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parse_tree_nodes.cc
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/* Copyright (c) 2013, 2024, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
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, version 2.0, 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 St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "sql/parse_tree_nodes.h"
#include <algorithm>
#include <cstring>
#include <limits>
#include <utility>
#include <vector>
#include "field_types.h"
#include "m_ctype.h"
#include "m_string.h"
#include "mem_root_deque.h"
#include "my_alloc.h"
#include "my_dbug.h"
#include "mysql/mysql_lex_string.h"
#include "mysql/udf_registration_types.h"
#include "mysql_com.h"
#include "scope_guard.h"
#include "sql/auth/auth_acls.h"
#include "sql/auth/sql_security_ctx.h"
#include "sql/create_field.h"
#include "sql/dd/info_schema/show.h" // build_show_...
#include "sql/dd/types/abstract_table.h" // dd::enum_table_type::BASE_TABLE
#include "sql/dd/types/column.h"
#include "sql/derror.h" // ER_THD
#include "sql/field.h"
#include "sql/gis/srid.h"
#include "sql/intrusive_list_iterator.h"
#include "sql/item.h"
#include "sql/item_cmpfunc.h"
#include "sql/item_func.h"
#include "sql/item_timefunc.h"
#include "sql/key_spec.h"
#include "sql/mdl.h"
#include "sql/mysqld.h" // global_system_variables
#include "sql/opt_explain_json.h" // Explain_format_JSON
#include "sql/opt_explain_traditional.h" // Explain_format_traditional
#include "sql/parse_location.h"
#include "sql/parse_tree_column_attrs.h" // PT_field_def_base
#include "sql/parse_tree_hints.h"
#include "sql/parse_tree_partitions.h" // PT_partition
#include "sql/parse_tree_window.h" // PT_window
#include "sql/parser_yystype.h"
#include "sql/query_options.h"
#include "sql/query_result.h"
#include "sql/query_term.h"
#include "sql/sp.h" // sp_add_used_routine
#include "sql/sp_head.h"
#include "sql/sp_instr.h" // sp_instr_set
#include "sql/sp_pcontext.h"
#include "sql/sql_base.h" // find_temporary_table
#include "sql/sql_call.h" // Sql_cmd_call...
#include "sql/sql_class.h"
#include "sql/sql_cmd.h"
#include "sql/sql_cmd_ddl_table.h"
#include "sql/sql_component.h" // Sql_cmd_component
#include "sql/sql_const.h"
#include "sql/sql_data_change.h"
#include "sql/sql_delete.h" // Sql_cmd_delete...
#include "sql/sql_do.h" // Sql_cmd_do...
#include "sql/sql_error.h"
#include "sql/sql_insert.h" // Sql_cmd_insert...
#include "sql/sql_parse.h"
#include "sql/sql_select.h" // Sql_cmd_select...
#include "sql/sql_show.h" // Sql_cmd_show...
#include "sql/sql_show_processlist.h"
#include "sql/sql_show_status.h" // build_show_session_status, ...
#include "sql/sql_update.h" // Sql_cmd_update...
#include "sql/system_variables.h"
#include "sql/table_function.h"
#include "sql/thr_malloc.h"
#include "sql/trigger_def.h"
#include "sql/window.h" // Window
#include "sql_string.h"
#include "template_utils.h"
static constexpr const size_t MAX_SYS_VAR_LENGTH{32};
namespace {
template <typename Context, typename Node>
bool contextualize_safe(Context *pc, Node node) {
if (node == nullptr) return false;
return node->contextualize(pc);
}
template <typename Context>
bool contextualize_safe(Context *pc, mem_root_deque<Item *> *list) {
if (list == nullptr) return false;
for (Item *&item : *list) {
if (item->itemize(pc, &item)) return true;
}
return false;
}
/**
Convenience function that calls Parse_tree_node::contextualize() on each of
the nodes that are non-NULL, stopping when a call returns true.
*/
template <typename Context, typename Node, typename... Nodes>
bool contextualize_safe(Context *pc, Node node, Nodes... nodes) {
return contextualize_safe(pc, node) || contextualize_safe(pc, nodes...);
}
/**
Convenience function that calls Item::itemize() on the item if it's
non-NULL.
