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From "David Mollitor (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-22337) Improve and Expand Text-Based SerDes
Date Wed, 16 Oct 2019 13:38:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-22337?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

David Mollitor updated HIVE-22337:
----------------------------------
    Description: 
* Add new SerDe package just for text-based formats: org.apache.hadoop.hive.serde2.text.*
* Add new SerDe package just for text-based log formats: org.apache.hadoop.hive.serde2.text.log.*
* Create a coherent hierarchy for processing delimited data: AbstractSerDe -> TextSerDe
-> EncodingAwareTextSerde -> DelimitedSerDe -> CsvTextSerDe
* Create a coherent hierarchy for processing regex'ed data: AbstractSerDe -> TextSerDe
-> EncodingAwareTextSerde -> RegexSerDe -> CommonFormatLogSerDe
* Create some standard text processors for super-quick out-of-the-box processing: TSV SerDe
and CSV SerDe
* Create some standard log processors for super-quick out-of-the-box processing: Apache Common
Log Format and Apache Combined Log Format (Apache HTTP Server Log Parsers)
* Better default behaviors for processing text


The default behavior should allow users to quick query data without any failures.
# When a blank line is encountered, insert a 'null' value for each column
# When there are fewer fields in the data than defined in the table schema, shift all available
fields left, and fill in 'null' values for all remaining fields
# When there are too many fields in the data, the last field in the results will contain all
remaining values.  Currently, the data is silently swallows and a warning is issued in the
YARN logs.  A normal user will never see this warning, especially if the job completes successfully.
 Better to (by default) provide them all the data than to hide anything.

{code:none|title=CSV SerDe}
"1,2,3"    = ["1","2","3"]
"1,2,"     = ["1","2",null]
""         = [null,null,null]
"1,2,3,4"  = ["1","2","3,4"]
{code}

  was:
* Add new SerDe package just for text-based formats: org.apache.hadoop.hive.serde2.text.*
* Add new SerDe package just for text-based log formats: org.apache.hadoop.hive.serde2.text.log.*
* Create a coherent hierarchy for processing delimited data: AbstractSerDe -> TextSerDe
-> EncodingAwareTextSerde -> DelimitedSerDe -> CsvTestSerDe
* Create a coherent hierarchy for processing regex'ed data: AbstractSerDe -> TextSerDe
-> EncodingAwareTextSerde -> RegexSerDe -> CommonFormatLogSerDe
* Create some standard text processors for super-quick out-of-the-box processing: TSV SerDe
and CSV SerDe
* Create some standard log processors for super-quick out-of-the-box processing: Apache Common
Log Format and Apache Combined Log Format (Apache HTTP Server Log Parsers)
* Better default behaviors for processing text


The default behavior should allow users to quick query data without any failures.
# When a blank line is encountered, insert a 'null' value for each column
# When there are fewer fields in the data than defined in the table schema, shift all available
fields left, and fill in 'null' values for all remaining fields
# When there are too many fields in the data, the last field in the results will contain all
remaining values.  Currently, the data is silently swallows and a warning is issued in the
YARN logs.  A normal user will never see this warning, especially if the job completes successfully.
 Better to (by default) provide them all the data than to hide anything.

{code:none|title=CSV SerDe}
"1,2,3"    = ["1","2","3"]
"1,2,"     = ["1","2",null]
""         = [null,null,null]
"1,2,3,4"  = ["1","2","3,4"]
{code}


> Improve and Expand Text-Based SerDes
> ------------------------------------
>
>                 Key: HIVE-22337
>                 URL: https://issues.apache.org/jira/browse/HIVE-22337
>             Project: Hive
>          Issue Type: Improvement
>          Components: Serializers/Deserializers
>    Affects Versions: 4.0.0
>            Reporter: David Mollitor
>            Assignee: David Mollitor
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>         Attachments: HIVE-22337.1.patch, HIVE-22337.2.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> * Add new SerDe package just for text-based formats: org.apache.hadoop.hive.serde2.text.*
> * Add new SerDe package just for text-based log formats: org.apache.hadoop.hive.serde2.text.log.*
> * Create a coherent hierarchy for processing delimited data: AbstractSerDe -> TextSerDe
-> EncodingAwareTextSerde -> DelimitedSerDe -> CsvTextSerDe
> * Create a coherent hierarchy for processing regex'ed data: AbstractSerDe -> TextSerDe
-> EncodingAwareTextSerde -> RegexSerDe -> CommonFormatLogSerDe
> * Create some standard text processors for super-quick out-of-the-box processing: TSV
SerDe and CSV SerDe
> * Create some standard log processors for super-quick out-of-the-box processing: Apache
Common Log Format and Apache Combined Log Format (Apache HTTP Server Log Parsers)
> * Better default behaviors for processing text
> The default behavior should allow users to quick query data without any failures.
> # When a blank line is encountered, insert a 'null' value for each column
> # When there are fewer fields in the data than defined in the table schema, shift all
available fields left, and fill in 'null' values for all remaining fields
> # When there are too many fields in the data, the last field in the results will contain
all remaining values.  Currently, the data is silently swallows and a warning is issued in
the YARN logs.  A normal user will never see this warning, especially if the job completes
successfully.  Better to (by default) provide them all the data than to hide anything.
> {code:none|title=CSV SerDe}
> "1,2,3"    = ["1","2","3"]
> "1,2,"     = ["1","2",null]
> ""         = [null,null,null]
> "1,2,3,4"  = ["1","2","3,4"]
> {code}



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