text: --
  -- INTERVAL
  --
  
  SET DATESTYLE = 'ISO';
  SET IntervalStyle to postgres;
  
  -- check acceptance of "time zone style"
  SELECT INTERVAL '01:00' AS "One hour";
  SELECT INTERVAL '+02:00' AS "Two hours";
  SELECT INTERVAL '-08:00' AS "Eight hours";
  SELECT INTERVAL '-1 +02:03' AS "22 hours ago...";
  SELECT INTERVAL '-1 days +02:03' AS "22 hours ago...";
  SELECT INTERVAL '1.5 weeks' AS "Ten days twelve hours";
  SELECT INTERVAL '1.5 months' AS "One month 15 days";
  SELECT INTERVAL '10 years -11 month -12 days +13:14' AS "9 years...";
  
  CREATE TABLE INTERVAL_TBL (f1 interval PRIMARY KEY);
  
  -- Disallow interval in a primary key until we support it properly.
  -- See https://github.com/YugaByte/yugabyte-db/issues/1397.
  --
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 1 minute');
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 5 hour');
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 10 day');
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 34 year');
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 3 months');
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 14 seconds ago');
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('1 day 2 hours 3 minutes 4 seconds');
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('6 years');
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('5 months');
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('5 months 12 hours');
  
  -- badly formatted interval
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('badly formatted interval');
  -- INSERT INTO INTERVAL_TBL (f1) VALUES ('@ 30 eons ago');
  
  -- test interval operators
  
  -- SELECT '' AS ten, * FROM INTERVAL_TBL ORDER BY f1;
  
  -- SELECT '' AS nine, * FROM INTERVAL_TBL
  --    WHERE INTERVAL_TBL.f1 <> interval '@ 10 days' ORDER BY f1;
  
  -- SELECT '' AS three, * FROM INTERVAL_TBL
  --    WHERE INTERVAL_TBL.f1 <= interval '@ 5 hours' ORDER BY f1;
  
  -- SELECT '' AS three, * FROM INTERVAL_TBL
  --    WHERE INTERVAL_TBL.f1 < interval '@ 1 day' ORDER BY f1;
  
  -- SELECT '' AS one, * FROM INTERVAL_TBL
  --    WHERE INTERVAL_TBL.f1 = interval '@ 34 years' ORDER BY f1;
  
  -- SELECT '' AS five, * FROM INTERVAL_TBL
  --    WHERE INTERVAL_TBL.f1 >= interval '@ 1 month' ORDER BY f1;
  
  -- SELECT '' AS nine, * FROM INTERVAL_TBL
  --    WHERE INTERVAL_TBL.f1 > interval '@ 3 seconds ago' ORDER BY f1;
  
  -- SELECT '' AS fortyfive, r1.*, r2.*
  --    FROM INTERVAL_TBL r1, INTERVAL_TBL r2
  --    WHERE r1.f1 > r2.f1
  --    ORDER BY r1.f1, r2.f1;
  
  -- Test intervals that are large enough to overflow 64 bits in comparisons
  CREATE TABLE INTERVAL_TBL_OF (f1 interval);
  INSERT INTO INTERVAL_TBL_OF (f1) VALUES
    ('2147483647 days 2147483647 months'),
    ('2147483647 days -2147483648 months'),
    ('1 year'),
    ('-2147483648 days 2147483647 months'),
    ('-2147483648 days -2147483648 months');
  -- these should fail as out-of-range
  INSERT INTO INTERVAL_TBL_OF (f1) VALUES ('2147483648 days');
  INSERT INTO INTERVAL_TBL_OF (f1) VALUES ('-2147483649 days');
  INSERT INTO INTERVAL_TBL_OF (f1) VALUES ('2147483647 years');
  INSERT INTO INTERVAL_TBL_OF (f1) VALUES ('-2147483648 years');
  
  SELECT r1.*, r2.*
     FROM INTERVAL_TBL_OF r1, INTERVAL_TBL_OF r2
     WHERE r1.f1 > r2.f1
     ORDER BY r1.f1, r2.f1;
  
  -- Test multiplication and division with intervals.
  -- Floating point arithmetic rounding errors can lead to unexpected results,
  -- though the code attempts to do the right thing and round up to days and
  -- minutes to avoid results such as '3 days 24:00 hours' or '14:20:60'.
  -- Note that it is expected for some day components to be greater than 29 and
  -- some time components be greater than 23:59:59 due to how intervals are
  -- stored internally.
  
  CREATE TABLE INTERVAL_MULDIV_TBL (span interval);
  COPY INTERVAL_MULDIV_TBL FROM STDIN;
  41 mon 12 days 360:00
  -41 mon -12 days +360:00
  -12 days
  9 mon -27 days 12:34:56
  -3 years 482 days 76:54:32.189
  4 mon
  14 mon
  999 mon 999 days
  \.
  