*/
bool itemize_safe(Parse_context *pc, Item **item) {
if (*item == nullptr) return false;
return (*item)->itemize(pc, item);
}
} // namespace
Table_ddl_parse_context::Table_ddl_parse_context(THD *thd_arg,
Query_block *select_arg,
Alter_info *alter_info)
: Parse_context(thd_arg, select_arg),
create_info(thd_arg->lex->create_info),
alter_info(alter_info),
key_create_info(&thd_arg->lex->key_create_info) {}
PT_joined_table *PT_table_reference::add_cross_join(PT_cross_join *cj) {
cj->add_rhs(this);
return cj;
}
bool PT_joined_table::contextualize_tabs(Parse_context *pc) {
if (m_left_table_ref != nullptr) return false; // already done
bool was_right_join = m_type & JTT_RIGHT;
// rewrite to LEFT JOIN
if (was_right_join) {
m_type =
static_cast<PT_joined_table_type>((m_type & ~JTT_RIGHT) | JTT_LEFT);
std::swap(m_left_pt_table, m_right_pt_table);
}
if (m_left_pt_table->contextualize(pc) || m_right_pt_table->contextualize(pc))
return true;
m_left_table_ref = m_left_pt_table->m_table_ref;
m_right_table_ref = m_right_pt_table->m_table_ref;
if (m_left_table_ref == nullptr || m_right_table_ref == nullptr) {
error(pc, m_join_pos);
return true;
}
if (m_type & JTT_LEFT) {
m_right_table_ref->outer_join = true;
if (was_right_join) {
m_right_table_ref->join_order_swapped = true;
m_right_table_ref->query_block->set_right_joins();
}
}
return false;
}
bool PT_option_value_no_option_type_charset::contextualize(Parse_context *pc) {
if (super::contextualize(pc)) return true;
THD *thd = pc->thd;
LEX *lex = thd->lex;
int flags = opt_charset ? 0 : set_var_collation_client::SET_CS_DEFAULT;
const CHARSET_INFO *cs2;
cs2 =
opt_charset ? opt_charset : global_system_variables.character_set_client;
set_var_collation_client *var;
var = new (thd->mem_root) set_var_collation_client(
flags, cs2, thd->variables.collation_database, cs2);
if (var == nullptr) return true;
lex->var_list.push_back(var);
return false;
}
bool PT_option_value_no_option_type_names::contextualize(Parse_context *pc) {
if (super::contextualize(pc)) return true;
THD *thd = pc->thd;
LEX *lex = thd->lex;
sp_pcontext *pctx = lex->get_sp_current_parsing_ctx();
LEX_CSTRING names = {STRING_WITH_LEN("names")};
if (pctx && pctx->find_variable(names.str, names.length, false))
my_error(ER_SP_BAD_VAR_SHADOW, MYF(0), names.str);
else
error(pc, pos);
return true; // always fails with an error
}
bool PT_set_names::contextualize(Parse_context *pc) {
if (super::contextualize(pc)) return true;
THD *thd = pc->thd;
LEX *lex = thd->lex;
const CHARSET_INFO *cs2;
const CHARSET_INFO *cs3;
int flags = set_var_collation_client::SET_CS_NAMES |
(opt_charset ? 0 : set_var_collation_client::SET_CS_DEFAULT) |
(opt_collation ? set_var_collation_client::SET_CS_COLLATE : 0);
cs2 =
opt_charset ? opt_charset : global_system_variables.character_set_client;
if (opt_collation != nullptr) {
if (!my_charset_same(cs2, opt_collation)) {
my_error(ER_COLLATION_CHARSET_MISMATCH, MYF(0),
opt_collation->m_coll_name, cs2->csname);
return true;
}
cs3 = opt_collation;
} else {
if (cs2 == &my_charset_utf8mb4_0900_ai_ci &&
cs2 != thd->variables.default_collation_for_utf8mb4)
cs3 = thd->variables.default_collation_for_utf8mb4;
else
cs3 = cs2;
}
set_var_collation_client *var;
var = new (thd->mem_root) set_var_collation_client(flags, cs3, cs3, cs3);
if (var == nullptr) return true;
lex->var_list.push_back(var);
return false;
}
bool PT_group::contextualize(Parse_context *pc) {
if (super::contextualize(pc)) return true;
Query_block *select = pc->select;
select->parsing_place = CTX_GROUP_BY;
