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From "Bohdan Kazydub (Jira)" <j...@apache.org>
Subject [jira] [Created] (DRILL-7373) Fix problems involving reading from DICT type
Date Wed, 11 Sep 2019 16:14:00 GMT
Bohdan Kazydub created DRILL-7373:
-------------------------------------

             Summary: Fix problems involving reading from DICT type
                 Key: DRILL-7373
                 URL: https://issues.apache.org/jira/browse/DRILL-7373
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Bohdan Kazydub
            Assignee: Bohdan Kazydub


Add better support for different key types ({{boolean}}, {{decimal}}, {{float}}, {{double}}
etc.) when retrieving values by key from {{DICT}} column  when querying data source with known
(during query validation phase) field types (such as Hive table), so that actual key object
instance  is created in generated code and is passed to given {{DICT}} reader instead of generating
its value for every row based on {{int}} ({{ArraySegment}}) or {{String}} ({{NamedSegment}})
value.

This may be achieved by storing original literal value of passed key (as {{Object}}) in {{PathSegment}}
and its type (as {{MajorType}}) and using it during code generation when reading {{DICT}}'s
values by key in {{EvaluationVisitor}}.

Also, fix NPE when reading some cases involving reading values from {{DICT}} and fix wrong
result when reading complex structures using many ITEM operators (i.e. , [] brackets), e.g.

{code}
SELECT rid, mc.map_arr_map['key01'][1]['key01.1'] p16 FROM hive.map_complex_tbl mc
{code}
where {{map_arr_map}} is of following type: {{MAP<STRING, ARRAY<MAP<STRING, INT>>>}}




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