[jira] [Commented] (CASSANDRA-6309) Pig CqlStorage generates ERROR 1108: Duplicate schema alias

["Alex Liu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-6309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13840621#comment-13840621 ] 

Alex Liu commented on CASSANDRA-6309:
-------------------------------------

6309-fix-pig-test-compiling.txt fixes the build issue for pig test



> Pig CqlStorage generates  ERROR 1108: Duplicate schema alias
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-6309
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6309
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>            Reporter: Thunder Stumpges
>            Assignee: Alex Liu
>         Attachments: 6309-2.0.txt, 6309-fix-pig-test-compiling.txt, 6309-v2-2.0-branch.txt, 6309-v3.txt, LOCAL_ONE-write-for-all-strategies-v2.txt, LOCAL_ONE-write-for-all-strategies.txt
>
>
> In Pig after loading a simple CQL3 table from Cassandra 2.0.1, and dumping contents, I receive:
> Caused by: org.apache.pig.impl.plan.PlanValidationException: ERROR 1108: Duplicate schema alias: author in "cm"
>  cm = load 'cql://thunder_test/cassandra_messages' USING CqlStorage;
>  dump cm
> ERROR org.apache.pig.tools.grunt.Grunt - org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias cm
> ...
> Caused by: org.apache.pig.impl.plan.PlanValidationException: ERROR 1108: Duplicate schema alias: author in "cm"
>         at org.apache.pig.newplan.logical.visitor.SchemaAliasVisitor.validate(SchemaAliasVisitor.java:75)
> running 'describe cm' gives:
> cm: {message_id: chararray,author: chararray,author: chararray,body: chararray,message_id: chararray}
> The original table schema in Cassandra is:
> CREATE TABLE cassandra_messages (
>   message_id text,
>   author text,
>   body text,
>   PRIMARY KEY (message_id, author)
> ) WITH
>   bloom_filter_fp_chance=0.010000 AND
>   caching='KEYS_ONLY' AND
>   comment='null' AND
>   dclocal_read_repair_chance=0.000000 AND
>   gc_grace_seconds=864000 AND
>   index_interval=128 AND
>   read_repair_chance=0.100000 AND
>   replicate_on_write='true' AND
>   populate_io_cache_on_flush='false' AND
>   default_time_to_live=0 AND
>   speculative_retry='NONE' AND
>   memtable_flush_period_in_ms=0 AND
>   compaction={'class': 'SizeTieredCompactionStrategy'} AND
>   compression={'sstable_compression': 'LZ4Compressor'};
> it appears that the code in CqlStorage.getColumnMetadata at ~line 478 takes the "keys" columns (in my case, message_id and author) and appends the columns from getColumnMeta (which has all three columns). Thus the keys columns are duplicated.



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