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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2018/02/28 15:40:00 UTC
[jira] [Assigned] (SPARK-23525) ALTER TABLE CHANGE COLUMN doesn't
work for external hive table
[ https://issues.apache.org/jira/browse/SPARK-23525?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-23525:
------------------------------------
Assignee: (was: Apache Spark)
> ALTER TABLE CHANGE COLUMN doesn't work for external hive table
> --------------------------------------------------------------
>
> Key: SPARK-23525
> URL: https://issues.apache.org/jira/browse/SPARK-23525
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0, 2.3.0
> Reporter: Pavlo Skliar
> Priority: Major
>
> {code:java}
> print(spark.sql("""
> SHOW CREATE TABLE test.trends
> """).collect()[0].createtab_stmt)
> /// OUTPUT
> CREATE EXTERNAL TABLE `test`.`trends`(`id` string COMMENT '', `metric` string COMMENT '', `amount` bigint COMMENT '')
> COMMENT ''
> PARTITIONED BY (`date` string COMMENT '')
> ROW FORMAT SERDE 'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe'
> WITH SERDEPROPERTIES (
> 'serialization.format' = '1'
> )
> STORED AS
> INPUTFORMAT 'org.apache.hadoop.hive.ql.io.parquet.MapredParquetInputFormat'
> OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormat'
> LOCATION 's3://xxxxx/xxxxx/xxxx'
> TBLPROPERTIES (
> 'transient_lastDdlTime' = '1519729384',
> 'last_modified_time' = '1519645652',
> 'last_modified_by' = 'pavlo',
> 'last_castor_run_ts' = '1513561658.0'
> )
> spark.sql("""
> DESCRIBE test.trends
> """).collect()
> // OUTPUT
> [Row(col_name='id', data_type='string', comment=''),
> Row(col_name='metric', data_type='string', comment=''),
> Row(col_name='amount', data_type='bigint', comment=''),
> Row(col_name='date', data_type='string', comment=''),
> Row(col_name='# Partition Information', data_type='', comment=''),
> Row(col_name='# col_name', data_type='data_type', comment='comment'),
> Row(col_name='date', data_type='string', comment='')]
> spark.sql("""alter table test.trends change column id id string comment 'unique identifier'""")
> spark.sql("""
> DESCRIBE test.trends
> """).collect()
> // OUTPUT
> [Row(col_name='id', data_type='string', comment=''), Row(col_name='metric', data_type='string', comment=''), Row(col_name='amount', data_type='bigint', comment=''), Row(col_name='date', data_type='string', comment=''), Row(col_name='# Partition Information', data_type='', comment=''), Row(col_name='# col_name', data_type='data_type', comment='comment'), Row(col_name='date', data_type='string', comment='')]
> {code}
> The strange is that I've assigned comment to the id field from hive successfully, and it's visible in Hue UI, but it's still not visible in from spark, and any spark requests doesn't have effect on the comments.
>
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