paul-rogers opened a new pull request #1868: DRILL-7377: Nested schemas for dynamic EVF columns URL: https://github.com/apache/drill/pull/1868 The Result Set Loader (part of EVF) allows adding columns up-front before reading rows (so-called "early schema.") Such schemas allow nested columns (maps with members, repeated lists with a type, etc.) The Result Set Loader also allows adding columns dynamically while loading data (so-called "late schema".) Previously, the code assumed that columns would be added top-down: first the map, then the map's contents, etc. Charles found a need to allow adding a nested column (a repeated list with a declared list type.) This patch revises the code to use the same mechanism in both the early- and late-schema cases, allowing adding nested columns at any time. Testing: Added a new unit test case for the repeated list late schema with content case.
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