Fix DRILL-791: In Phase 1of2 use the agg expr ordinal and create new AggregateCall for non-COUNT functions.
DRILL-784: Implement min, max, count for VarChar and VarBinary data type. Re-enable aggregate function tests.
Fix ExprLexer to correctly deserialize decimal data type.
DRILL-763: Handle SubSchemaWrapper correctly in ShowFileHandler.
DRILL-680: INFORMATION_SCHEMA.COLUMNS does not display HBase column families

+ Enhanced result layout with option to set output width on per column basis.
+ Pretty print plan fragments.