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/*****************************************************************************
Copyright (c) 1996, 2012, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2018, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/row0types.h
Row operation global types
Created 12/27/1996 Heikki Tuuri
*******************************************************/
#ifndef row0types_h
#define row0types_h
struct plan_t;
struct upd_t;
struct upd_field_t;
struct upd_node_t;
struct del_node_t;
struct ins_node_t;
struct sel_node_t;
struct open_node_t;
struct fetch_node_t;
struct row_printf_node_t;
struct sel_buf_t;
struct undo_node_t;
struct purge_node_t;
struct row_ext_t;
/** Buffer for logging modifications during online index creation */
struct row_log_t;
/* MySQL data types */
struct TABLE;
/** Purge virtual column node information. */
struct purge_vcol_info_t
{
private:
/** Is there a possible need to evaluate virtual columns? */
bool requested;
/** Do we have to evaluate virtual columns (using mariadb_table)? */
bool used;
/** True if it is used for the first time. */
bool first_use;
/** MariaDB table opened for virtual column computation. */
TABLE* mariadb_table;
public:
/** Default constructor */
purge_vcol_info_t() :
requested(false), used(false), first_use(false),
mariadb_table(NULL)
{}
/** Reset the state. */
void reset()
{
requested = false;
used = false;
first_use = false;
mariadb_table = NULL;
}
/** Validate the virtual column information.
@return true if the mariadb table opened successfully
or doesn't try to calculate virtual column. */
bool validate() const { return !used || mariadb_table; }
/** @return the table handle for evaluating virtual columns */
TABLE* table() const { return mariadb_table; }
/** Set the table handle for evaluating virtual columns.
@param[in] table table handle */
void set_table(TABLE* table)
{
ut_ad(!table || is_first_fetch());
mariadb_table = table;
}
/** Note that virtual column information may be needed. */
void set_requested()
{
ut_ad(!used);
ut_ad(!first_use);
ut_ad(!mariadb_table);
requested = true;
}
/** @return whether the virtual column information may be needed */
bool is_requested() const { return requested; }
/** Note that the virtual column information is needed. */
void set_used()
{
ut_ad(requested);
if (first_use) {
first_use = false;
ut_ad(used);
return;
}
if (!used) {
first_use = used = true;
}
}
/** @return whether the virtual column information is needed */
bool is_used() const
{
ut_ad(!first_use || used);
ut_ad(!used || requested);
ut_ad(used || !mariadb_table);
return used;
}
/** Check whether it fetches mariadb table for the first time.
@return true if first time tries to open mariadb table. */
bool is_first_fetch() const
{
ut_ad(!first_use || used);
ut_ad(!used || requested);
ut_ad(used || !mariadb_table);
return first_use;
}
};
#endif
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