if (group_list->contextualize(pc)) return true;
assert(select == pc->select);
select->group_list = group_list->value;
// group by does not have to provide ordering
ORDER *group = select->group_list.first;
for (; group; group = group->next) group->direction = ORDER_NOT_RELEVANT;
// Ensure we're resetting parsing place of the right select
assert(select->parsing_place == CTX_GROUP_BY);
select->parsing_place = CTX_NONE;
switch (olap) {
case UNSPECIFIED_OLAP_TYPE:
break;
case ROLLUP_TYPE:
if (select->linkage == GLOBAL_OPTIONS_TYPE) {
my_error(ER_WRONG_USAGE, MYF(0), "WITH ROLLUP",
"global union parameters");
return true;
}
select->olap = ROLLUP_TYPE;
break;
default:
assert(!"unexpected OLAP type!");
}
return false;
}
bool PT_order::contextualize(Parse_context *pc) {
if (super::contextualize(pc)) return true;
pc->select->parsing_place = CTX_ORDER_BY;
pc->thd->where = "global ORDER clause";
if (order_list->contextualize(pc)) return true;
pc->select->order_list = order_list->value;
// Reset parsing place only for ORDER BY
if (pc->select->parsing_place == CTX_ORDER_BY)
pc->select->parsing_place = CTX_NONE;
pc->thd->where = THD::DEFAULT_WHERE;
return false;
}
bool PT_order_expr::contextualize(Parse_context *pc) {
return super::contextualize(pc) || item_initial->itemize(pc, &item_initial);
}
/**
Recognize the transition variable syntax: { OLD | NEW } "." ...
@param pc Parse context
@param opt_prefix Optional prefix to examine or empty LEX_CSTRING
@param prefix "OLD" or "NEW" to compare with
@returns true if the OLD transition variable syntax, otherwise false
*/
static bool is_transition_variable_prefix(const Parse_context &pc,
const LEX_CSTRING &opt_prefix,
const char *prefix) {
assert(strcmp(prefix, "OLD") == 0 || strcmp(prefix, "NEW") == 0);
sp_head *const sp = pc.thd->lex->sphead;
return opt_prefix.str != nullptr && sp != nullptr &&
sp->m_type == enum_sp_type::TRIGGER &&
my_strcasecmp(system_charset_info, opt_prefix.str, prefix) == 0;
}
static bool is_old_transition_variable_prefix(const Parse_context &pc,
const LEX_CSTRING &opt_prefix) {
return is_transition_variable_prefix(pc, opt_prefix, "OLD");
}
static bool is_new_transition_variable_prefix(const Parse_context &pc,
const LEX_CSTRING &opt_prefix) {
return is_transition_variable_prefix(pc, opt_prefix, "NEW");
}
/**
Recognize any of transition variable syntax: { NEW | OLD } "." ...
@param pc Parse context
@param opt_prefix Optional prefix or empty LEX_CSTRING
@returns true if the transition variable syntax, otherwise false
*/
static bool is_any_transition_variable_prefix(const Parse_context &pc,
const LEX_CSTRING &opt_prefix) {
return is_old_transition_variable_prefix(pc, opt_prefix) ||
is_new_transition_variable_prefix(pc, opt_prefix);
}
/**
Try to resolve a name as SP formal parameter or local variable
@note Doesn't output error messages on failure.
@param pc Parse context
@param name Name of probable SP variable
@returns pointer to SP formal parameter/local variable object on success,
otherwise nullptr
*/
static sp_variable *find_sp_variable(const Parse_context &pc,
const LEX_CSTRING &name) {
const sp_pcontext *pctx = pc.thd->lex->get_sp_current_parsing_ctx();
return pctx ? pctx->find_variable(name.str, name.length, false) : nullptr;
}
/**
Helper action for a SET statement.
Used to SET a field of NEW row.
@param pc the parse context
@param trigger_field_name the NEW-row field name
@param expr_item the value expression to be assigned
@param expr_pos the value expression query
@return error status (true if error, false otherwise).
