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https://issues.apache.org/jira/browse/DRILL-7373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16929215#comment-16929215
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ASF GitHub Bot commented on DRILL-7373:
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KazydubB commented on pull request #1854: DRILL-7373: Fix problems involving
reading from DICT type
URL: https://github.com/apache/drill/pull/1854
- Fixed `FieldIdUtil` to resolve reading from `DICT` for some complex cases;
- optimized reading from `DICT` given a key by passing an appropriate
`Object` type to `DictReader#find(...)` and `DictReader#read(...)` methods when
schema is known (e.g. when reading from Hive tables) instead of generating it
on fly based on int or String path and key type;
- fixed error when accessing value by not existing key value in Avro table.
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> 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
> Priority: Major
>
> 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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