Paul Rogers created DRILL-6791:
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Summary: Merge scan projection framework into master
Key: DRILL-6791
URL: https://issues.apache.org/jira/browse/DRILL-6791
Project: Apache Drill
Issue Type: Improvement
Affects Versions: 1.15.0
Reporter: Paul Rogers
Assignee: Paul Rogers
Merge the next set of "result set loader" code into master via a PR. This one
covers the "schema projection" mechanism which:
* Handles none (SELECT COUNT(*)), some (SELECT a, b, x) and all (SELECT *)
projection.
* Handles null columns (for projection a column "x" that does not exist in the
base table.)
* Handle file metadata (AKA implicit columns)
* Handle schema persistence: the need to reuse the same vectors across
different scanners
* Provides a framework for consuming externally-supplied metadata
* Baring "real" metadata, obtains metadata hints from previous batches and from
the projection list (a.b implies that "a" is a map, c[0] implies that "c" is an
array, etc.)
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