*/
static bool set_trigger_new_row(Parse_context *pc,
LEX_CSTRING trigger_field_name, Item *expr_item,
const POS &expr_pos) {
THD *thd = pc->thd;
LEX *lex = thd->lex;
sp_head *sp = lex->sphead;
assert(expr_item != nullptr);
if (sp->m_trg_chistics.event == TRG_EVENT_DELETE) {
my_error(ER_TRG_NO_SUCH_ROW_IN_TRG, MYF(0), "NEW", "on DELETE");
return true;
}
if (sp->m_trg_chistics.action_time == TRG_ACTION_AFTER) {
my_error(ER_TRG_CANT_CHANGE_ROW, MYF(0), "NEW", "after ");
return true;
}
LEX_CSTRING expr_query{};
if (lex->is_metadata_used()) {
expr_query = make_string(thd, expr_pos.raw.start, expr_pos.raw.end);
if (expr_query.str == nullptr) return true; // OOM
}
assert(sp->m_trg_chistics.action_time == TRG_ACTION_BEFORE &&
(sp->m_trg_chistics.event == TRG_EVENT_INSERT ||
sp->m_trg_chistics.event == TRG_EVENT_UPDATE));
Item_trigger_field *trg_fld = new (pc->mem_root) Item_trigger_field(
POS(), TRG_NEW_ROW, trigger_field_name.str, UPDATE_ACL, false);
if (trg_fld == nullptr || trg_fld->itemize(pc, (Item **)&trg_fld))
return true;
assert(trg_fld->type() == Item::TRIGGER_FIELD_ITEM);
auto *sp_instr = new (pc->mem_root)
sp_instr_set_trigger_field(sp->instructions(), lex, trigger_field_name,
trg_fld, expr_item, expr_query);
if (sp_instr == nullptr) return true; // OM
/*
Add this item to list of all Item_trigger_field objects in trigger.
*/
sp->m_cur_instr_trig_field_items.link_in_list(trg_fld,
&trg_fld->next_trg_field);
return sp->add_instr(thd, sp_instr);
}
/**
Helper action for a SET statement.
Used to push a system variable into the assignment list.
In stored routines detects "SET AUTOCOMMIT" and reject "SET GTID..." stuff.
@param thd the current thread
@param prefix left hand side of a qualified name (if any)
or nullptr string
@param suffix the right hand side of a qualified name (if any)
or a whole unqualified name
@param var_type the scope of the variable
@param val the value being assigned to the variable
@return true if error, false otherwise.
*/
static bool add_system_variable_assignment(THD *thd, LEX_CSTRING prefix,
LEX_CSTRING suffix,
enum enum_var_type var_type,
Item *val) {
System_variable_tracker var_tracker = System_variable_tracker::make_tracker(
to_string_view(prefix), to_string_view(suffix));
if (var_tracker.access_system_variable(thd)) {
return true;
}
LEX *lex = thd->lex;
sp_head *sp = lex->sphead;
sp_pcontext *pctx = lex->get_sp_current_parsing_ctx();
/* No AUTOCOMMIT from a stored function or trigger. */
if (pctx != nullptr && var_tracker.eq_static_sys_var(Sys_autocommit_ptr))
sp->m_flags |= sp_head::HAS_SET_AUTOCOMMIT_STMT;
if (lex->uses_stored_routines() &&
(var_tracker.eq_static_sys_var(Sys_gtid_next_ptr) ||
#ifdef HAVE_GTID_NEXT_LIST
var_tracker.eq_static_sys_var(Sys_gtid_next_list_ptr) ||
#endif
var_tracker.eq_static_sys_var(Sys_gtid_purged_ptr))) {
my_error(ER_SET_STATEMENT_CANNOT_INVOKE_FUNCTION, MYF(0),
var_tracker.get_var_name());
return true;
}
/*
If the set value is a field, change it to a string to allow things like
SET table_type=MYISAM;
*/
if (val && val->type() == Item::FIELD_ITEM) {
Item_field *item_field = down_cast<Item_field *>(val);
if (item_field->table_name != nullptr) {
// Reject a dot-separated identifier as the RHS of:
// SET <variable_name> = <table_name>.<field_name>
my_error(ER_WRONG_TYPE_FOR_VAR, MYF(0), var_tracker.get_var_name());
return true;
}
assert(item_field->field_name != nullptr);
val =
new Item_string(item_field->field_name, strlen(item_field->field_name),
system_charset_info); // names are utf8
if (val == nullptr) return true; // OOM
}
set_var *var = new (thd->mem_root) set_var(var_type, var_tracker, val);
if (var == nullptr) return true;
return lex->var_list.push_back(var);
}
bool PT_set_variable::contextualize(Parse_context *pc) {
if (super::contextualize(pc) || itemize_safe(pc, &m_opt_expr)) {
return true;
}
const bool is_1d_name = m_opt_prefix.str == nullptr;
/*
1. Reject `SET OLD.<name>` in triggers:
*/
if (is_old_transition_variable_prefix(*pc, m_opt_prefix)) {
my_error(ER_TRG_CANT_CHANGE_ROW, MYF(0), "OLD", "");
return true;
}
/*
2. Process NEW.<name> in triggers:
*/
if (is_new_transition_variable_prefix(*pc, m_opt_prefix)) {
if (m_opt_expr == nullptr) {
error(pc, m_expr_pos); // Reject the syntax: SET NEW.<column> = DEFAULT
return true;
}
if (set_trigger_new_row(pc, m_name, m_opt_expr, m_expr_pos)) return true;
return false;
}
/*
3. Process SP local variable assignment:
*/
THD *const thd = pc->thd;
LEX *const lex = thd->lex;
if (is_1d_name) {
// Remove deprecation warning when FULL is used as keyword.
