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From "Anton Kedin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BEAM-3574) [SQL] Support schema qualifiers for field names
Date Wed, 31 Jan 2018 06:50:00 GMT
Anton Kedin created BEAM-3574:
---------------------------------

             Summary: [SQL] Support schema qualifiers for field names
                 Key: BEAM-3574
                 URL: https://issues.apache.org/jira/browse/BEAM-3574
             Project: Beam
          Issue Type: Bug
          Components: dsl-sql
            Reporter: Anton Kedin


Currently there are utility methods in BeamRecord to get field values by name, e.g. BeamRecord.getFieldValue(String
name). Internally they call fieldNamesArrayList.indexOf(fieldName) to find the index of the
field name.

This works as long as there is only one field with such name in the record. But when joining
2 records you can end up with duplicate fields without any means of distinguishing them
and getting a value from specific field by name. We don't keep any metadata in BeamRecordType
to help identify a field in this case. 

It feels that this can lead to obscure bugs.

We probably should keep more detailed schema information attached to the fields, so that we
could reference them using qualifiers like "[schemaA].[pcollectionB].[fieldC]".

 



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