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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 Sun Microsystems
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#include "drizzled/function/time/to_days.h"
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#include "drizzled/error.h"
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#include "drizzled/temporal.h"
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* We intepret the first argument as a DateTime and then convert
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* it to a Julian Day Number and return it.
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int64_t Item_func_to_days::val_int()
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/* We return NULL from FROM_DAYS() only when supplied a NULL argument */
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if (args[0]->null_value)
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* We attempt to convert the first argument into a
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* temporal value. If the conversion is successful,
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* we know that a conversion to a Julian Day Number
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* is always possible. Upon successful conversion,
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* we return the Julian Day Number. If no conversion
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* was possible into a temporal value, we throw an
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* error and return 0, setting the null_value flag to true.
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/* Grab the first argument as a DateTime object */
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Item_result arg0_result_type= args[0]->result_type();
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switch (arg0_result_type)
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* For doubles supplied, interpret the arg as a string,
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* so intentionally fall-through here...
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* This allows us to accept double parameters like
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* 19971231235959.01 and interpret it the way MySQL does:
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* as a TIMESTAMP-like thing with a microsecond component.
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* Ugh, but need to keep backwards-compat.
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char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
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String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
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String *res= args[0]->val_str(&tmp);
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* Likely a nested function issue where the nested
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* function had bad input. We rely on the nested
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* function my_error() and simply return false here.
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if (! temporal.from_string(res->c_ptr(), res->length()))
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* Could not interpret the function argument as a temporal value,
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* so throw an error and return 0
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my_error(ER_INVALID_DATETIME_VALUE, MYF(0), res->c_ptr());
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if (temporal.from_int64_t(args[0]->val_int()))
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/* Intentionally fall-through on invalid conversion from integer */
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* Could not interpret the function argument as a temporal value,
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* so throw an error and return 0
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char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
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String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
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res= args[0]->val_str(&tmp);
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* Likely a nested function issue where the nested
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* function had bad input. We rely on the nested
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* function my_error() and simply return false here.
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my_error(ER_INVALID_DATETIME_VALUE, MYF(0), res->c_ptr());
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int64_t julian_day_number;
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temporal.to_julian_day_number(&julian_day_number);
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return julian_day_number;
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int64_t Item_func_to_days::val_int_endpoint(bool left_endp, bool *incl_endp)
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* We attempt to convert the first argument into a
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* temporal value. If the conversion is successful,
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* we know that a conversion to a Julian Day Number
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* is always possible. Depending on whether the
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* first argument is a Date, or a DateTime with no
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* time-portion, we return the Julian Day Number or
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* the appropriate end-point integer.
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/* Grab the first argument as a DateTime object */
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Item_result arg0_result_type= args[0]->result_type();
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switch (arg0_result_type)
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* For doubles supplied, interpret the arg as a string,
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* so intentionally fall-through here...
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* This allows us to accept double parameters like
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* 19971231235959.01 and interpret it the way MySQL does:
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* as a TIMESTAMP-like thing with a microsecond component.
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* Ugh, but need to keep backwards-compat.
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char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
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String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
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String *res= args[0]->val_str(&tmp);
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* Likely a nested function issue where the nested
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* function had bad input. We rely on the nested
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* function my_error() and simply return false here.
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if (! temporal.from_string(res->c_ptr(), res->length()))
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* Could not interpret the function argument as a temporal value,
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* so throw an error and return 0
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my_error(ER_INVALID_DATETIME_VALUE, MYF(0), res->c_ptr());
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if (temporal.from_int64_t(args[0]->val_int()))
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/* Intentionally fall-through on invalid conversion from integer */
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* Could not interpret the function argument as a temporal value,
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* so throw an error and return 0
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char buff[DRIZZLE_MAX_LENGTH_DATETIME_AS_STRING];
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String tmp(buff,sizeof(buff), &my_charset_utf8_bin);
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res= args[0]->val_str(&tmp);
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* Likely a nested function issue where the nested
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* function had bad input. We rely on the nested
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* function my_error() and simply return false here.
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my_error(ER_INVALID_DATETIME_VALUE, MYF(0), res->c_ptr());
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if (null_value == true)
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/* got NULL, leave the incl_endp intact */
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int64_t julian_day_number;
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temporal.to_julian_day_number(&julian_day_number);
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if (args[0]->field_type() == DRIZZLE_TYPE_DATE)
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/* TO_DAYS() is strictly monotonic for dates, leave incl_endp intact */
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return julian_day_number;
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Handle the special but practically useful case of datetime values that
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point to day bound ("strictly less" comparison stays intact):
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col < '2007-09-15 00:00:00' -> TO_DAYS(col) < TO_DAYS('2007-09-15')
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which is different from the general case ("strictly less" changes to
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col < '2007-09-15 12:34:56' -> TO_DAYS(col) <= TO_DAYS('2007-09-15')
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if (!left_endp && ! (
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|| temporal.minutes()
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|| temporal.seconds()
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|| temporal.useconds()
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|| temporal.nseconds()
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return julian_day_number;
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} /* namespace drizzled */