Comment filtre basé sur le tableau de la valeur dans PySpark?

Mon Schéma:

|-- Canonical_URL: string (nullable = true)
 |-- Certifications: array (nullable = true)
 |    |-- element: struct (containsNull = true)
 |    |    |-- Certification_Authority: string (nullable = true)
 |    |    |-- End: string (nullable = true)
 |    |    |-- License: string (nullable = true)
 |    |    |-- Start: string (nullable = true)
 |    |    |-- Title: string (nullable = true)
 |-- CompanyId: string (nullable = true)
 |-- Country: string (nullable = true)
|-- vendorTags: array (nullable = true)
 |    |-- element: struct (containsNull = true)
 |    |    |-- score: double (nullable = true)
 |    |    |-- vendor: string (nullable = true)

J'ai essayé la requête ci-dessous pour sélectionner des champs imbriqués de vendorTags

df3 = sqlContext.sql("select vendorTags.vendor from globalcontacts")

Comment puis-je interroger les champs imbriqués dans where clause comme ci-dessous dans PySpark

df3 = sqlContext.sql("select vendorTags.vendor from globalcontacts where vendorTags.vendor = 'alpha'")

ou

df3 = sqlContext.sql("select vendorTags.vendor from globalcontacts where vendorTags.score > 123.123456")

quelque chose comme ça..

J'ai essayé ci-dessus les requêtes pour obtenir l'erreur ci-dessous

df3 = sqlContext.sql("select vendorTags.vendor from globalcontacts where vendorTags.vendor = 'alpha'")
16/03/15 13:16:02 INFO ParseDriver: Parsing command: select vendorTags.vendor from globalcontacts where vendorTags.vendor = 'alpha'
16/03/15 13:16:03 INFO ParseDriver: Parse Completed
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/spark/python/pyspark/sql/context.py", line 583, in sql
    return DataFrame(self._ssql_ctx.sql(sqlQuery), self)
  File "/usr/lib/spark/python/lib/py4j-0.9-src.zip/py4j/java_gateway.py", line 813, in __call__
  File "/usr/lib/spark/python/pyspark/sql/utils.py", line 51, in deco
    raise AnalysisException(s.split(': ', 1)[1], stackTrace)
pyspark.sql.utils.AnalysisException: u"cannot resolve '(vendorTags.vendor = cast(alpha as double))' due to data type mismatch: differing types in '(vendorTags.vendor = cast(alpha as double))' (array<string> and double).; line 1 pos 71"

OriginalL'auteur Suhas Chandramouli | 2016-03-15