if (thd->get_stmt_da()->has_sql_condition(ER_WARN_DEPRECATED_IDENT)) {
thd->get_stmt_da()->reset_condition_info(thd);
}
sp_variable *spv = find_sp_variable(*pc, m_name);
if (spv != nullptr) {
if (m_opt_expr == nullptr) {
error(pc,
m_expr_pos); // Reject the syntax: SET <sp var name> = DEFAULT
return true;
}
LEX_CSTRING expr_query{};
if (lex->is_metadata_used()) {
expr_query = make_string(thd, m_expr_pos.raw.start, m_expr_pos.raw.end);
if (expr_query.str == nullptr) return true; // OOM
}
/*
NOTE: every SET-expression has its own LEX-object, even if it is
a multiple SET-statement, like:
SET spv1 = expr1, spv2 = expr2, ...
Every SET-expression has its own sp_instr_set. Thus, the
instruction owns the LEX-object, i.e. the instruction is
responsible for destruction of the LEX-object.
*/
sp_head *const sp = lex->sphead;
auto *sp_instr = new (thd->mem_root) sp_instr_set(
sp->instructions(), lex, spv->offset, m_opt_expr, expr_query,
true); // The instruction owns its lex.
return sp_instr == nullptr || sp->add_instr(thd, sp_instr);
}
}
/*
4. Process assignment of a system variable, including:
* Multiple Key Cache variables
* plugin variables
* component variables
*/
return add_system_variable_assignment(thd, m_opt_prefix, m_name,
lex->option_type, m_opt_expr);
}
bool PT_option_value_no_option_type_password_for::contextualize(
Parse_context *pc) {
if (super::contextualize(pc)) return true;
THD *thd = pc->thd;
LEX *lex = thd->lex;
set_var_password *var;
lex->contains_plaintext_password = true;
/*
In case of anonymous user, user->user is set to empty string with
length 0. But there might be case when user->user.str could be NULL.
For Ex: "set password for current_user() = password('xyz');".
In this case, set user information as of the current user.
*/
if (!user->user.str) {
LEX_CSTRING sctx_priv_user = thd->security_context()->priv_user();
assert(sctx_priv_user.str);
user->user.str = sctx_priv_user.str;
user->user.length = sctx_priv_user.length;
}
if (!user->host.str) {
LEX_CSTRING sctx_priv_host = thd->security_context()->priv_host();
assert(sctx_priv_host.str);
user->host.str = sctx_priv_host.str;
user->host.length = sctx_priv_host.length;
}
// Current password is specified through the REPLACE clause hence set the flag
if (current_password != nullptr) user->uses_replace_clause = true;
if (random_password_generator) password = nullptr;
var = new (thd->mem_root) set_var_password(
user, const_cast<char *>(password), const_cast<char *>(current_password),
retain_current_password, random_password_generator);
if (var == nullptr || lex->var_list.push_back(var)) {
return true; // Out of memory
}
lex->sql_command = SQLCOM_SET_PASSWORD;
if (lex->sphead) lex->sphead->m_flags |= sp_head::HAS_SET_AUTOCOMMIT_STMT;
if (sp_create_assignment_instr(pc->thd, expr_pos.raw.end)) return true;
return false;
}
bool PT_option_value_no_option_type_password::contextualize(Parse_context *pc) {
if (super::contextualize(pc)) return true;
THD *thd = pc->thd;
LEX *lex = thd->lex;
sp_head *sp = lex->sphead;
sp_pcontext *pctx = lex->get_sp_current_parsing_ctx();
LEX_CSTRING pw = {STRING_WITH_LEN("password")};
lex->contains_plaintext_password = true;
if (pctx && pctx->find_variable(pw.str, pw.length, false)) {
my_error(ER_SP_BAD_VAR_SHADOW, MYF(0), pw.str);
return true;
}
LEX_CSTRING sctx_user = thd->security_context()->user();
