DRILL-1741: kvgen support for complex values (maps/ lists)
DRILL-1141:ISNUMERIC function
DRILL-985: Referencing a view via its filename
DRILL-1185: Drill not picking up 'text' files from classpath
DRILL-1376 ORDER BY clause ignored in query run through web UI - Bug fixed
DRILL-1404: Queries with empty results are throwing "HTTP ERROR 500" from Web UI
DRILL-1707: Don't push Filter past Project if the Filter is referencing ITEM expression produced by the Project (this is done as part of a new rule). Enable a few tests in TestProjectPushDown and TestExampleQueries that were marked Ignored earlier.
DRILL-1738: Allow case insensitive read in Complex parquet reader
DRILL-1739 Handle missing fields in complex parquet reader
DRILL-1660: return accurate buffers size when repeated map vector has no underlying vectors
DRILL-1743: check capacity before writing into map vector
DRILL-1729: derive & infer result type for boolean returning custom functions so that optiq can validate and execute user queries seamlessly
DRILL-1185: Unit test for delimited text failing in classpath storage plugin.
DRILL-1458: New unit test framework.

Review comments, cleanup, additional tests

Matching columns, throw useful error messages if there are missing or extra columns.

Few more features in unit test framework, providing several baseline records in the builder pattern, allow checking empty result. Added a new unit test to ensure that nulls were validated properly in both the ordered and unordered cases.
DRILL-1737: Fix decimal handling in unit test framework.
DRILL-1775: Fix BINARY ENUM in Parquet converter.
DRILL-1749: Support nested maps in the flatten operator.
DRILL-1753: Flatten 2 level repeated map
DRILL-1787: Fix memory leak in kvgen function.
Fix for flatten receiving a non-repeated type during fast schema step.