avg_float_null

- array_xxx -> coll_xxx, which considers nulls and missings,

- array_sql_xxx -> array_xxx, which ignores nulls and missings.

Change-Id: Ie58c31af69094b93ba21df54f90f5fad28998a34

Reviewed-on: https://asterix-gerrit.ics.uci.edu/1236

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

- tinyint for int8;

- smallint for int16;

- integer(or, int) for int32;

- bigint for int64;

- year_month_duration for year-month-duration;

- day_time_duration for day-time-duration;

- timestamp for datetime;

- double precision for double;

int8, int16, int32, int64, year-month-duration and day-time-duration

is going to be deprecated.

In addition, it

- converts underscores to hypens for SQL++ functions;

- uses "array_" prefix for builtin aggregation functions.

Change-Id: I5c4a933f9775e89c2d503d9ea1cb98c5934d1475

Reviewed-on: https://asterix-gerrit.ics.uci.edu/1199

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Reviewed-by: Yingyi Bu <buyingyi@gmail.com>

Change-Id: Ia80193f08651fc99341d9a8cf156d0feb6d0575f

Reviewed-on: https://asterix-gerrit.ics.uci.edu/1036

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

Change-Id: I2db58d68e8e28befa4105504c261b101fa0285af

Reviewed-on: https://asterix-gerrit.ics.uci.edu/909

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