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75 lines
3.6 KiB
C++
75 lines
3.6 KiB
C++
#pragma once
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#include <stddef.h>
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#include <time.h>
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#include <Core/Types.h>
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class DateLUTImpl;
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namespace DB
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{
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class ReadBuffer;
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/** https://xkcd.com/1179/
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*
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* The existence of this function is an example of bad practice
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* and contradicts our development principles.
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*
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* This function will recognize the following patterns:
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*
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* NNNNNNNNNN - 9..10 digits is a unix timestamp
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*
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* YYYYMMDDhhmmss - 14 numbers is always interpreted this way
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*
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* YYYYMMDD - 8 digits in a row
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* YYYY*MM*DD - or with any delimiter after first 4-digit year component and after month.
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*
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* DD/MM/YY
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* DD/MM/YYYY - when '/' separator is used, these are the only possible forms
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*
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* hh:mm:ss - when ':' separator is used, it is always time
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* hh:mm - it can be specified without seconds
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*
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* YYYY - 4 digits is always year
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*
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* YYYYMM - 6 digits is a year, month if year was not already read
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* hhmmss - 6 digits is a time if year was already read
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*
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* .nnnnnnn - any number of digits after point is fractional part of second, if it is not YYYY.MM.DD or DD.MM.YYYY
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*
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* T - means that time will follow
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*
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* Z - means zero UTC offset
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*
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* +hhmm
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* +hh:mm
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* +hh
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* -... - time zone offset
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*
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* single whitespace can be used as a separator
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*
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* AM/PM - AM means: subtract 12 hours if a value is 12 and PM means: add 12 hours if a value is less than 12.
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*
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* Jan/Feb/Mar/Apr/May/Jun/Jul/Aug/Sep/Oct/Nov/Dec - allowed to specify month
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* Mon/Tue/Wed/Thu/Fri/Sat/Sun - simply ignored.
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*/
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void parseDateTimeBestEffort(time_t & res, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
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bool tryParseDateTimeBestEffort(time_t & res, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
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void parseDateTimeBestEffortUS(time_t & res, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
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bool tryParseDateTimeBestEffortUS(time_t & res, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
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void parseDateTime64BestEffort(DateTime64 & res, UInt32 scale, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
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bool tryParseDateTime64BestEffort(DateTime64 & res, UInt32 scale, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
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void parseDateTime64BestEffortUS(DateTime64 & res, UInt32 scale, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
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bool tryParseDateTime64BestEffortUS(DateTime64 & res, UInt32 scale, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone);
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/// More strict version of best effort parsing. Requires day, month and year to be present, checks for allowed
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/// delimiters between date components, makes additional correctness checks. Used in schema inference if date times.
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bool tryParseDateTimeBestEffortStrict(time_t & res, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone, const char * allowed_date_delimiters);
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bool tryParseDateTimeBestEffortUSStrict(time_t & res, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone, const char * allowed_date_delimiters);
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bool tryParseDateTime64BestEffortStrict(DateTime64 & res, UInt32 scale, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone, const char * allowed_date_delimiters);
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bool tryParseDateTime64BestEffortUSStrict(DateTime64 & res, UInt32 scale, ReadBuffer & in, const DateLUTImpl & local_time_zone, const DateLUTImpl & utc_time_zone, const char * allowed_date_delimiters);
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}
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