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#pragma once
#include <string>
#include <Core/ColumnNumbers.h>
#include <Core/ColumnsWithTypeAndName.h>
class DateLUTImpl;
namespace DB
{
class Block;
std::string extractTimeZoneNameFromColumn(const IColumn * column, const String & column_name);
/// Determine working timezone either from optional argument with time zone name or from time zone in DateTime type of argument.
/// Returns empty string if default time zone should be used.
///
/// Parameter allow_nonconst_timezone_arguments toggles if non-const timezone function arguments are accepted (legacy behavior) or not. The
/// 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
/// results.
/// - For new functions, set allow_nonconst_timezone_arguments = false.
/// - For existing functions
/// - which disallow non-const timezone arguments anyways (e.g. getArgumentsThatAreAlwaysConstant()), set allow_nonconst_timezone_arguments = false,
/// - which allow non-const timezone arguments, set allow_nonconst_timezone_arguments according to the corresponding setting.
std::string extractTimeZoneNameFromFunctionArguments(
const ColumnsWithTypeAndName & arguments, size_t time_zone_arg_num, size_t datetime_arg_num, bool allow_nonconst_timezone_arguments);
const DateLUTImpl & extractTimeZoneFromFunctionArguments(
const ColumnsWithTypeAndName & arguments, size_t time_zone_arg_num, size_t datetime_arg_num);
}
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