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72b9d75a84
SQL function toTimezone() converts a Date or DateTime into another timezone. The problem is that the timezone is part of the Date / DateTime type but not part of the internal representation (value). This led to the fact that toTimeZone() wqith non-const timezones produced wrong and misleading results until #48471 (shipped with v23.4) enforced a const timezone. Unfortunately, this PR also broke existing table definitions with non-const timezones, e.g. in ALIAS expressions. So while #48471 addressed the issue appropriately, it is really backwards-incompatible. This PR adds a setting to toggle the behavior and makes it also part of the compatibility profile.
34 lines
1.4 KiB
C++
34 lines
1.4 KiB
C++
#pragma once
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#include <string>
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#include <Core/ColumnNumbers.h>
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#include <Core/ColumnsWithTypeAndName.h>
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class DateLUTImpl;
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namespace DB
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{
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class Block;
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std::string extractTimeZoneNameFromColumn(const IColumn * column, const String & column_name);
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/// Determine working timezone either from optional argument with time zone name or from time zone in DateTime type of argument.
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/// Returns empty string if default time zone should be used.
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///
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/// Parameter allow_nonconst_timezone_arguments toggles if non-const timezone function arguments are accepted (legacy behavior) or not. The
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/// problem with the old behavior is that the timezone is part of the type, and not part of the value. This lead to confusion and unexpected
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/// results.
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/// - For new functions, set allow_nonconst_timezone_arguments = false.
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/// - For existing functions
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/// - which disallow non-const timezone arguments anyways (e.g. getArgumentsThatAreAlwaysConstant()), set allow_nonconst_timezone_arguments = false,
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/// - which allow non-const timezone arguments, set allow_nonconst_timezone_arguments according to the corresponding setting.
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std::string extractTimeZoneNameFromFunctionArguments(
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const ColumnsWithTypeAndName & arguments, size_t time_zone_arg_num, size_t datetime_arg_num, bool allow_nonconst_timezone_arguments);
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const DateLUTImpl & extractTimeZoneFromFunctionArguments(
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const ColumnsWithTypeAndName & arguments, size_t time_zone_arg_num, size_t datetime_arg_num);
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}
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