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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2018/02/10 09:38:00 UTC
[jira] [Updated] (SPARK-23380) Make toPandas fall back to Arrow
optimization disabled when schema is not supported in the Arrow
optimization
[ https://issues.apache.org/jira/browse/SPARK-23380?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon updated SPARK-23380:
---------------------------------
Summary: Make toPandas fall back to Arrow optimization disabled when schema is not supported in the Arrow optimization (was: Make toPandas fall back to Arrow optimization disabled when schema is mismatched)
> Make toPandas fall back to Arrow optimization disabled when schema is not supported in the Arrow optimization
> --------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-23380
> URL: https://issues.apache.org/jira/browse/SPARK-23380
> Project: Spark
> Issue Type: Sub-task
> Components: PySpark
> Affects Versions: 2.3.0
> Reporter: Hyukjin Kwon
> Priority: Major
>
> Seems we can check the schema ahead and fall back in toPandas.
> Please see this case below:
> {code}
> df = spark.createDataFrame([[{'a': 1}]])
> spark.conf.set("spark.sql.execution.arrow.enabled", "false")
> df.toPandas()
> spark.conf.set("spark.sql.execution.arrow.enabled", "true")
> df.toPandas()
> {code}
> {code}
> ...
> py4j.protocol.Py4JJavaError: An error occurred while calling o42.collectAsArrowToPython.
> ...
> java.lang.UnsupportedOperationException: Unsupported data type: map<string,bigint>
> {code}
> In case of {{createDataFrame}}, we fall back to make this at least working even though the optimisation is disabled.
> {code}
> df = spark.createDataFrame([[{'a': 1}]])
> spark.conf.set("spark.sql.execution.arrow.enabled", "false")
> pdf = df.toPandas()
> spark.createDataFrame(pdf).show()
> spark.conf.set("spark.sql.execution.arrow.enabled", "true")
> spark.createDataFrame(pdf).show()
> {code}
> {code}
> ...
> ... UserWarning: Arrow will not be used in createDataFrame: Error inferring Arrow type ...
> +--------+
> | _1|
> +--------+
> |[a -> 1]|
> +--------+
> {code}
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