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2d03d330bc
The Year 1925 is a starting point because most of the timezones switched to saner (mostly 15-minutes based) offsets somewhere during 1924 or before. And that significantly simplifies implementation. 2238 is to simplify arithmetics for sanitizing LUT index access; there are less than 0x1ffff days from 1925. * Extended DateLUTImpl internal LUT to 0x1ffff items, some of which represent negative (pre-1970) time values. As a collateral benefit, Date now correctly supports dates up to 2149 (instead of 2106). * Added a new strong typedef ExtendedDayNum, which represents dates pre-1970 and post 2149. * Functions that used to return DayNum now return ExtendedDayNum. * Refactored DateLUTImpl to untie DayNum from the dual role of being a value and an index (due to negative time). Index is now a different type LUTIndex with explicit conversion functions from DatNum, time_t, and ExtendedDayNum. * Updated DateLUTImpl to properly support values close to epoch start (1970-01-01 00:00), including negative ones. * Reduced resolution of DateLUTImpl::Values::time_at_offset_change to multiple of 15-minutes to allow storing 64-bits of time_t in DateLUTImpl::Value while keeping same size. * Minor performance updates to DateLUTImpl when building month LUT by skipping non-start-of-month days. * Fixed extractTimeZoneFromFunctionArguments to work correctly with DateTime64. * New unit-tests and stateless integration tests for both DateTime and DateTime64.
44 lines
780 B
SQL
44 lines
780 B
SQL
SELECT
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n,
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toTypeName(dt64) AS dt64_typename,
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'<',
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dt64 < d,
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toDate(dt64) < d,
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dt64 < toDateTime64(d, 1, 'UTC'),
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'<=',
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dt64 <= d,
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toDate(dt64) <= d,
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dt64 <= toDateTime64(d, 1, 'UTC'),
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'=',
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dt64 = d,
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toDate(dt64) = d,
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dt64 = toDateTime64(d, 1, 'UTC'),
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'>=',
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dt64 >= d,
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toDate(dt64) >= d,
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dt64 >= toDateTime64(d, 1, 'UTC'),
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'>',
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dt64 > d,
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toDate(dt64) > d,
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dt64 > toDateTime64(d, 1, 'UTC'),
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'!=',
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dt64 != d,
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toDate(dt64) != d,
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dt64 != toDateTime64(d, 1, 'UTC')
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FROM
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(
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WITH toDateTime('2019-09-16 19:20:11') as val
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SELECT
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number - 1 as n,
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toDateTime64(val, 1, 'UTC') AS dt64,
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toDate(val, 'UTC') - n as d
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FROM system.numbers
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LIMIT 3
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)
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