[jira] [Created] (SPARK-23380) Make toPandas fall back to Arrow optimization disabled when schema is mismatched

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

Hyukjin Kwon created SPARK-23380:
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             Summary: Make toPandas fall back to Arrow optimization disabled when schema is mismatched
                 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


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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