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From "Julien Genini (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-10869) Auto-normalization of semi-structured schema from a dataframe
Date Wed, 30 Sep 2015 08:42:07 GMT

     [ https://issues.apache.org/jira/browse/SPARK-10869?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Julien Genini updated SPARK-10869:
----------------------------------
    Target Version/s:   (was: 1.5.1)

> Auto-normalization of semi-structured schema from a dataframe
> -------------------------------------------------------------
>
>                 Key: SPARK-10869
>                 URL: https://issues.apache.org/jira/browse/SPARK-10869
>             Project: Spark
>          Issue Type: New Feature
>          Components: PySpark
>    Affects Versions: 1.5.1
>            Reporter: Julien Genini
>            Priority: Minor
>   Original Estimate: 4h
>  Remaining Estimate: 4h
>
> today, you can get a multi-depth schema from a semi-structured dataframe. (XML, JSON,
etc..)
> Not so easy to deal in data warehousing where it's better to normalize the data.
> I propose an option to add when you get the schema (normalized, default False)
> Then the returned json schema will contains the normalized path for each field, and the
list of the different node levels
> df = sqlContext.read.json(jsonPath)
> jsonLinearSchema = df.schema.jsonValue(normalized=True)
> >>
> {code}
> {'fields': [{'fullPathName': 'SiteXML.BusinessDate',                            
>              'metadata': {},
>              'name': 'BusinessDate',
>              'nullable': True,
>              'type': 'string'},
>             {'fullPathName': 'SiteXML.Site_List.Site.Id_Group',
>              'metadata': {},
>              'name': 'Id_Group',
>              'nullable': True,
>              'type': 'string'},
>             {'fullPathName': 'SiteXML.Site_List.Site.Id_Site',
>              'metadata': {},
>              'name': 'Id_Site',
>              'nullable': True,
>              'type': 'string'},
>             {'fullPathName': 'SiteXML.Site_List.Site.libelle',
>              'metadata': {},
>              'name': 'libelle',
>              'nullable': True,
>              'type': 'string'},
>             {'fullPathName': 'SiteXML.Site_List.Site.libelle_Group',
>              'metadata': {},
>              'name': 'libelle_Group',
>              'nullable': True,
>              'type': 'string'},
>             {'fullPathName': 'SiteXML.TimeStamp',
>              'metadata': {},
>              'name': 'TimeStamp',
>              'nullable': True,
>              'type': 'string'}],
>  'nodes': [{'fieldsFullPathName': ['SiteXML.BusinessDate',
>                                    'SiteXML.TimeStamp'],
>             'fullPathName': 'SiteXML',
>             'nbFields': 2},
>            {'fieldsFullPathName': ['SiteXML.Site_List.Site.Id_Group',
>                                    'SiteXML.Site_List.Site.Id_Site',
>                                    'SiteXML.Site_List.Site.libelle',
>                                    'SiteXML.Site_List.Site.libelle_Group'],
>             'fullPathName': 'SiteXML.Site_List.Site',
>             'nbFields': 4}]}
> {code}



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