  SELECT span * 0.3 AS product
  FROM INTERVAL_MULDIV_TBL ORDER BY span;
  
  SELECT span * 8.2 AS product
  FROM INTERVAL_MULDIV_TBL ORDER BY span;
  
  SELECT span / 10 AS quotient
  FROM INTERVAL_MULDIV_TBL ORDER BY span;
  
  SELECT span / 100 AS quotient
  FROM INTERVAL_MULDIV_TBL ORDER BY span;
  
  DROP TABLE INTERVAL_MULDIV_TBL;
  
  SET DATESTYLE = 'postgres';
  SET IntervalStyle to postgres_verbose;
  
  -- SELECT '' AS ten, * FROM INTERVAL_TBL ORDER BY f1;
  
  -- test avg(interval), which is somewhat fragile since people have been
  -- known to change the allowed input syntax for type interval without
  -- updating pg_aggregate.agginitval
  
  -- select avg(f1) from interval_tbl;
  
  -- test long interval input
  select '4 millenniums 5 centuries 4 decades 1 year 4 months 4 days 17 minutes 31 seconds'::interval;
  
  -- test long interval output
  -- Note: the actual maximum length of the interval output is longer,
  -- but we need the test to work for both integer and floating-point
  -- timestamps.
  select '100000000y 10mon -1000000000d -100000h -10min -10.000001s ago'::interval;
  
  -- test justify_hours() and justify_days()
  
  SELECT justify_hours(interval '6 months 3 days 52 hours 3 minutes 2 seconds') as "6 mons 5 days 4 hours 3 mins 2 seconds";
  SELECT justify_days(interval '6 months 36 days 5 hours 4 minutes 3 seconds') as "7 mons 6 days 5 hours 4 mins 3 seconds";
  
  -- test justify_interval()
  
  SELECT justify_interval(interval '1 month -1 hour') as "1 month -1 hour";
  
  -- test fractional second input, and detection of duplicate units
  SET DATESTYLE = 'ISO';
  SET IntervalStyle TO postgres;
  
  SELECT '1 millisecond'::interval, '1 microsecond'::interval,
         '500 seconds 99 milliseconds 51 microseconds'::interval;
  SELECT '3 days 5 milliseconds'::interval;
  
  SELECT '1 second 2 seconds'::interval;              -- error
  SELECT '10 milliseconds 20 milliseconds'::interval; -- error
  SELECT '5.5 seconds 3 milliseconds'::interval;      -- error
  SELECT '1:20:05 5 microseconds'::interval;          -- error
  SELECT '1 day 1 day'::interval;                     -- error
  SELECT interval '1-2';  -- SQL year-month literal
  SELECT interval '999' second;  -- oversize leading field is ok
  SELECT interval '999' minute;
  SELECT interval '999' hour;
  SELECT interval '999' day;
  SELECT interval '999' month;
  
  -- test SQL-spec syntaxes for restricted field sets
  SELECT interval '1' year;
  SELECT interval '2' month;
  SELECT interval '3' day;
  SELECT interval '4' hour;
  SELECT interval '5' minute;
  SELECT interval '6' second;
  SELECT interval '1' year to month;
  SELECT interval '1-2' year to month;
  SELECT interval '1 2' day to hour;
  SELECT interval '1 2:03' day to hour;
  SELECT interval '1 2:03:04' day to hour;
  SELECT interval '1 2' day to minute;
  SELECT interval '1 2:03' day to minute;
  SELECT interval '1 2:03:04' day to minute;
  SELECT interval '1 2' day to second;
  SELECT interval '1 2:03' day to second;
  SELECT interval '1 2:03:04' day to second;
  SELECT interval '1 2' hour to minute;
  SELECT interval '1 2:03' hour to minute;
  SELECT interval '1 2:03:04' hour to minute;
  SELECT interval '1 2' hour to second;
  SELECT interval '1 2:03' hour to second;
  SELECT interval '1 2:03:04' hour to second;
  SELECT interval '1 2' minute to second;
  SELECT interval '1 2:03' minute to second;
  SELECT interval '1 2:03:04' minute to second;
  SELECT interval '1 +2:03' minute to second;
  SELECT interval '1 +2:03:04' minute to second;
  SELECT interval '1 -2:03' minute to second;
  SELECT interval '1 -2:03:04' minute to second;
  SELECT interval '123 11' day to hour; -- ok
  SELECT interval '123 11' day; -- not ok
  SELECT interval '123 11'; -- not ok, too ambiguous
  SELECT interval '123 2:03 -2:04'; -- not ok, redundant hh:mm fields
  
  -- test syntaxes for restricted precision
  SELECT interval(0) '1 day 01:23:45.6789';
  SELECT interval(2) '1 day 01:23:45.6789';
  SELECT interval '12:34.5678' minute to second(2);  -- per SQL spec
  SELECT interval '1.234' second;
  SELECT interval '1.234' second(2);
  SELECT interval '1 2.345' day to second(2);
  SELECT interval '1 2:03' day to second(2);
  SELECT interval '1 2:03.4567' day to second(2);
  SELECT interval '1 2:03:04.5678' day to second(2);
  SELECT interval '1 2.345' hour to second(2);
  SELECT interval '1 2:03.45678' hour to second(2);
  SELECT interval '1 2:03:04.5678' hour to second(2);
  SELECT interval '1 2.3456' minute to second(2);
  SELECT interval '1 2:03.5678' minute to second(2);
  SELECT interval '1 2:03:04.5678' minute to second(2);
  
