[GitHub] [drill] paul-rogers opened a new pull request #1868: DRILL-7377: Nested schemas for dynamic EVF columns

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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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