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ASTERIXDB-1228: Add MISSING into the data model.

1. MISSING repsents the value of a non-existing field in a record

or an out-of-bound index access of a collection;

2. NULL represents that the value of an optional field in a record

is unknown or the value of existing collection entry is unknown.

3. Unit tests for all missing/null-in-missing/null-out scalar functions.

Change-Id: Ia49ed8474bfc5d6604231819065117468c5b0897

Reviewed-on: https://asterix-gerrit.ics.uci.edu/846

Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>

Reviewed-by: Till Westmann <tillw@apache.org>

  1. … 551 more files in changeset.
Deadlock-free locking protocol is enabled

- Added EntityCommitProfiler class in TransactionSubsystem.java file:

This profiler takes a report interval (in seconds) parameter and

reports entity level commit count every report interval (in seconds)

only if IS_PROFILE_MODE is set to true. The profiler runs in a separate

thread. However, the profiler thread doesn't start reporting the count

until the entityCommitCount > 0. The profiler can be used to measure

1) IPS (Inserts Per Second) and

2) IIPS (instantaneous IPS) for the every report interval.

Change-Id: Ie58ae2f519baa53599e99b51bd61ea5f8366dafd

Reviewed-on: https://asterix-gerrit.ics.uci.edu/825

Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>

Reviewed-by: Murtadha Hubail <hubailmor@gmail.com>

  1. … 63 more files in changeset.