  -- test casting to restricted precision (bug #14479)
  -- SELECT f1, f1::INTERVAL DAY TO MINUTE AS "minutes",
  --   (f1 + INTERVAL '1 month')::INTERVAL MONTH::INTERVAL YEAR AS "years"
  --   FROM interval_tbl ORDER BY f1;
  
  -- test inputting and outputting SQL standard interval literals
  SET IntervalStyle TO sql_standard;
  SELECT  interval '0'                       AS "zero",
          interval '1-2' year to month       AS "year-month",
          interval '1 2:03:04' day to second AS "day-time",
          - interval '1-2'                   AS "negative year-month",
          - interval '1 2:03:04'             AS "negative day-time";
  
  -- test input of some not-quite-standard interval values in the sql style
  SET IntervalStyle TO postgres;
  SELECT  interval '+1 -1:00:00',
          interval '-1 +1:00:00',
          interval '+1-2 -3 +4:05:06.789',
          interval '-1-2 +3 -4:05:06.789';
  
  -- test output of couple non-standard interval values in the sql style
  SET IntervalStyle TO sql_standard;
  SELECT  interval '1 day -1 hours',
          interval '-1 days +1 hours',
          interval '1 years 2 months -3 days 4 hours 5 minutes 6.789 seconds',
          - interval '1 years 2 months -3 days 4 hours 5 minutes 6.789 seconds';
  
  -- test outputting iso8601 intervals
  SET IntervalStyle to iso_8601;
  select  interval '0'                                AS "zero",
          interval '1-2'                              AS "a year 2 months",
          interval '1 2:03:04'                        AS "a bit over a day",
          interval '2:03:04.45679'                    AS "a bit over 2 hours",
          (interval '1-2' + interval '3 4:05:06.7')   AS "all fields",
          (interval '1-2' - interval '3 4:05:06.7')   AS "mixed sign",
          (- interval '1-2' + interval '3 4:05:06.7') AS "negative";
  
  -- test inputting ISO 8601 4.4.2.1 "Format With Time Unit Designators"
  SET IntervalStyle to sql_standard;
  select  interval 'P0Y'                    AS "zero",
          interval 'P1Y2M'                  AS "a year 2 months",
          interval 'P1W'                    AS "a week",
          interval 'P1DT2H3M4S'             AS "a bit over a day",
          interval 'P1Y2M3DT4H5M6.7S'       AS "all fields",
          interval 'P-1Y-2M-3DT-4H-5M-6.7S' AS "negative",
          interval 'PT-0.1S'                AS "fractional second";
  
  -- test inputting ISO 8601 4.4.2.2 "Alternative Format"
  SET IntervalStyle to postgres;
  select  interval 'P00021015T103020'       AS "ISO8601 Basic Format",
          interval 'P0002-10-15T10:30:20'   AS "ISO8601 Extended Format";
  
  -- Make sure optional ISO8601 alternative format fields are optional.
  select  interval 'P0002'                  AS "year only",
          interval 'P0002-10'               AS "year month",
          interval 'P0002-10-15'            AS "year month day",
          interval 'P0002T1S'               AS "year only plus time",
          interval 'P0002-10T1S'            AS "year month plus time",
          interval 'P0002-10-15T1S'         AS "year month day plus time",
          interval 'PT10'                   AS "hour only",
          interval 'PT10:30'                AS "hour minute";
  
  -- test a couple rounding cases that changed since 8.3 w/ HAVE_INT64_TIMESTAMP.
  SET IntervalStyle to postgres_verbose;
  select interval '-10 mons -3 days +03:55:06.70';
  select interval '1 year 2 mons 3 days 04:05:06.699999';
  select interval '0:0:0.7', interval '@ 0.70 secs', interval '0.7 seconds';
  
  -- check that '30 days' equals '1 month' according to the hash function
  select '30 days'::interval = '1 month'::interval as t;
  select interval_hash('30 days'::interval) = interval_hash('1 month'::interval) as t;
  
  -- numeric constructor
  select make_interval(years := 2);
  select make_interval(years := 1, months := 6);
  select make_interval(years := 1, months := -1, weeks := 5, days := -7, hours := 25, mins := -180);
  
  select make_interval() = make_interval(years := 0, months := 0, weeks := 0, days := 0, mins := 0, secs := 0.0);
  select make_interval(hours := -2, mins := -10, secs := -25.3);
  
  select make_interval(years := 'inf'::float::int);
  select make_interval(months := 'NaN'::float::int);
  select make_interval(secs := 'inf');
  select make_interval(secs := 'NaN');
  select make_interval(secs := 7e12);
  