Bohdan Kazydub created DRILL-7373:
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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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