
> Assignee: Ashish K Singh
> Priority: Critical
>
> Today we are not able to create a parquet based hive table without having to specify the column names and types. When we try to define it the following way, we get the error
> "14/08/20 17:27:46 ERROR ql.Driver: FAILED: SemanticException [Error 10043]: Either list of columns or a custom serializer should be specified"
> {code:sql}
> CREATE TABLE parquet_test
> ROW FORMAT SERDE
> 'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe'
> STORED AS INPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.parquet.MapredParquetInputFormat'
> OUTPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormat'
> LOCATION
> '/user/pratik/campaigns';
> {code}
> Whereas if we create a hive table on top of AVRO based files, we do not need to specify the column names, hive automatically figures out the schema through the SerDe.
> {code:sql}
> CREATE EXTERNAL TABLE campaigns
> ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.avro.AvroSerDe'
> STORED AS INPUTFORMAT 'org.apache.hadoop.hive.ql.io.avro.AvroContainerInputFormat'
> OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.avro.AvroContainerOutputFormat'
> LOCATION '/user/pratik/campaigns'
> TBLPROPERTIES ('avro.schema.url'='hdfs:///user/pratik/campaigns.avsc');
> {code}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)