LEX_CSTRING sctx_priv_host = thd->security_context()->priv_host();
assert(sctx_priv_host.str);
LEX_USER *user = LEX_USER::alloc(thd, (LEX_STRING *)&sctx_user,
(LEX_STRING *)&sctx_priv_host);
if (!user) return true;
if (random_password_generator) password = nullptr;
set_var_password *var = new (thd->mem_root) set_var_password(
user, const_cast<char *>(password), const_cast<char *>(current_password),
retain_current_password, random_password_generator);
if (var == nullptr || lex->var_list.push_back(var)) {
return true; // Out of Memory
}
lex->sql_command = SQLCOM_SET_PASSWORD;
if (sp) sp->m_flags |= sp_head::HAS_SET_AUTOCOMMIT_STMT;
if (sp_create_assignment_instr(pc->thd, expr_pos.raw.end)) return true;
return false;
}
PT_key_part_specification::PT_key_part_specification(Item *expression,
enum_order order)
: m_expression(expression), m_order(order) {}
PT_key_part_specification::PT_key_part_specification(
const LEX_CSTRING &column_name, enum_order order, int prefix_length)
: m_expression(nullptr),
m_order(order),
m_column_name(column_name),
m_prefix_length(prefix_length) {}
bool PT_key_part_specification::contextualize(Parse_context *pc) {
return super::contextualize(pc) || itemize_safe(pc, &m_expression);
}
bool PT_select_sp_var::contextualize(Parse_context *pc) {
if (super::contextualize(pc)) return true;
LEX *lex = pc->thd->lex;
#ifndef NDEBUG
sp = lex->sphead;
#endif
sp_pcontext *pctx = lex->get_sp_current_parsing_ctx();
sp_variable *spv;
if (!pctx || !(spv = pctx->find_variable(name.str, name.length, false))) {
my_error(ER_SP_UNDECLARED_VAR, MYF(0), name.str);
return true;
}
offset = spv->offset;
return false;
}
Sql_cmd *PT_select_stmt::make_cmd(THD *thd) {
Parse_context pc(thd, thd->lex->current_query_block());
thd->lex->sql_command = m_sql_command;
if (m_qe->contextualize(&pc)) {
return nullptr;
}
const bool has_into_clause_inside_query_block = thd->lex->result != nullptr;
if (has_into_clause_inside_query_block && m_into != nullptr) {
my_error(ER_MULTIPLE_INTO_CLAUSES, MYF(0));
return nullptr;
}
if (contextualize_safe(&pc, m_into)) {
return nullptr;
}
if (pc.finalize_query_expression()) return nullptr;
if (m_into != nullptr && m_has_trailing_locking_clauses) {
// Example: ... INTO ... FOR UPDATE;
push_warning(thd, ER_WARN_DEPRECATED_INNER_INTO);
} else if (has_into_clause_inside_query_block &&
thd->lex->unit->is_set_operation()) {
// Example: ... UNION ... INTO ...;
if (!m_qe->has_trailing_into_clause()) {
// Example: ... UNION SELECT * INTO OUTFILE 'foo' FROM ...;
push_warning(thd, ER_WARN_DEPRECATED_INNER_INTO);
} else if (m_has_trailing_locking_clauses) {
// Example: ... UNION SELECT ... FROM ... INTO OUTFILE 'foo' FOR UPDATE;
push_warning(thd, ER_WARN_DEPRECATED_INNER_INTO);
}
}
DBUG_EXECUTE_IF("ast", Query_term *qn =
pc.select->master_query_expression()->query_term();
std::ostringstream buf; qn->debugPrint(0, buf);
DBUG_PRINT("ast", ("\n%s", buf.str().c_str())););
if (thd->lex->sql_command == SQLCOM_SELECT)
return new (thd->mem_root) Sql_cmd_select(thd->lex->result);
else // (thd->lex->sql_command == SQLCOM_DO)
return new (thd->mem_root) Sql_cmd_do(nullptr);
}
/*
Given a table in the source list, find a correspondent table in the
list of table references.
@param tbl Source table to match.
@param tables Table references list.
