Re: Re: fink sql client not able to read parquet format table

Posted by Jingsong Li on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/fink-sql-client-not-able-to-read-parquet-format-table-tp34119p34197.html

Hi lei,

Which hive version did you use?

Can you share the complete hive DDL?

Best,

Jingsong Lee

On Thu, Apr 9, 2020 at 7:15 PM [hidden email] <[hidden email]> wrote:

I am using the newest 1.10 blink planner.

Perhaps it is because of the method i used to write the parquet file.

Receive kafka message, transform each message to a Java class Object, write the Object to HDFS using StreamingFileSink, add  the HDFS path as a partition of the hive table

No matter what the order of the field description in  hive ddl statement, the hive client will work, as long as  the field name is the same with Java Object field name.

But flink sql client will not work.

DataStream<RobotUploadData0101> sourceRobot = source.map( x->transform(x));
final StreamingFileSink<RobotUploadData0101> sink;
sink = StreamingFileSink
    .forBulkFormat(new Path("hdfs://172.19.78.38:8020/user/root/wanglei/robotdata/parquet"),
        ParquetAvroWriters.forReflectRecord(RobotUploadData0101.class))

For example 

RobotUploadData0101 has two fields:  robotId int, robotTime long

CREATE TABLE `robotparquet`(  `robotid` int,  `robottime` bigint ) and 

CREATE TABLE `robotparquet`(  `robottime` bigint,   `robotid` int)

is the same for hive client, but is different for flink-sql client

It is an expected behavior?

Thanks,

Lei

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[hidden email] 

 

From: [hidden email]

Date: 2020-04-09 14:48

To: [hidden email]; [hidden email]; [hidden email]

CC: [hidden email]

Subject: Re: fink sql client not able to read parquet format table

Hi Lei,

Are you using the newest 1.10 blink planner? 

I'm not familiar with Hive and parquet, but I know [hidden email] and [hidden email] are experts on this. Maybe they can help on this question. 

Best,

Jark

On Tue, 7 Apr 2020 at 16:17, [hidden email] <[hidden email]> wrote:

Hive table stored as parquet.

Under hive client: 

hive> select robotid from robotparquet limit 2;

OK

1291097

1291044

But under flink sql-client the result is 0

Flink SQL> select robotid  from robotparquet limit 2;

                  robotid

                         0

                         0

Any insight on this?

Thanks，

Lei

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[hidden email] 

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