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
  );
  
  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;
  
  SELECT
      '' AS nine,
      *
  FROM
      INTERVAL_TBL
  WHERE
      INTERVAL_TBL.f1 <> interval '@ 10 days';
  
  SELECT
      '' AS three,
      *
  FROM
      INTERVAL_TBL
  WHERE
      INTERVAL_TBL.f1 <= interval '@ 5 hours';
  
  SELECT
      '' AS three,
      *
  FROM
      INTERVAL_TBL
  WHERE
      INTERVAL_TBL.f1 < interval '@ 1 day';
  
  SELECT
      '' AS one,
      *
  FROM
      INTERVAL_TBL
  WHERE
      INTERVAL_TBL.f1 = interval '@ 34 years';
  
  SELECT
      '' AS five,
      *
  FROM
      INTERVAL_TBL
  WHERE
      INTERVAL_TBL.f1 >= interval '@ 1 month';
  
  SELECT
      '' AS nine,
      *
  FROM
      INTERVAL_TBL
  WHERE
      INTERVAL_TBL.f1 > interval '@ 3 seconds ago';
  
  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 TEMP 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;
  
  CREATE INDEX ON INTERVAL_TBL_OF
  USING btree (f1);
  
  SET enable_seqscan TO FALSE;
  
  EXPLAIN (
      COSTS OFF
  )
  SELECT
      f1
  FROM
      INTERVAL_TBL_OF r1
  ORDER BY
      f1;
  
  SELECT
      f1
  FROM
      INTERVAL_TBL_OF r1
  ORDER BY
      f1;
  
  RESET enable_seqscan;
  
  DROP TABLE INTERVAL_TBL_OF;
  
  -- 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
  );
  
  SELECT
      span * 0.3 AS product
  FROM
      INTERVAL_MULDIV_TBL;
  
  SELECT
      span * 8.2 AS product
  FROM
      INTERVAL_MULDIV_TBL;
  
  SELECT
      span / 10 AS quotient
  FROM
      INTERVAL_MULDIV_TBL;
  
  SELECT
      span / 100 AS quotient
  FROM
      INTERVAL_MULDIV_TBL;
  
  DROP TABLE INTERVAL_MULDIV_TBL;
  
  SET DATESTYLE = 'postgres';
  
  SET IntervalStyle TO postgres_verbose;
  
  SELECT
      '' AS ten,
      *
  FROM
      INTERVAL_TBL;
  
  -- 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;
  
  -- 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);
  
  