@remark The source table list (tables listed before the FROM clause
or tables listed in the FROM clause before the USING clause) may
contain table names or aliases that must match unambiguously one,
and only one, table in the target table list (table references list,
after FROM/USING clause).
@return Matching table, NULL if error.
*/
static Table_ref *multi_delete_table_match(Table_ref *tbl, Table_ref *tables) {
Table_ref *match = nullptr;
DBUG_TRACE;
for (Table_ref *elem = tables; elem; elem = elem->next_local) {
int cmp;
if (tbl->is_fqtn && elem->is_alias) continue; /* no match */
if (tbl->is_fqtn && elem->is_fqtn)
cmp = my_strcasecmp(table_alias_charset, tbl->table_name,
elem->table_name) ||
strcmp(tbl->db, elem->db);
else if (elem->is_alias)
cmp = my_strcasecmp(table_alias_charset, tbl->alias, elem->alias);
else
cmp = my_strcasecmp(table_alias_charset, tbl->table_name,
elem->table_name) ||
strcmp(tbl->db, elem->db);
if (cmp) continue;
if (match) {
my_error(ER_NONUNIQ_TABLE, MYF(0), elem->alias);
return nullptr;
}
match = elem;
}
if (!match)
my_error(ER_UNKNOWN_TABLE, MYF(0), tbl->table_name, "MULTI DELETE");
return match;
}
/**
Link tables in auxiliary table list of multi-delete with corresponding
elements in main table list, and set proper locks for them.
@param pc Parse context
@param delete_tables List of tables to delete from
@returns false if success, true if error
*/
static bool multi_delete_link_tables(Parse_context *pc,
SQL_I_List<Table_ref> *delete_tables) {
DBUG_TRACE;
Table_ref *tables = pc->select->get_table_list();
for (Table_ref *target_tbl = delete_tables->first; target_tbl;
target_tbl = target_tbl->next_local) {
/* All tables in aux_tables must be found in FROM PART */
Table_ref *walk = multi_delete_table_match(target_tbl, tables);
if (!walk) return true;
if (!walk->is_derived()) {
target_tbl->table_name = walk->table_name;
target_tbl->table_name_length = walk->table_name_length;
}
walk->updating = target_tbl->updating;
walk->set_lock(target_tbl->lock_descriptor());
/* We can assume that tables to be deleted from are locked for write. */
assert(walk->lock_descriptor().type >= TL_WRITE_ALLOW_WRITE);
walk->mdl_request.set_type(mdl_type_for_dml(walk->lock_descriptor().type));
target_tbl->correspondent_table = walk; // Remember corresponding table
}
return false;
}
bool PT_delete::add_table(Parse_context *pc, Table_ident *table) {
const ulong table_opts = is_multitable()
? TL_OPTION_UPDATING | TL_OPTION_ALIAS
: TL_OPTION_UPDATING;
const thr_lock_type lock_type = (opt_delete_options & DELETE_LOW_PRIORITY)
? TL_WRITE_LOW_PRIORITY
: TL_WRITE_DEFAULT;
const enum_mdl_type mdl_type = (opt_delete_options & DELETE_LOW_PRIORITY)
? MDL_SHARED_WRITE_LOW_PRIO
: MDL_SHARED_WRITE;
return !pc->select->add_table_to_list(
pc->thd, table, opt_table_alias, table_opts, lock_type, mdl_type, nullptr,
opt_use_partition, nullptr, pc);
}
Sql_cmd *PT_delete::make_cmd(THD *thd) {
LEX *const lex = thd->lex;
Query_block *const select = lex->current_query_block();
Parse_context pc(thd, select);
assert(lex->query_block == select);
lex->sql_command = is_multitable() ? SQLCOM_DELETE_MULTI : SQLCOM_DELETE;
lex->set_ignore(opt_delete_options & DELETE_IGNORE);
select->init_order();
if (opt_delete_options & DELETE_QUICK) select->add_base_options(OPTION_QUICK);
if (contextualize_safe(&pc, m_with_clause))
return nullptr; /* purecov: inspected */
if (is_multitable()) {
for (Table_ident **i = table_list.begin(); i != table_list.end(); ++i) {
if (add_table(&pc, *i)) return nullptr;
}
} else if (add_table(&pc, table_ident))
return nullptr;
if (is_multitable()) {
select->m_table_list.save_and_clear(&delete_tables);
lex->query_tables = nullptr;
lex->query_tables_last = &lex->query_tables;
} else {
select->m_table_nest.push_back(select->get_table_list());
}
Yacc_state *const yyps = &pc.thd->m_parser_state->m_yacc;
