Arina Ielchiieva created DRILL-7092:
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Summary: Rename map to struct in schema definition
Key: DRILL-7092
URL: https://issues.apache.org/jira/browse/DRILL-7092
Project: Apache Drill
Issue Type: Sub-task
Reporter: Arina Ielchiieva
Assignee: Arina Ielchiieva
Fix For: 1.16.0
Drill maps concept is more close to Struct concept. Good write up by Paul about
this:
https://github.com/paul-rogers/drill/wiki/Drill-Maps. Internally such objects
are represented by MapVector which in future will be renamed to StructVector
(similar was done in Arrow project). Drill also does not support true maps,
which in future will be also implemented with proper naming (MapVector).
Nevertheless, internal map / struct presentation does not affect users plus
before schema provisioning they did not deal with this concept at all.
Initially map complex type in Schema Provisioning schema was represented with
map keyword followed by angle brackets: col1 map<m1 int, m2 int>. Given second
though to map notion, looks like it's better to use struct in schema definition
and internally convert it to map metadata (again which eventually will be
renamed to struct). Such approach would ease map to struct renaming (since it
will be done internally) and users will be using struct naming as before. Once
Drill will implement true map, schema provisioning will allow map type for
schema.
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