[jira] [Created] (FLINK-19740) Error in to_pandas for table containing event time: class java.time.LocalDateTime cannot be cast to class java.sql.Timestamp

[Shang Yuanchun (Jira)]

Alex Hall created FLINK-19740:
---------------------------------

             Summary: Error in to_pandas for table containing event time: class java.time.LocalDateTime cannot be cast to class java.sql.Timestamp
                 Key: FLINK-19740
                 URL: https://issues.apache.org/jira/browse/FLINK-19740
             Project: Flink
          Issue Type: Bug
          Components: API / Python, Table SQL / API
    Affects Versions: 1.11.2, 1.12.0
         Environment: Ubuntu 18.04

Python 3.8, jar built from master yesterday.

Or Python 3.7, installed latest version from pip.
            Reporter: Alex Hall


In a nutshell, if I create a table with an event time column:

{{CREATE TABLE simple_table (}}
 {{   ts TIMESTAMP(3),}}
 {{   WATERMARK FOR ts AS ts - INTERVAL '5' SECOND}}
 {{)}}

then it fails to serialize with .to_pandas(). This only happens with the watermark line and in streaming mode.

Full code:

{{from pyflink.table import EnvironmentSettings, StreamTableEnvironment}}{{env_settings = (}}
{{ EnvironmentSettings.new_instance().in_streaming_mode().use_blink_planner().build()}}
{{ )}}
{{ table_env = StreamTableEnvironment.create(environment_settings=env_settings)}}
{{ table_env.execute_sql(}}
{{ """}}
{{ CREATE TABLE simple_table (}}
{{ ts TIMESTAMP(3),}}
{{ WATERMARK FOR ts AS ts - INTERVAL '5' SECOND}}
{{ ) WITH (}}
{{ 'connector.type' = 'filesystem',}}
{{ 'format.type' = 'csv',}}
{{ 'connector.path' = '/home/alex/.config/JetBrains/PyCharm2020.2/scratches/scratch_2.csv'}}
{{ )}}
{{ """}}
{{ )}}{{print(table_env.from_path("simple_table").to_pandas())}}

Output:
  
 WARNING: An illegal reflective access operation has occurred
 WARNING: Illegal reflective access by org.apache.flink.api.python.shaded.io.netty.util.internal.ReflectionUtil ([file:/home/alex/work/flink/flink-dist/target/flink-1.12-SNAPSHOT-bin/flink-1.12-SNAPSHOT/opt/flink-python_2.11-1.12-SNAPSHOT.jar|file:///home/alex/work/flink/flink-dist/target/flink-1.12-SNAPSHOT-bin/flink-1.12-SNAPSHOT/opt/flink-python_2.11-1.12-SNAPSHOT.jar]) to constructor java.nio.DirectByteBuffer(long,int)
 WARNING: Please consider reporting this to the maintainers of org.apache.flink.api.python.shaded.io.netty.util.internal.ReflectionUtil
 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
 WARNING: All illegal access operations will be denied in a future release
 Traceback (most recent call last):
 File "/home/alex/.config/JetBrains/PyCharm2020.2/scratches/scratch_903.py", line 20, in <module>
 print(table_env.from_path("simple_table").to_pandas())
 File "/home/alex/work/flink/flink-python/pyflink/table/table.py", line 839, in to_pandas
 table = pa.Table.from_batches(serializer.load_from_iterator(batches))
 File "pyarrow/table.pxi", line 1576, in pyarrow.lib.Table.from_batches
 File "/home/alex/work/flink/flink-python/pyflink/table/serializers.py", line 76, in load_from_iterator
 reader = pa.ipc.open_stream(
 File "/home/alex/.cache/pypoetry/virtualenvs/relycomply-WA1zLZ2n-py3.8/lib/python3.8/site-packages/pyarrow/ipc.py", line 146, in open_stream
 return RecordBatchStreamReader(source)
 File "/home/alex/.cache/pypoetry/virtualenvs/relycomply-WA1zLZ2n-py3.8/lib/python3.8/site-packages/pyarrow/ipc.py", line 62, in __init__
 self._open(source)
 File "pyarrow/ipc.pxi", line 360, in pyarrow.lib._RecordBatchStreamReader._open
 File "pyarrow/error.pxi", line 123, in pyarrow.lib.pyarrow_internal_check_status
 File "/home/alex/work/flink/flink-python/pyflink/table/serializers.py", line 69, in readinto
 input = self.leftover or (self.itor.next() if self.itor.hasNext() else None)
 File "/home/alex/.cache/pypoetry/virtualenvs/relycomply-WA1zLZ2n-py3.8/lib/python3.8/site-packages/py4j/java_gateway.py", line 1285, in __call__
 return_value = get_return_value(
 File "/home/alex/work/flink/flink-python/pyflink/util/exceptions.py", line 147, in deco
 return f(*a, **kw)
 File "/home/alex/.cache/pypoetry/virtualenvs/relycomply-WA1zLZ2n-py3.8/lib/python3.8/site-packages/py4j/protocol.py", line 326, in get_return_value
 raise Py4JJavaError(
 py4j.protocol.Py4JJavaError: An error occurred while calling o39.next.
 : java.lang.RuntimeException: Failed to serialize the data of the table
 at org.apache.flink.table.runtime.arrow.ArrowUtils$2.next(ArrowUtils.java:683)
 at org.apache.flink.table.runtime.arrow.ArrowUtils$2.next(ArrowUtils.java:663)
 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.base/java.lang.reflect.Method.invoke(Method.java:566)
 at org.apache.flink.api.python.shaded.py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
 at org.apache.flink.api.python.shaded.py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
 at org.apache.flink.api.python.shaded.py4j.Gateway.invoke(Gateway.java:282)
 at org.apache.flink.api.python.shaded.py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
 at org.apache.flink.api.python.shaded.py4j.commands.CallCommand.execute(CallCommand.java:79)
 at org.apache.flink.api.python.shaded.py4j.GatewayConnection.run(GatewayConnection.java:238)
 at java.base/java.lang.Thread.run(Thread.java:834)
 Caused by: java.lang.ClassCastException: class java.time.LocalDateTime cannot be cast to class java.sql.Timestamp (java.time.LocalDateTime is in module java.base of loader 'bootstrap'; java.sql.Timestamp is in module java.sql of loader 'platform')
 at org.apache.flink.table.data.util.DataFormatConverters$TimestampConverter.toInternalImpl(DataFormatConverters.java:897)
 at org.apache.flink.table.data.util.DataFormatConverters$DataFormatConverter.toInternal(DataFormatConverters.java:381)
 at org.apache.flink.table.data.util.DataFormatConverters$RowConverter.toInternalImpl(DataFormatConverters.java:1426)
 at org.apache.flink.table.data.util.DataFormatConverters$RowConverter.toInternalImpl(DataFormatConverters.java:1414)
 at org.apache.flink.table.data.util.DataFormatConverters$DataFormatConverter.toInternal(DataFormatConverters.java:381)
 at org.apache.flink.table.runtime.arrow.ArrowUtils$1.next(ArrowUtils.java:655)
 at org.apache.flink.table.runtime.arrow.ArrowUtils$1.next(ArrowUtils.java:641)
 at org.apache.flink.table.runtime.arrow.ArrowUtils$2.next(ArrowUtils.java:675)
 ... 12 more



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