yyps->m_lock_type = TL_READ_DEFAULT;
yyps->m_mdl_type = MDL_SHARED_READ;
if (is_multitable()) {
if (contextualize_array(&pc, &join_table_list)) return nullptr;
pc.select->context.table_list =
pc.select->context.first_name_resolution_table =
pc.select->get_table_list();
}
if (opt_where_clause != nullptr &&
opt_where_clause->itemize(&pc, &opt_where_clause))
return nullptr;
select->set_where_cond(opt_where_clause);
if (opt_order_clause != nullptr && opt_order_clause->contextualize(&pc))
return nullptr;
assert(select->select_limit == nullptr);
if (opt_delete_limit_clause != nullptr) {
if (opt_delete_limit_clause->itemize(&pc, &opt_delete_limit_clause))
return nullptr;
select->select_limit = opt_delete_limit_clause;
lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_LIMIT);
}
if (is_multitable() && multi_delete_link_tables(&pc, &delete_tables))
return nullptr;
if (opt_hints != nullptr && opt_hints->contextualize(&pc)) return nullptr;
return new (thd->mem_root) Sql_cmd_delete(is_multitable(), &delete_tables);
}
Sql_cmd *PT_update::make_cmd(THD *thd) {
LEX *const lex = thd->lex;
Query_block *const select = lex->current_query_block();
Parse_context pc(thd, select);
lex->duplicates = DUP_ERROR;
lex->set_ignore(opt_ignore);
if (contextualize_safe(&pc, m_with_clause))
return nullptr; /* purecov: inspected */
if (contextualize_array(&pc, &join_table_list)) return nullptr;
select->parsing_place = CTX_UPDATE_VALUE;
if (column_list->contextualize(&pc) || value_list->contextualize(&pc)) {
return nullptr;
}
select->fields = column_list->value;
// Ensure we're resetting parsing context of the right select
assert(select->parsing_place == CTX_UPDATE_VALUE);
select->parsing_place = CTX_NONE;
const bool is_multitable = select->m_table_list.elements > 1;
lex->sql_command = is_multitable ? SQLCOM_UPDATE_MULTI : SQLCOM_UPDATE;
/*
In case of multi-update setting write lock for all tables may
be too pessimistic. We will decrease lock level if possible in
Sql_cmd_update::prepare_inner().
*/
select->set_lock_for_tables(opt_low_priority);
if (opt_where_clause != nullptr &&
opt_where_clause->itemize(&pc, &opt_where_clause)) {
return nullptr;
}
select->set_where_cond(opt_where_clause);
if (opt_order_clause != nullptr && opt_order_clause->contextualize(&pc))
return nullptr;
assert(select->select_limit == nullptr);
if (opt_limit_clause != nullptr) {
if (opt_limit_clause->itemize(&pc, &opt_limit_clause)) return nullptr;
select->select_limit = opt_limit_clause;
lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_LIMIT);
}
if (opt_hints != nullptr && opt_hints->contextualize(&pc)) return nullptr;
return new (thd->mem_root) Sql_cmd_update(is_multitable, &value_list->value);
}
bool PT_insert_values_list::contextualize(Parse_context *pc) {
if (super::contextualize(pc)) return true;
for (List_item *item_list : many_values) {
for (auto it = item_list->begin(); it != item_list->end(); ++it) {
if ((*it)->itemize(pc, &*it)) return true;
}
}
return false;
}
Sql_cmd *PT_insert::make_cmd(THD *thd) {
LEX *const lex = thd->lex;
Parse_context pc(thd, lex->current_query_block());
// Currently there are two syntaxes (old and new, respectively) for INSERT
// .. VALUES statements:
//
// - INSERT .. VALUES (), () ..
// - INSERT .. VALUES ROW(), ROW() ..
//
// The latter is a table value constructor, i.e. it has an subquery
// expression, while the former is the standard VALUES syntax. When the
// non-standard VALUES() function (primarily used in ON DUPLICATE KEY UPDATE
// update expressions) is deprecated in the future, the old syntax can be used
// as a table value constructor as well.
//
// However, until such a change is made, we convert INSERT statements with
// table value constructors into PT_insert objects that are equal to the old
// syntax, as to enforce consistency by making sure they both follow the same
// execution path.