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