Commits on Mar 18, 2020

1. Broker: Add ability to inline subqueries. …

   The main changes:
   
   - ClientQuerySegmentWalker: Add ability to inline queries.
   - Query: Add "getSubQueryId" and "withSubQueryId" methods.
   - QueryMetrics: Add "subQueryId" dimension.
   - ServerConfig: Add new "maxSubqueryRows" parameter, which is used by
     ClientQuerySegmentWalker to limit how many rows can be inlined per
     query.
   - IndexedTableJoinMatcher: Allow creating keys on top of unknown types,
     by assuming they are strings. This is useful because not all types are
     known for fields in query results.
   - InlineDataSource: Store RowSignature rather than component parts. Add
     more zealous "equals" and "hashCode" methods to ease testing.
   - Moved QuerySegmentWalker test code from CalciteTests and
     SpecificSegmentsQueryWalker in druid-sql to QueryStackTests in
     druid-server. Use this to spin up a new ClientQuerySegmentWalkerTest.

   

   gianm committed Mar 18, 2020
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2. Adjustments from CI.

   

   gianm committed Mar 18, 2020
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3. Fix integration test.

   

   gianm committed Mar 18, 2020
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