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https://issues.apache.org/jira/browse/PARQUET-402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15051521#comment-15051521
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Ryan Blue commented on PARQUET-402:
-----------------------------------
Is there anything we can do about it? Maybe we should at least throw an
exception when the map type passed to Parquet can't be converted to a valid
Parquet schema because the KV types are missing.
> Apache Pig cannot store Map data type into Parquet format
> ---------------------------------------------------------
>
> Key: PARQUET-402
> URL: https://issues.apache.org/jira/browse/PARQUET-402
> Project: Parquet
> Issue Type: Bug
> Components: parquet-pig
> Affects Versions: 1.6.0, 1.8.1
> Reporter: Jerry Ylilammi
>
> Trying to store simple map with two entries gives me following exception:
> {code}table_with_map_data: {my_map: map[]}
> 2015-12-10 11:58:54,478 [main] INFO
> org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is
> deprecated. Instead, use fs.defaultFS
> 2015-12-10 11:58:54,498 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
> 2999: Unexpected internal error. Invalid map Schema, schema should contain
> exactly one field: my_map: map{code}
> For example taking any input and doing this gives me the exception:
> {code}table_with_map_data = FOREACH random_data GENERATE TOMAP('123',
> 'hello', '456', 'world') as (my_map);
> DESCRIBE table_with_map_data;
> STORE table_with_map_data INTO '...' USING ParquetStorer();{code}
> I'm using latest version of Pig: Apache Pig version 0.15.0 (r1682971)
> compiled Jun 01 2015, 11:44:35
> and Parquet: parquet-pig-bundle-1.6.0.jar
> EDIT: I noticed Parquet 1.8.1 is out. I switched to it and were forced to
> update the pig script to use full path with ParquetStorer. However this gives
> me same error as 1.6.0.
> {code}STORE table_with_map_data INTO
> '/Users/jerry/tmp/parquet/output/parquet' USING
> org.apache.parquet.pig.ParquetStorer();{code}
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