[jira] [Assigned] (SPARK-11437) createDataFrame shouldn't .take() when provided schema
[ https://issues.apache.org/jira/browse/SPARK-11437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Apache Spark reassigned SPARK-11437: Assignee: Apache Spark > createDataFrame shouldn't .take() when provided schema > -- > > Key: SPARK-11437 > URL: https://issues.apache.org/jira/browse/SPARK-11437 > Project: Spark > Issue Type: Improvement > Components: PySpark >Reporter: Jason White >Assignee: Apache Spark > > When creating a DataFrame from an RDD in PySpark, `createDataFrame` calls > `.take(10)` to verify the first 10 rows of the RDD match the provided schema. > Similar to https://issues.apache.org/jira/browse/SPARK-8070, but that issue > affected cases where a schema was not provided. > Verifying the first 10 rows is of limited utility and causes the DAG to be > executed non-lazily. If necessary, I believe this verification should be done > lazily on all rows. However, since the caller is providing a schema to > follow, I think it's acceptable to simply fail if the schema is incorrect. > https://github.com/apache/spark/blob/master/python/pyspark/sql/context.py#L321-L325 -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org
[jira] [Assigned] (SPARK-11437) createDataFrame shouldn't .take() when provided schema
[ https://issues.apache.org/jira/browse/SPARK-11437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Apache Spark reassigned SPARK-11437: Assignee: (was: Apache Spark) > createDataFrame shouldn't .take() when provided schema > -- > > Key: SPARK-11437 > URL: https://issues.apache.org/jira/browse/SPARK-11437 > Project: Spark > Issue Type: Improvement > Components: PySpark >Reporter: Jason White > > When creating a DataFrame from an RDD in PySpark, `createDataFrame` calls > `.take(10)` to verify the first 10 rows of the RDD match the provided schema. > Similar to https://issues.apache.org/jira/browse/SPARK-8070, but that issue > affected cases where a schema was not provided. > Verifying the first 10 rows is of limited utility and causes the DAG to be > executed non-lazily. If necessary, I believe this verification should be done > lazily on all rows. However, since the caller is providing a schema to > follow, I think it's acceptable to simply fail if the schema is incorrect. > https://github.com/apache/spark/blob/master/python/pyspark/sql/context.py#L321-L325 -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org
