93 lines
3.4 KiB
C++
93 lines
3.4 KiB
C++
/* Copyright (c) 2018, 2021, Alibaba and/or its affiliates. All rights reserved.
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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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL/PolarDB-X Engine hereby grant you an
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additional permission to link the program and your derivative works with the
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separately licensed software that they have included with
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MySQL/PolarDB-X Engine.
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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, version 2.0, 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 "sql/ccl/ccl_hint_parse.h"
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#include "sql/item.h"
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#include "sql/item_func.h"
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#include "sql/sql_class.h"
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#include "sql/sql_lex.h"
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namespace im {
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bool PT_hint_ccl_queue::contextualize(Parse_context *pc) {
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char buff[64];
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String str(buff, sizeof(buff), system_charset_info);
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LEX_CSTRING lex_str;
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Ccl_queue_hint *hint = nullptr;
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if (super::contextualize(pc)) return true;
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Opt_hints_global *global_hint = get_global_hints(pc);
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if (global_hint->is_specified(type())) {
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print_warn(pc->thd, ER_WARN_CONFLICTING_HINT, NULL, NULL, NULL, this);
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return false;
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}
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String *res = m_item->val_str(&str);
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lex_str = to_lex_cstring(
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strmake_root(pc->thd->mem_root, res->ptr(), res->length()));
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if (m_type == Ccl_hint_type::CCL_HINT_QUEUE_FIELD)
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hint = new (pc->thd->mem_root) Ccl_queue_field_hint(lex_str, m_item);
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else if (m_type == Ccl_hint_type::CCL_HINT_QUEUE_VALUE)
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hint = new (pc->thd->mem_root) Ccl_queue_value_hint(lex_str, m_item);
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else
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hint = nullptr;
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global_hint->set_switch(switch_on(), type(), false);
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global_hint->ccl_queue_hint = hint;
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return false;
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}
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/**
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Fill the where condition into ccl hint structure.
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@param[in] pc Parse context
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@param[in] cond Equal condition
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@param[in] left field item
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@param[in] right value item
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*/
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void fill_ccl_queue_field_cond(Parse_context *pc, Item *cond, Item *left,
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Item *right) {
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SELECT_LEX *select = pc->select;
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/* Require the condition is in WHERE clause */
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if (!select || select->parsing_place != CTX_WHERE) return;
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/*
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Requirement:
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1) Condition must be function like '=', '!=', '>', and so on;
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2) left arg item must be field;
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3) right arg item must be int or string const item;
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*/
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if (cond->type() == Item_func::FUNC_ITEM) {
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Item_func *func_cond = (Item_func *)(cond);
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Item **args = func_cond->arguments();
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if ((func_cond->argument_count() == 2) && (args[0] == left) &&
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(args[1] == right) && (left->type() == Item::FIELD_ITEM) &&
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(right->type() == Item::STRING_ITEM ||
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right->type() == Item::INT_ITEM)) {
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select->ccl_queue_field_cond_list.push_back(cond);
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}
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}
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}
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} /* namespace im */
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