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Implements grouping() and grouping_id() builtins. grouping_id() has both a no-arg version, which returns a bit vector of all grouping exprs and a varargs version, which returns a bit vector of the provided arguments. Grouping is a keyword, so needs special handling in the parser to be accepted as a function name. These functions are implemented in the transpose agg with a CASE expression similar to other aggregate functions, but returning the grouping() or grouping_id() value for that aggregation class instead of an aggregated value. Testing: * Added parser test for grouping keyword. * Added analysis tests for the functions. * Added basic planner test to show expressions generated * Added some TPC-DS queries that use grouping() - queries 80, 70 and 86 using reference .test files from Fang-Yu Rao. 27 and 36 were added with reference results from https://github.com/cwida/tpcds-result-reproduction * Add targeted end-to-end tests. * Added view compatibility test with Hive. Change-Id: If0b1640d606256c0fe9204d2a21a8f6d06abcdb6 Reviewed-on: http://gerrit.cloudera.org:8080/16140 Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com> Tested-by: Tim Armstrong <tarmstrong@cloudera.com>