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https://issues.apache.org/jira/browse/SPARK-11412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14987127#comment-14987127
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Michael Armbrust commented on SPARK-11412:
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This is only currently supported for parquet.
> Support merge schema for ORC
> ----------------------------
>
> Key: SPARK-11412
> URL: https://issues.apache.org/jira/browse/SPARK-11412
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Dave
>
> when I tried to load partitioned orc files with a slight difference in a
> nested column. say
> column
> -- request: struct (nullable = true)
> | |-- datetime: string (nullable = true)
> | |-- host: string (nullable = true)
> | |-- ip: string (nullable = true)
> | |-- referer: string (nullable = true)
> | |-- request_uri: string (nullable = true)
> | |-- uri: string (nullable = true)
> | |-- useragent: string (nullable = true)
> And then there's a page_url_lists attributes in the later partitions.
> I tried to use
> val s = sqlContext.read.format("orc").option("mergeSchema",
> "true").load("/data/warehouse/xxxx") to load the data.
> But the schema doesn't show request.page_url_lists.
> I am wondering if schema merge doesn't work for orc?
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