[jira] [Created] (DRILL-5829) RecordBatchLoader schema comparison is not case insensitive

["Paul Rogers (JIRA)" <ji...@apache.org>]

Paul Rogers created DRILL-5829:
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             Summary: RecordBatchLoader schema comparison is not case insensitive
                 Key: DRILL-5829
                 URL: https://issues.apache.org/jira/browse/DRILL-5829
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.11.0
            Reporter: Paul Rogers
            Assignee: Paul Rogers
             Fix For: 1.12.0


The class {{RecordBatchLoader}} decodes batches received over the wire. It determines if the schema of the new batch matches that of the old one. To do that, it uses a map of existing columns.

In Drill, column names follow SQL rules: they are case insensitive. Yet, the implementation of {{RecordBatchLoader}} uses a case sensitive map:

{code}
    final Map<String, ValueVector> oldFields = Maps.newHashMap();
{code}

This should be:

{code}
    final Map<String, ValueVector> oldFields = CaseInsensitiveMap.newHashMap();
{code}

Without this change, the receivers will report schema changes if a column differs only in name case. However, Drill semantics say that names that differ in case are identical, and so no schema change should be issued.



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